diff --git a/src/org/jetbrains/java/decompiler/code/ExceptionHandler.java b/src/org/jetbrains/java/decompiler/code/ExceptionHandler.java
index 5c5b659..2927294 100644
--- a/src/org/jetbrains/java/decompiler/code/ExceptionHandler.java
+++ b/src/org/jetbrains/java/decompiler/code/ExceptionHandler.java
@@ -54,10 +54,8 @@ public class ExceptionHandler {
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
-    StringBuffer buf = new StringBuffer();
-    buf.append("from: " + from + " to: " + to + " handler: " + handler + new_line_separator);
-    buf.append("from_instr: " + from_instr + " to_instr: " + to_instr + " handler_instr: " + handler_instr + new_line_separator);
-    buf.append("exceptionClass: " + exceptionClass + new_line_separator);
-    return buf.toString();
+    return "from: " + from + " to: " + to + " handler: " + handler + new_line_separator +
+           "from_instr: " + from_instr + " to_instr: " + to_instr + " handler_instr: " + handler_instr + new_line_separator +
+           "exceptionClass: " + exceptionClass + new_line_separator;
   }
 }
diff --git a/src/org/jetbrains/java/decompiler/code/InstructionSequence.java b/src/org/jetbrains/java/decompiler/code/InstructionSequence.java
index 68c2dab..709a85d 100644
--- a/src/org/jetbrains/java/decompiler/code/InstructionSequence.java
+++ b/src/org/jetbrains/java/decompiler/code/InstructionSequence.java
@@ -140,7 +140,7 @@ public int getOffset(int index) {
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
     for (int i = 0; i < collinstr.size(); i++) {
     buf.append(InterpreterUtil.getIndentString(indent));
diff --git a/src/org/jetbrains/java/decompiler/code/cfg/BasicBlock.java b/src/org/jetbrains/java/decompiler/code/cfg/BasicBlock.java
index f8bf793..61b0a63 100644
--- a/src/org/jetbrains/java/decompiler/code/cfg/BasicBlock.java
+++ b/src/org/jetbrains/java/decompiler/code/cfg/BasicBlock.java
@@ -169,7 +169,7 @@ public class BasicBlock implements IGraphNode {
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
     for (int i = 0; i < seq.length(); i++) {
       if (i < instrOldOffsets.size()) {
diff --git a/src/org/jetbrains/java/decompiler/code/cfg/ControlFlowGraph.java b/src/org/jetbrains/java/decompiler/code/cfg/ControlFlowGraph.java
index 1e395ed..44c58f0 100644
--- a/src/org/jetbrains/java/decompiler/code/cfg/ControlFlowGraph.java
+++ b/src/org/jetbrains/java/decompiler/code/cfg/ControlFlowGraph.java
@@ -45,9 +45,9 @@ public class ControlFlowGraph implements CodeConstants {
 
   private List<ExceptionRangeCFG> exceptions;
 
-  private HashMap<BasicBlock, BasicBlock> subroutines;
+  private Map<BasicBlock, BasicBlock> subroutines;
 
-  private HashSet<BasicBlock> finallyExits = new HashSet<BasicBlock>();
+  private Set<BasicBlock> finallyExits = new HashSet<BasicBlock>();
 
   // *****************************************************************************
   // constructors
@@ -85,16 +85,16 @@ public class ControlFlowGraph implements CodeConstants {
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
     for (BasicBlock block : blocks) {
-      buf.append("----- Block " + block.id + " -----" + new_line_separator);
+      buf.append("----- Block ").append(block.id).append(" -----").append(new_line_separator);
       buf.append(block.toString());
-      buf.append("----- Edges -----" + new_line_separator);
+      buf.append("----- Edges -----").append(new_line_separator);
 
       List<BasicBlock> suc = block.getSuccs();
       for (int j = 0; j < suc.size(); j++) {
-        buf.append(">>>>>>>>(regular) Block " + suc.get(j).id + new_line_separator);
+        buf.append(">>>>>>>>(regular) Block ").append(suc.get(j).id).append(new_line_separator);
       }
       suc = block.getSuccExceptions();
       for (int j = 0; j < suc.size(); j++) {
@@ -102,21 +102,22 @@ public class ControlFlowGraph implements CodeConstants {
         ExceptionRangeCFG range = getExceptionRange(handler, block);
 
         if (range == null) {
-          buf.append(">>>>>>>>(exception) Block " + handler.id + "\t" + "ERROR: range not found!" + new_line_separator);
+          buf.append(">>>>>>>>(exception) Block ").append(handler.id).append("\t").append("ERROR: range not found!")
+            .append(new_line_separator);
         }
         else {
           List<String> exceptionTypes = range.getExceptionTypes();
           if (exceptionTypes == null) {
-            buf.append(">>>>>>>>(exception) Block " + handler.id + "\t" + "NULL" + new_line_separator);
+            buf.append(">>>>>>>>(exception) Block ").append(handler.id).append("\t").append("NULL").append(new_line_separator);
           }
           else {
             for (String exceptionType : exceptionTypes) {
-              buf.append(">>>>>>>>(exception) Block " + handler.id + "\t" + exceptionType + new_line_separator);
+              buf.append(">>>>>>>>(exception) Block ").append(handler.id).append("\t").append(exceptionType).append(new_line_separator);
             }
           }
         }
       }
-      buf.append("----- ----- -----" + new_line_separator);
+      buf.append("----- ----- -----").append(new_line_separator);
     }
 
     return buf.toString();
@@ -223,7 +224,7 @@ public class ControlFlowGraph implements CodeConstants {
 
     short[] states = findStartInstructions(instrseq);
 
-    HashMap<Integer, BasicBlock> mapInstrBlocks = new HashMap<Integer, BasicBlock>();
+    Map<Integer, BasicBlock> mapInstrBlocks = new HashMap<Integer, BasicBlock>();
     VBStyleCollection<BasicBlock, Integer> colBlocks = createBasicBlocks(states, instrseq, mapInstrBlocks);
 
     blocks = colBlocks;
@@ -237,12 +238,12 @@ public class ControlFlowGraph implements CodeConstants {
     setFirstAndLastBlocks();
   }
 
-  private short[] findStartInstructions(InstructionSequence seq) {
+  private static short[] findStartInstructions(InstructionSequence seq) {
 
     int len = seq.length();
     short[] inststates = new short[len];
 
-    HashSet<Integer> excSet = new HashSet<Integer>();
+    Set<Integer> excSet = new HashSet<Integer>();
 
     for (ExceptionHandler handler : seq.getExceptionTable().getHandlers()) {
       excSet.add(handler.from_instr);
@@ -287,8 +288,9 @@ public class ControlFlowGraph implements CodeConstants {
   }
 
 
-  private VBStyleCollection<BasicBlock, Integer> createBasicBlocks(short[] startblock, InstructionSequence instrseq,
-                                                                   HashMap<Integer, BasicBlock> mapInstrBlocks) {
+  private VBStyleCollection<BasicBlock, Integer> createBasicBlocks(short[] startblock,
+                                                                   InstructionSequence instrseq,
+                                                                   Map<Integer, BasicBlock> mapInstrBlocks) {
 
     VBStyleCollection<BasicBlock, Integer> col = new VBStyleCollection<BasicBlock, Integer>();
 
@@ -329,7 +331,7 @@ public class ControlFlowGraph implements CodeConstants {
   }
 
 
-  private void connectBlocks(List<BasicBlock> lstbb, HashMap<Integer, BasicBlock> mapInstrBlocks) {
+  private static void connectBlocks(List<BasicBlock> lstbb, Map<Integer, BasicBlock> mapInstrBlocks) {
 
     for (int i = 0; i < lstbb.size(); i++) {
 
@@ -365,7 +367,7 @@ public class ControlFlowGraph implements CodeConstants {
     }
   }
 
-  private void setExceptionEdges(InstructionSequence instrseq, HashMap<Integer, BasicBlock> instrBlocks) {
+  private void setExceptionEdges(InstructionSequence instrseq, Map<Integer, BasicBlock> instrBlocks) {
 
     exceptions = new ArrayList<ExceptionRangeCFG>();
 
@@ -404,7 +406,7 @@ public class ControlFlowGraph implements CodeConstants {
 
   private void setSubroutineEdges() {
 
-    final HashMap<BasicBlock, BasicBlock> subroutines = new HashMap<BasicBlock, BasicBlock>();
+    final Map<BasicBlock, BasicBlock> subroutines = new HashMap<BasicBlock, BasicBlock>();
 
     for (BasicBlock block : blocks) {
 
@@ -413,7 +415,7 @@ public class ControlFlowGraph implements CodeConstants {
         LinkedList<BasicBlock> stack = new LinkedList<BasicBlock>();
         LinkedList<LinkedList<BasicBlock>> stackJsrStacks = new LinkedList<LinkedList<BasicBlock>>();
 
-        HashSet<BasicBlock> setVisited = new HashSet<BasicBlock>();
+        Set<BasicBlock> setVisited = new HashSet<BasicBlock>();
 
         stack.add(block);
         stackJsrStacks.add(new LinkedList<BasicBlock>());
@@ -461,53 +463,64 @@ public class ControlFlowGraph implements CodeConstants {
   }
 
   private void processJsr() {
+    while (true) {
+      if (processJsrRanges() == 0) break;
+    }
+  }
 
-    while (processJsrRanges() != 0) ;
+  private static class JsrRecord {
+    private final BasicBlock jsr;
+    private final Set<BasicBlock> range;
+    private final BasicBlock ret;
+
+    private JsrRecord(BasicBlock jsr, Set<BasicBlock> range, BasicBlock ret) {
+      this.jsr = jsr;
+      this.range = range;
+      this.ret = ret;
+    }
   }
 
   private int processJsrRanges() {
 
-    List<Object[]> lstJsrAll = new ArrayList<Object[]>();
+    List<JsrRecord> lstJsrAll = new ArrayList<JsrRecord>();
 
     // get all jsr ranges
     for (Entry<BasicBlock, BasicBlock> ent : subroutines.entrySet()) {
       BasicBlock jsr = ent.getKey();
       BasicBlock ret = ent.getValue();
 
-      lstJsrAll.add(new Object[]{jsr, getJsrRange(jsr, ret), ret});
+      lstJsrAll.add(new JsrRecord(jsr, getJsrRange(jsr, ret), ret));
     }
 
     // sort ranges
     // FIXME: better sort order
-    List<Object[]> lstJsr = new ArrayList<Object[]>();
-    for (Object[] arr : lstJsrAll) {
+    List<JsrRecord> lstJsr = new ArrayList<JsrRecord>();
+    for (JsrRecord arr : lstJsrAll) {
       int i = 0;
       for (; i < lstJsr.size(); i++) {
-        Object[] arrJsr = lstJsr.get(i);
-
-        if (((HashSet<BasicBlock>)arrJsr[1]).contains(arr[0])) {
+        JsrRecord arrJsr = lstJsr.get(i);
+        if (arrJsr.range.contains(arr.jsr)) {
           break;
         }
       }
-
       lstJsr.add(i, arr);
     }
 
     // find the first intersection
     for (int i = 0; i < lstJsr.size(); i++) {
-      Object[] arr = lstJsr.get(i);
-      HashSet<BasicBlock> set = (HashSet<BasicBlock>)arr[1];
+      JsrRecord arr = lstJsr.get(i);
+      Set<BasicBlock> set = arr.range;
 
       for (int j = i + 1; j < lstJsr.size(); j++) {
-        Object[] arr1 = lstJsr.get(j);
-        HashSet<BasicBlock> set1 = (HashSet<BasicBlock>)arr1[1];
+        JsrRecord arr1 = lstJsr.get(j);
+        Set<BasicBlock> set1 = arr1.range;
 
-        if (!set.contains(arr1[0]) && !set1.contains(arr[0])) { // rang 0 doesn't contain entry 1 and vice versa
-          HashSet<BasicBlock> setc = new HashSet<BasicBlock>(set);
+        if (!set.contains(arr1.jsr) && !set1.contains(arr.jsr)) { // rang 0 doesn't contain entry 1 and vice versa
+          Set<BasicBlock> setc = new HashSet<BasicBlock>(set);
           setc.retainAll(set1);
 
           if (!setc.isEmpty()) {
-            splitJsrRange((BasicBlock)arr[0], (BasicBlock)arr[2], setc);
+            splitJsrRange(arr.jsr, arr.ret, setc);
             return 1;
           }
         }
@@ -517,11 +530,11 @@ public class ControlFlowGraph implements CodeConstants {
     return 0;
   }
 
-  private HashSet<BasicBlock> getJsrRange(BasicBlock jsr, BasicBlock ret) {
+  private Set<BasicBlock> getJsrRange(BasicBlock jsr, BasicBlock ret) {
 
-    HashSet<BasicBlock> blocks = new HashSet<BasicBlock>();
+    Set<BasicBlock> blocks = new HashSet<BasicBlock>();
 
-    LinkedList<BasicBlock> lstNodes = new LinkedList<BasicBlock>();
+    List<BasicBlock> lstNodes = new LinkedList<BasicBlock>();
     lstNodes.add(jsr);
 
     BasicBlock dom = jsr.getSuccs().get(0);
@@ -581,10 +594,10 @@ public class ControlFlowGraph implements CodeConstants {
     return blocks;
   }
 
-  private void splitJsrRange(BasicBlock jsr, BasicBlock ret, HashSet<BasicBlock> common_blocks) {
+  private void splitJsrRange(BasicBlock jsr, BasicBlock ret, Set<BasicBlock> common_blocks) {
 
-    LinkedList<BasicBlock> lstNodes = new LinkedList<BasicBlock>();
-    HashMap<Integer, BasicBlock> mapNewNodes = new HashMap<Integer, BasicBlock>();
+    List<BasicBlock> lstNodes = new LinkedList<BasicBlock>();
+    Map<Integer, BasicBlock> mapNewNodes = new HashMap<Integer, BasicBlock>();
 
     lstNodes.add(jsr);
     mapNewNodes.put(jsr.id, jsr);
@@ -662,7 +675,7 @@ public class ControlFlowGraph implements CodeConstants {
     splitJsrExceptionRanges(common_blocks, mapNewNodes);
   }
 
-  private void splitJsrExceptionRanges(HashSet<BasicBlock> common_blocks, HashMap<Integer, BasicBlock> mapNewNodes) {
+  private void splitJsrExceptionRanges(Set<BasicBlock> common_blocks, Map<Integer, BasicBlock> mapNewNodes) {
 
     for (int i = exceptions.size() - 1; i >= 0; i--) {
 
@@ -696,7 +709,7 @@ public class ControlFlowGraph implements CodeConstants {
     removeJsrInstructions(mt.getClassStruct().getPool(), first, DataPoint.getInitialDataPoint(mt));
   }
 
-  private void removeJsrInstructions(ConstantPool pool, BasicBlock block, DataPoint data) {
+  private static void removeJsrInstructions(ConstantPool pool, BasicBlock block, DataPoint data) {
 
     ListStack<VarType> stack = data.getStack();
 
@@ -765,18 +778,18 @@ public class ControlFlowGraph implements CodeConstants {
 
   public List<BasicBlock> getReversePostOrder() {
 
-    LinkedList<BasicBlock> res = new LinkedList<BasicBlock>();
+    List<BasicBlock> res = new LinkedList<BasicBlock>();
     addToReversePostOrderListIterative(first, res);
 
     return res;
   }
 
-  private void addToReversePostOrderListIterative(BasicBlock root, List<BasicBlock> lst) {
+  private static void addToReversePostOrderListIterative(BasicBlock root, List<BasicBlock> lst) {
 
     LinkedList<BasicBlock> stackNode = new LinkedList<BasicBlock>();
     LinkedList<Integer> stackIndex = new LinkedList<Integer>();
 
-    HashSet<BasicBlock> setVisited = new HashSet<BasicBlock>();
+    Set<BasicBlock> setVisited = new HashSet<BasicBlock>();
 
     stackNode.add(root);
     stackIndex.add(0);
@@ -845,32 +858,26 @@ public class ControlFlowGraph implements CodeConstants {
     this.exceptions = exceptions;
   }
 
-
   public BasicBlock getLast() {
     return last;
   }
 
-
   public void setLast(BasicBlock last) {
     this.last = last;
   }
 
-
-  public HashMap<BasicBlock, BasicBlock> getSubroutines() {
+  public Map<BasicBlock, BasicBlock> getSubroutines() {
     return subroutines;
   }
 
-
-  public void setSubroutines(HashMap<BasicBlock, BasicBlock> subroutines) {
+  public void setSubroutines(Map<BasicBlock, BasicBlock> subroutines) {
     this.subroutines = subroutines;
   }
 
-
-  public HashSet<BasicBlock> getFinallyExits() {
+  public Set<BasicBlock> getFinallyExits() {
     return finallyExits;
   }
 
-
   public void setFinallyExits(HashSet<BasicBlock> finallyExits) {
     this.finallyExits = finallyExits;
   }
diff --git a/src/org/jetbrains/java/decompiler/code/cfg/ExceptionRangeCFG.java b/src/org/jetbrains/java/decompiler/code/cfg/ExceptionRangeCFG.java
index 7d83ef6..47e0e21 100644
--- a/src/org/jetbrains/java/decompiler/code/cfg/ExceptionRangeCFG.java
+++ b/src/org/jetbrains/java/decompiler/code/cfg/ExceptionRangeCFG.java
@@ -47,18 +47,18 @@ public class ExceptionRangeCFG {
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
     buf.append("exceptionType:");
     for (String exception_type : exceptionTypes) {
-      buf.append(" " + exception_type);
+      buf.append(" ").append(exception_type);
     }
     buf.append(new_line_separator);
 
-    buf.append("handler: " + handler.id + new_line_separator);
+    buf.append("handler: ").append(handler.id).append(new_line_separator);
     buf.append("range: ");
     for (int i = 0; i < protectedRange.size(); i++) {
-      buf.append(protectedRange.get(i).id + " ");
+      buf.append(protectedRange.get(i).id).append(" ");
     }
     buf.append(new_line_separator);
 
diff --git a/src/org/jetbrains/java/decompiler/main/ClassReference14Processor.java b/src/org/jetbrains/java/decompiler/main/ClassReference14Processor.java
index 060497a..937d59b 100644
--- a/src/org/jetbrains/java/decompiler/main/ClassReference14Processor.java
+++ b/src/org/jetbrains/java/decompiler/main/ClassReference14Processor.java
@@ -122,9 +122,9 @@ public class ClassReference14Processor {
     }
   }
 
-  private void processClassRec(ClassNode node,
-                               final HashMap<ClassWrapper, MethodWrapper> mapClassMeths,
-                               final HashSet<ClassWrapper> setFound) {
+  private static void processClassRec(ClassNode node,
+                                      final HashMap<ClassWrapper, MethodWrapper> mapClassMeths,
+                                      final HashSet<ClassWrapper> setFound) {
 
     final ClassWrapper wrapper = node.wrapper;
 
@@ -221,7 +221,7 @@ public class ClassReference14Processor {
   }
 
 
-  private boolean replaceInvocations(Exprent exprent, ClassWrapper wrapper, MethodWrapper meth) {
+  private static boolean replaceInvocations(Exprent exprent, ClassWrapper wrapper, MethodWrapper meth) {
 
     boolean res = false;
 
@@ -250,7 +250,7 @@ public class ClassReference14Processor {
   }
 
 
-  private String isClass14Invocation(Exprent exprent, ClassWrapper wrapper, MethodWrapper meth) {
+  private static String isClass14Invocation(Exprent exprent, ClassWrapper wrapper, MethodWrapper meth) {
 
     if (exprent.type == Exprent.EXPRENT_FUNCTION) {
       FunctionExprent fexpr = (FunctionExprent)exprent;
diff --git a/src/org/jetbrains/java/decompiler/main/ClassWriter.java b/src/org/jetbrains/java/decompiler/main/ClassWriter.java
index 7808b26..d16c203 100644
--- a/src/org/jetbrains/java/decompiler/main/ClassWriter.java
+++ b/src/org/jetbrains/java/decompiler/main/ClassWriter.java
@@ -1046,7 +1046,7 @@ public class ClassWriter {
     return !hidemethod;
   }
 
-  private List<AnnotationExprent> getAllAnnotations(VBStyleCollection<StructGeneralAttribute, String> attributes) {
+  private static List<AnnotationExprent> getAllAnnotations(VBStyleCollection<StructGeneralAttribute, String> attributes) {
 
     String[] annattrnames = new String[]{StructGeneralAttribute.ATTRIBUTE_RUNTIME_VISIBLE_ANNOTATIONS,
       StructGeneralAttribute.ATTRIBUTE_RUNTIME_INVISIBLE_ANNOTATIONS};
@@ -1063,7 +1063,7 @@ public class ClassWriter {
     return lst;
   }
 
-  private List<List<AnnotationExprent>> getAllParameterAnnotations(VBStyleCollection<StructGeneralAttribute, String> attributes) {
+  private static List<List<AnnotationExprent>> getAllParameterAnnotations(VBStyleCollection<StructGeneralAttribute, String> attributes) {
 
     String[] annattrnames = new String[]{StructGeneralAttribute.ATTRIBUTE_RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS,
       StructGeneralAttribute.ATTRIBUTE_RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS};
@@ -1095,7 +1095,7 @@ public class ClassWriter {
     return ret;
   }
 
-  private String getDescriptorPrintOut(String descriptor, int element) {
+  private static String getDescriptorPrintOut(String descriptor, int element) {
 
     switch (element) {
       case 0: // class
@@ -1125,7 +1125,7 @@ public class ClassWriter {
     }
   }
 
-  private String getTypePrintOut(VarType type) {
+  private static String getTypePrintOut(VarType type) {
     String strtype = ExprProcessor.getCastTypeName(type, false);
     if (ExprProcessor.UNDEFINED_TYPE_STRING.equals(strtype) &&
         DecompilerContext.getOption(IFernflowerPreferences.UNDEFINED_PARAM_TYPE_OBJECT)) {
diff --git a/src/org/jetbrains/java/decompiler/main/ClassesProcessor.java b/src/org/jetbrains/java/decompiler/main/ClassesProcessor.java
index 155dee0..9230c68 100644
--- a/src/org/jetbrains/java/decompiler/main/ClassesProcessor.java
+++ b/src/org/jetbrains/java/decompiler/main/ClassesProcessor.java
@@ -303,7 +303,7 @@ public class ClassesProcessor {
     }
   }
 
-  private void initWrappers(ClassNode node) throws IOException {
+  private static void initWrappers(ClassNode node) throws IOException {
 
     if (node.type == ClassNode.CLASS_LAMBDA) {
       return;
@@ -319,7 +319,7 @@ public class ClassesProcessor {
     }
   }
 
-  private void addClassnameToImport(ClassNode node, ImportCollector imp) {
+  private static void addClassnameToImport(ClassNode node, ImportCollector imp) {
 
     if (node.simpleName != null && node.simpleName.length() > 0) {
       imp.getShortName(node.type == ClassNode.CLASS_ROOT ? node.classStruct.qualifiedName : node.simpleName, false);
@@ -330,7 +330,7 @@ public class ClassesProcessor {
     }
   }
 
-  private void destroyWrappers(ClassNode node) {
+  private static void destroyWrappers(ClassNode node) {
 
     node.wrapper = null;
     node.classStruct.releaseResources();
@@ -345,7 +345,7 @@ public class ClassesProcessor {
   }
 
 
-  public class ClassNode {
+  public static class ClassNode {
 
     public static final int CLASS_ROOT = 0;
     public static final int CLASS_MEMBER = 1;
@@ -436,9 +436,7 @@ public class ClassesProcessor {
       return null;
     }
 
-    public class LambdaInformation {
-
-
+    public static class LambdaInformation {
       public String class_name;
       public String method_name;
       public String method_descriptor;
diff --git a/src/org/jetbrains/java/decompiler/main/Fernflower.java b/src/org/jetbrains/java/decompiler/main/Fernflower.java
index bc0fcd4..88655a9 100644
--- a/src/org/jetbrains/java/decompiler/main/Fernflower.java
+++ b/src/org/jetbrains/java/decompiler/main/Fernflower.java
@@ -50,9 +50,7 @@ public class Fernflower implements IDecompiledData {
   public void decompileContext() {
 
     if (DecompilerContext.getOption(IFernflowerPreferences.RENAME_ENTITIES)) {
-      IdentifierConverter ren = new IdentifierConverter();
-      ren.rename(structcontext);
-      ren = null;
+      new IdentifierConverter().rename(structcontext);
     }
 
     clprocessor = new ClassesProcessor(structcontext);
diff --git a/src/org/jetbrains/java/decompiler/main/decompiler/ConsoleDecompiler.java b/src/org/jetbrains/java/decompiler/main/decompiler/ConsoleDecompiler.java
index 0a8261f..50a55cf 100644
--- a/src/org/jetbrains/java/decompiler/main/decompiler/ConsoleDecompiler.java
+++ b/src/org/jetbrains/java/decompiler/main/decompiler/ConsoleDecompiler.java
@@ -311,8 +311,7 @@ public class ConsoleDecompiler implements IBytecodeProvider, IDecompilatSaver {
       String filename = new File(getAbsolutePath(path), archivename).getAbsolutePath();
 
       mapArchiveEntries.remove(filename);
-      ZipOutputStream out = mapArchiveStreams.remove(filename);
-
+      OutputStream out = mapArchiveStreams.remove(filename);
       out.flush();
       out.close();
     }
diff --git a/src/org/jetbrains/java/decompiler/main/rels/ClassWrapper.java b/src/org/jetbrains/java/decompiler/main/rels/ClassWrapper.java
index f0e8591..0991fa4 100644
--- a/src/org/jetbrains/java/decompiler/main/rels/ClassWrapper.java
+++ b/src/org/jetbrains/java/decompiler/main/rels/ClassWrapper.java
@@ -67,6 +67,8 @@ public class ClassWrapper {
       setFieldNames.add(fd.getName());
     }
 
+    int maxsec = Integer.parseInt(DecompilerContext.getProperty(IFernflowerPreferences.MAX_PROCESSING_METHOD).toString());
+
     for (StructMethod mt : classStruct.getMethods()) {
 
       DecompilerContext.getLogger().startMethod(mt.getName() + " " + mt.getDescriptor());
@@ -83,7 +85,6 @@ public class ClassWrapper {
       VarProcessor varproc = new VarProcessor();
       DecompilerContext.setProperty(DecompilerContext.CURRENT_VAR_PROCESSOR, varproc);
 
-      Thread mtthread = null;
       RootStatement root = null;
 
       boolean isError = false;
@@ -91,28 +92,25 @@ public class ClassWrapper {
       try {
         if (mt.containsCode()) {
 
-          int maxsec = 10 * Integer.parseInt(DecompilerContext.getProperty(IFernflowerPreferences.MAX_PROCESSING_METHOD).toString());
-
           if (maxsec == 0) { // blocking wait
             root = MethodProcessorThread.codeToJava(mt, varproc);
           }
           else {
             MethodProcessorThread mtproc = new MethodProcessorThread(mt, varproc, DecompilerContext.getCurrentContext());
-            mtthread = new Thread(mtproc);
+            Thread mtthread = new Thread(mtproc);
+            long stopAt = System.currentTimeMillis() + maxsec * 1000;
 
             mtthread.start();
 
-            int sec = 0;
             while (mtthread.isAlive()) {
 
-              synchronized (mtproc) {
-                mtproc.wait(100);
+              synchronized (mtproc.lock) {
+                mtproc.lock.wait(100);
               }
 
-              if (maxsec > 0 && ++sec > maxsec) {
-                DecompilerContext.getLogger().writeMessage("Processing time limit (" + maxsec + " sec.) for method " +
-                                                           mt.getName() + " " + mt.getDescriptor() + " exceeded, execution interrupted.",
-                                                           IFernflowerLogger.ERROR);
+              if (System.currentTimeMillis() >= stopAt) {
+                String message = "Processing time limit exceeded for method " + mt.getName() + ", execution interrupted.";
+                DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.ERROR);
                 mtthread.stop();
                 isError = true;
                 break;
@@ -120,12 +118,7 @@ public class ClassWrapper {
             }
 
             if (!isError) {
-              if (mtproc.getError() != null) {
-                throw mtproc.getError();
-              }
-              else {
-                root = mtproc.getRoot();
-              }
+              root = mtproc.getResult();
             }
           }
         }
@@ -158,17 +151,6 @@ public class ClassWrapper {
           }
         }
       }
-      catch (ThreadDeath ex) {
-        try {
-          if (mtthread != null) {
-            mtthread.stop();
-          }
-        }
-        catch (Throwable ignored) {
-        }
-
-        throw ex;
-      }
       catch (Throwable ex) {
         DecompilerContext.getLogger().writeMessage("Method " + mt.getName() + " " + mt.getDescriptor() + " couldn't be decompiled.", ex);
         isError = true;
diff --git a/src/org/jetbrains/java/decompiler/main/rels/LambdaProcessor.java b/src/org/jetbrains/java/decompiler/main/rels/LambdaProcessor.java
index 3d42bda..3150894 100644
--- a/src/org/jetbrains/java/decompiler/main/rels/LambdaProcessor.java
+++ b/src/org/jetbrains/java/decompiler/main/rels/LambdaProcessor.java
@@ -112,9 +112,9 @@ public class LambdaProcessor {
 
               LinkConstant content_method_handle = (LinkConstant)bootstrap_arguments.get(1);
 
-              ClassNode node_lambda = clprocessor.new ClassNode(content_method_handle.classname, content_method_handle.elementname,
-                                                                content_method_handle.descriptor, content_method_handle.index1,
-                                                                lambda_class_name, lambda_method_name, lambda_method_descriptor, cl);
+              ClassNode node_lambda = new ClassNode(content_method_handle.classname, content_method_handle.elementname,
+                                                    content_method_handle.descriptor, content_method_handle.index1,
+                                                    lambda_class_name, lambda_method_name, lambda_method_descriptor, cl);
               node_lambda.simpleName = cl.qualifiedName + "##Lambda_" + invoke_dynamic.index1 + "_" + invoke_dynamic.index2;
               node_lambda.enclosingMethod = InterpreterUtil.makeUniqueKey(mt.getName(), mt.getDescriptor());
 
diff --git a/src/org/jetbrains/java/decompiler/main/rels/MethodProcessorThread.java b/src/org/jetbrains/java/decompiler/main/rels/MethodProcessorThread.java
index eeee352..da05640 100644
--- a/src/org/jetbrains/java/decompiler/main/rels/MethodProcessorThread.java
+++ b/src/org/jetbrains/java/decompiler/main/rels/MethodProcessorThread.java
@@ -33,16 +33,16 @@ import java.io.IOException;
 
 public class MethodProcessorThread implements Runnable {
 
-  private StructMethod method;
-  private VarProcessor varproc;
-  private DecompilerContext parentContext;
+  public final Object lock = new Object();
 
-  private RootStatement root;
+  private final StructMethod method;
+  private final VarProcessor varproc;
+  private final DecompilerContext parentContext;
 
-  private Throwable error;
+  private volatile RootStatement root;
+  private volatile Throwable error;
 
-  public MethodProcessorThread(StructMethod method, VarProcessor varproc,
-                               DecompilerContext parentContext) {
+  public MethodProcessorThread(StructMethod method, VarProcessor varproc, DecompilerContext parentContext) {
     this.method = method;
     this.varproc = varproc;
     this.parentContext = parentContext;
@@ -58,11 +58,13 @@ public class MethodProcessorThread implements Runnable {
     try {
       root = codeToJava(method, varproc);
 
-      synchronized (this) {
-        this.notify();
+      synchronized (lock) {
+        lock.notifyAll();
       }
     }
-    catch (ThreadDeath ignored) { }
+    catch (ThreadDeath ex) {
+      throw ex;
+    }
     catch (Throwable ex) {
       error = ex;
     }
@@ -248,7 +250,9 @@ public class MethodProcessorThread implements Runnable {
     return root;
   }
 
-  public RootStatement getRoot() {
+  public RootStatement getResult() throws Throwable {
+    Throwable t = error;
+    if (t != null) throw t;
     return root;
   }
 
diff --git a/src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java b/src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java
index 6cd2204..e637632 100644
--- a/src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java
+++ b/src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java
@@ -101,7 +101,7 @@ public class NestedClassProcessor {
     }
   }
 
-  private void setLambdaVars(ClassNode parent, ClassNode child) {
+  private static void setLambdaVars(ClassNode parent, ClassNode child) {
 
     if (child.lambda_information.is_method_reference) { // method reference, no code and no parameters
       return;
@@ -187,7 +187,7 @@ public class NestedClassProcessor {
     }
   }
 
-  private void checkNotFoundClasses(ClassNode root, ClassNode node) {
+  private static void checkNotFoundClasses(ClassNode root, ClassNode node) {
 
     List<ClassNode> lstChildren = new ArrayList<ClassNode>(node.nested);
 
@@ -232,7 +232,7 @@ public class NestedClassProcessor {
     }
   }
 
-  private boolean insertNestedClass(ClassNode root, ClassNode child) {
+  private static boolean insertNestedClass(ClassNode root, ClassNode child) {
 
     Set<String> setEnclosing = child.enclosingClasses;
 
@@ -258,7 +258,7 @@ public class NestedClassProcessor {
   }
 
 
-  private void computeLocalVarsAndDefinitions(final ClassNode node) {
+  private static void computeLocalVarsAndDefinitions(final ClassNode node) {
 
     // local var masks
     // class name, constructor descriptor, field mask
@@ -433,7 +433,7 @@ public class NestedClassProcessor {
     }
   }
 
-  private void insertLocalVars(final ClassNode parent, final ClassNode child) {
+  private static void insertLocalVars(final ClassNode parent, final ClassNode child) {
 
     // enclosing method, is null iff member class
     MethodWrapper encmeth = parent.wrapper.getMethods().getWithKey(child.enclosingMethod);
@@ -634,7 +634,7 @@ public class NestedClassProcessor {
     }
   }
 
-  private HashMap<String, List<VarFieldPair>> getMaskLocalVars(ClassWrapper wrapper) {
+  private static HashMap<String, List<VarFieldPair>> getMaskLocalVars(ClassWrapper wrapper) {
 
     HashMap<String, List<VarFieldPair>> mapMasks = new HashMap<String, List<VarFieldPair>>();
 
@@ -666,7 +666,7 @@ public class NestedClassProcessor {
     return mapMasks;
   }
 
-  private String getEnclosingVarField(StructClass cl, MethodWrapper meth, DirectGraph graph, final int index) {
+  private static String getEnclosingVarField(StructClass cl, MethodWrapper meth, DirectGraph graph, final int index) {
 
     String field = "";
 
@@ -709,7 +709,7 @@ public class NestedClassProcessor {
     return field;
   }
 
-  private void mergeListSignatures(List<VarFieldPair> first, List<VarFieldPair> second, boolean both) {
+  private static void mergeListSignatures(List<VarFieldPair> first, List<VarFieldPair> second, boolean both) {
 
     int i = 1;
     while (true) {
@@ -818,7 +818,7 @@ public class NestedClassProcessor {
   }
 
 
-  private void setLocalClassDefinition(MethodWrapper meth, ClassNode node) {
+  private static void setLocalClassDefinition(MethodWrapper meth, ClassNode node) {
 
     RootStatement root = meth.root;
 
@@ -862,7 +862,7 @@ public class NestedClassProcessor {
   }
 
 
-  private Statement findFirstBlock(Statement stat, HashSet<Statement> setStats) {
+  private static Statement findFirstBlock(Statement stat, HashSet<Statement> setStats) {
 
     LinkedList<Statement> stack = new LinkedList<Statement>();
     stack.add(stat);
@@ -903,7 +903,7 @@ public class NestedClassProcessor {
   }
 
 
-  private Statement getDefStatement(Statement stat, VarType classtype, HashSet<Statement> setStats) {
+  private static Statement getDefStatement(Statement stat, VarType classtype, HashSet<Statement> setStats) {
 
     List<Exprent> condlst = new ArrayList<Exprent>();
     Statement retstat = null;
@@ -958,7 +958,7 @@ public class NestedClassProcessor {
     return retstat;
   }
 
-  private boolean searchForClass(Exprent exprent, VarType classtype) {
+  private static boolean searchForClass(Exprent exprent, VarType classtype) {
 
     List<Exprent> lst = exprent.getAllExprents(true);
     lst.add(exprent);
@@ -1004,7 +1004,7 @@ public class NestedClassProcessor {
   }
 
 
-  private class VarFieldPair {
+  private static class VarFieldPair {
 
     public String keyfield = "";
     public VarVersionPaar varpaar;
diff --git a/src/org/jetbrains/java/decompiler/main/rels/NestedMemberAccess.java b/src/org/jetbrains/java/decompiler/main/rels/NestedMemberAccess.java
index d8c67ac..8551856 100644
--- a/src/org/jetbrains/java/decompiler/main/rels/NestedMemberAccess.java
+++ b/src/org/jetbrains/java/decompiler/main/rels/NestedMemberAccess.java
@@ -310,7 +310,7 @@ public class NestedMemberAccess {
     return res;
   }
 
-  private boolean sameTree(ClassNode caller, ClassNode callee) {
+  private static boolean sameTree(ClassNode caller, ClassNode callee) {
 
     if (caller.classStruct.qualifiedName.equals(callee.classStruct.qualifiedName)) {
       return false;
diff --git a/src/org/jetbrains/java/decompiler/modules/code/DeadCodeHelper.java b/src/org/jetbrains/java/decompiler/modules/code/DeadCodeHelper.java
index e8377ae..c7dd8ca 100644
--- a/src/org/jetbrains/java/decompiler/modules/code/DeadCodeHelper.java
+++ b/src/org/jetbrains/java/decompiler/modules/code/DeadCodeHelper.java
@@ -24,10 +24,7 @@ import org.jetbrains.java.decompiler.code.cfg.ExceptionRangeCFG;
 import org.jetbrains.java.decompiler.main.DecompilerContext;
 import org.jetbrains.java.decompiler.main.extern.IFernflowerPreferences;
 
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.LinkedList;
-import java.util.List;
+import java.util.*;
 
 public class DeadCodeHelper {
 
@@ -177,7 +174,7 @@ public class DeadCodeHelper {
         }
 
         // finally exit edges
-        HashSet<BasicBlock> setFinallyExits = graph.getFinallyExits();
+        Set<BasicBlock> setFinallyExits = graph.getFinallyExits();
         if (setFinallyExits.contains(block)) {
           setFinallyExits.remove(block);
           setFinallyExits.add(setPreds.iterator().next());
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java b/src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java
index 50b6673..9c719db 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java
@@ -83,11 +83,8 @@ public class DecHelper {
       boolean repeat = false;
 
       setDest.remove(post);
-      Iterator<Statement> it = setDest.iterator();
-
-      while (it.hasNext()) {
-        Statement stat = it.next();
 
+      for (Statement stat : setDest) {
         if (stat.getLastBasicType() != Statement.LASTBASICTYPE_GENERAL) {
           if (post == null) {
             post = stat;
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/DomHelper.java b/src/org/jetbrains/java/decompiler/modules/decompiler/DomHelper.java
index 2b911e7..422b93b 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/DomHelper.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/DomHelper.java
@@ -497,10 +497,7 @@ public class DomHelper {
         while (true) {
 
           boolean hdfound = false;
-          Iterator<Statement> itHandlers = setHandlers.iterator();
-          while (itHandlers.hasNext()) {
-            Statement handler = itHandlers.next();
-
+          for (Statement handler : setHandlers) {
             if (setNodes.contains(handler)) {
               continue;
             }
@@ -553,9 +550,7 @@ public class DomHelper {
         setHandlers.removeAll(setNodes);
 
         boolean excok = true;
-        Iterator<Statement> itt = setHandlers.iterator();
-        while (itt.hasNext()) {
-          Statement handler = itt.next();
+        for (Statement handler : setHandlers) {
           if (!handler.getNeighbours(StatEdge.TYPE_EXCEPTION, Statement.DIRECTION_BACKWARD).containsAll(setNodes)) {
             excok = false;
             break;
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/ExprProcessor.java b/src/org/jetbrains/java/decompiler/modules/decompiler/ExprProcessor.java
index 1612d32..50b04a9 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/ExprProcessor.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/ExprProcessor.java
@@ -259,7 +259,7 @@ public class ExprProcessor implements CodeConstants {
   }
 
   // FIXME: Ugly code, to be rewritten. A tuple class is needed.
-  private String buildEntryPointKey(LinkedList<String> entrypoints) {
+  private static String buildEntryPointKey(LinkedList<String> entrypoints) {
     if (entrypoints.isEmpty()) {
       return null;
     }
@@ -273,7 +273,7 @@ public class ExprProcessor implements CodeConstants {
     }
   }
 
-  private PrimitiveExprsList copyVarExprents(PrimitiveExprsList data) {
+  private static PrimitiveExprsList copyVarExprents(PrimitiveExprsList data) {
     ExprentStack stack = data.getStack();
     for (int i = 0; i < stack.size(); i++) {
       stack.set(i, stack.get(i).copy());
@@ -281,7 +281,7 @@ public class ExprProcessor implements CodeConstants {
     return data;
   }
 
-  private void collectCatchVars(Statement stat, FlattenStatementsHelper flatthelper, Map<String, VarExprent> map) {
+  private static void collectCatchVars(Statement stat, FlattenStatementsHelper flatthelper, Map<String, VarExprent> map) {
 
     List<VarExprent> lst = null;
 
@@ -306,7 +306,7 @@ public class ExprProcessor implements CodeConstants {
     }
   }
 
-  private void initStatementExprents(Statement stat) {
+  private static void initStatementExprents(Statement stat) {
     stat.initExprents();
 
     for (Statement st : stat.getStats()) {
@@ -754,7 +754,7 @@ public class ExprProcessor implements CodeConstants {
   }
 
   public static String jmpWrapper(Statement stat, int indent, boolean semicolon) {
-    StringBuffer buf = new StringBuffer(stat.toJava(indent));
+    StringBuilder buf = new StringBuilder(stat.toJava(indent));
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
@@ -773,14 +773,14 @@ public class ExprProcessor implements CodeConstants {
         }
 
         if (edge.labeled) {
-          buf.append(" label" + edge.closure.id);
+          buf.append(" label").append(edge.closure.id);
         }
-        buf.append(";" + new_line_separator);
+        buf.append(";").append(new_line_separator);
       }
     }
 
     if (buf.length() == 0 && semicolon) {
-      buf.append(InterpreterUtil.getIndentString(indent) + ";" + new_line_separator);
+      buf.append(InterpreterUtil.getIndentString(indent)).append(";").append(new_line_separator);
     }
 
     return buf.toString();
@@ -789,7 +789,7 @@ public class ExprProcessor implements CodeConstants {
   public static String buildJavaClassName(String name) {
     String res = name.replace('/', '.');
 
-    if (res.indexOf("$") >= 0) { // attempt to invoke foreign member
+    if (res.contains("$")) { // attempt to invoke foreign member
       // classes correctly
       StructClass cl = DecompilerContext.getStructcontext().getClass(name);
       if (cl == null || !cl.isOwn()) {
@@ -808,7 +808,7 @@ public class ExprProcessor implements CodeConstants {
     String indstr = InterpreterUtil.getIndentString(indent);
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
     for (Exprent expr : lst) {
       String content = expr.toJava(indent);
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/FinallyProcessor.java b/src/org/jetbrains/java/decompiler/modules/decompiler/FinallyProcessor.java
index 103b933..53be24b 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/FinallyProcessor.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/FinallyProcessor.java
@@ -46,9 +46,8 @@ import java.util.Map.Entry;
 
 public class FinallyProcessor {
 
-
-  private HashMap<Integer, Integer> finallyBlockIDs = new HashMap<Integer, Integer>();
-  private HashMap<Integer, Integer> catchallBlockIDs = new HashMap<Integer, Integer>();
+  private Map<Integer, Integer> finallyBlockIDs = new HashMap<Integer, Integer>();
+  private Map<Integer, Integer> catchallBlockIDs = new HashMap<Integer, Integer>();
 
   private VarProcessor varprocessor;
 
@@ -92,7 +91,7 @@ public class FinallyProcessor {
         }
         else {
 
-          Object[] inf = getFinallyInformation(mt, root, fin);
+          Record inf = getFinallyInformation(mt, root, fin);
 
           if (inf == null) { // inconsistent finally
             catchallBlockIDs.put(handler.id, null);
@@ -181,10 +180,20 @@ public class FinallyProcessor {
   //		return res;
   //	}
 
+  private static class Record {
+    private final int firstCode;
+    private final Map<BasicBlock, Boolean> mapLast;
 
-  private Object[] getFinallyInformation(StructMethod mt, RootStatement root, CatchAllStatement fstat) {
+    private Record(int firstCode, Map<BasicBlock, Boolean> mapLast) {
+      this.firstCode = firstCode;
+      this.mapLast = mapLast;
+    }
+  }
 
-    HashMap<BasicBlock, Boolean> mapLast = new HashMap<BasicBlock, Boolean>();
+
+  private static Record getFinallyInformation(StructMethod mt, RootStatement root, CatchAllStatement fstat) {
+
+    Map<BasicBlock, Boolean> mapLast = new HashMap<BasicBlock, Boolean>();
 
     BasicBlockStatement firstBlockStatement = fstat.getHandler().getBasichead();
     BasicBlock firstBasicBlock = firstBlockStatement.getBlock();
@@ -216,7 +225,7 @@ public class FinallyProcessor {
     LinkedList<DirectNode> stack = new LinkedList<DirectNode>();
     stack.add(dgraph.first);
 
-    HashSet<DirectNode> setVisited = new HashSet<DirectNode>();
+    Set<DirectNode> setVisited = new HashSet<DirectNode>();
 
     while (!stack.isEmpty()) {
 
@@ -356,21 +365,21 @@ public class FinallyProcessor {
       }
     }
 
-    return new Object[]{firstcode, mapLast};
+    return new Record(firstcode, mapLast);
   }
 
-  private void insertSemaphore(ControlFlowGraph graph,
-                               HashSet<BasicBlock> setTry,
-                               BasicBlock head,
-                               BasicBlock handler,
-                               int var,
-                               Object[] information,
-                               int bytecode_version) {
+  private static void insertSemaphore(ControlFlowGraph graph,
+                                      Set<BasicBlock> setTry,
+                                      BasicBlock head,
+                                      BasicBlock handler,
+                                      int var,
+                                      Record information,
+                                      int bytecode_version) {
 
-    HashSet<BasicBlock> setCopy = new HashSet<BasicBlock>(setTry);
+    Set<BasicBlock> setCopy = new HashSet<BasicBlock>(setTry);
 
-    int finallytype = (Integer)information[0];
-    HashMap<BasicBlock, Boolean> mapLast = (HashMap<BasicBlock, Boolean>)information[1];
+    int finallytype = information.firstCode;
+    Map<BasicBlock, Boolean> mapLast = information.mapLast;
 
     // first and last statements
     removeExceptionInstructionsEx(handler, 1, finallytype);
@@ -468,7 +477,7 @@ public class FinallyProcessor {
   }
 
 
-  private void insertBlockBefore(ControlFlowGraph graph, BasicBlock oldblock, BasicBlock newblock) {
+  private static void insertBlockBefore(ControlFlowGraph graph, BasicBlock oldblock, BasicBlock newblock) {
 
     List<BasicBlock> lstTemp = new ArrayList<BasicBlock>();
     lstTemp.addAll(oldblock.getPreds());
@@ -501,7 +510,7 @@ public class FinallyProcessor {
     }
   }
 
-  private HashSet<BasicBlock> getAllBasicBlocks(Statement stat) {
+  private static HashSet<BasicBlock> getAllBasicBlocks(Statement stat) {
 
     List<Statement> lst = new LinkedList<Statement>();
     lst.add(stat);
@@ -530,13 +539,13 @@ public class FinallyProcessor {
   }
 
 
-  private boolean verifyFinallyEx(ControlFlowGraph graph, CatchAllStatement fstat, Object[] information) {
+  private boolean verifyFinallyEx(ControlFlowGraph graph, CatchAllStatement fstat, Record information) {
 
     HashSet<BasicBlock> tryBlocks = getAllBasicBlocks(fstat.getFirst());
     HashSet<BasicBlock> catchBlocks = getAllBasicBlocks(fstat.getHandler());
 
-    int finallytype = (Integer)information[0];
-    HashMap<BasicBlock, Boolean> mapLast = (HashMap<BasicBlock, Boolean>)information[1];
+    int finallytype = information.firstCode;
+    Map<BasicBlock, Boolean> mapLast = information.mapLast;
 
     BasicBlock first = fstat.getHandler().getBasichead().getBlock();
     boolean skippedFirst = false;
@@ -571,16 +580,16 @@ public class FinallyProcessor {
     startBlocks.remove(graph.getLast());
     startBlocks.removeAll(tryBlocks);
 
-    List<Object[]> lstAreas = new ArrayList<Object[]>();
+    List<Area> lstAreas = new ArrayList<Area>();
 
     for (BasicBlock start : startBlocks) {
 
-      Object[] arr = compareSubgraphsEx(graph, start, catchBlocks, first, finallytype, mapLast, skippedFirst);
+      Area arr = compareSubgraphsEx(graph, start, catchBlocks, first, finallytype, mapLast, skippedFirst);
       if (arr == null) {
         return false;
       }
 
-      lstAreas.add(new Object[]{start, arr[0], arr[1]});
+      lstAreas.add(arr);
     }
 
     //		try {
@@ -588,7 +597,7 @@ public class FinallyProcessor {
     //		} catch(Exception ex){ex.printStackTrace();}
 
     // delete areas
-    for (Object[] area : lstAreas) {
+    for (Area area : lstAreas) {
       deleteArea(graph, area);
     }
 
@@ -611,13 +620,25 @@ public class FinallyProcessor {
     return true;
   }
 
-  private Object[] compareSubgraphsEx(ControlFlowGraph graph,
-                                      BasicBlock startSample,
-                                      HashSet<BasicBlock> catchBlocks,
-                                      BasicBlock startCatch,
-                                      int finallytype,
-                                      HashMap<BasicBlock, Boolean> mapLast,
-                                      boolean skippedFirst) {
+  private static class Area {
+    private final BasicBlock start;
+    private final Set<BasicBlock> sample;
+    private final BasicBlock next;
+
+    private Area(BasicBlock start, Set<BasicBlock> sample, BasicBlock next) {
+      this.start = start;
+      this.sample = sample;
+      this.next = next;
+    }
+  }
+
+  private Area compareSubgraphsEx(ControlFlowGraph graph,
+                                  BasicBlock startSample,
+                                  HashSet<BasicBlock> catchBlocks,
+                                  BasicBlock startCatch,
+                                  int finallytype,
+                                  Map<BasicBlock, Boolean> mapLast,
+                                  boolean skippedFirst) {
 
     class BlockStackEntry {
       public BasicBlock blockCatch;
@@ -635,9 +656,9 @@ public class FinallyProcessor {
 
     List<BlockStackEntry> stack = new LinkedList<BlockStackEntry>();
 
-    HashSet<BasicBlock> setSample = new HashSet<BasicBlock>();
+    Set<BasicBlock> setSample = new HashSet<BasicBlock>();
 
-    HashMap<String, BasicBlock[]> mapNext = new HashMap<String, BasicBlock[]>();
+    Map<String, BasicBlock[]> mapNext = new HashMap<String, BasicBlock[]>();
 
     stack.add(new BlockStackEntry(startCatch, startSample, new ArrayList<int[]>()));
 
@@ -719,7 +740,7 @@ public class FinallyProcessor {
       }
 
       if (isLastBlock) {
-        HashSet<BasicBlock> setSuccs = new HashSet<BasicBlock>(blockSample.getSuccs());
+        Set<BasicBlock> setSuccs = new HashSet<BasicBlock>(blockSample.getSuccs());
         setSuccs.removeAll(setSample);
 
         for (BlockStackEntry stackent : stack) {
@@ -734,10 +755,10 @@ public class FinallyProcessor {
       }
     }
 
-    return new Object[]{setSample, getUniqueNext(graph, new HashSet<BasicBlock[]>(mapNext.values()))};
+    return new Area(startSample, setSample, getUniqueNext(graph, new HashSet<BasicBlock[]>(mapNext.values())));
   }
 
-  private BasicBlock getUniqueNext(ControlFlowGraph graph, HashSet<BasicBlock[]> setNext) {
+  private static BasicBlock getUniqueNext(ControlFlowGraph graph, Set<BasicBlock[]> setNext) {
 
     // precondition: there is at most one true exit path in a finally statement
 
@@ -784,7 +805,7 @@ public class FinallyProcessor {
                   return null;
                 }
 
-                for (int j = 0; i < instrNext.getOperands().length; j++) {
+                for (int j = 0; j < instrNext.getOperands().length; j++) {
                   if (instrNext.getOperand(j) != instrBlock.getOperand(j)) {
                     return null;
                   }
@@ -889,7 +910,7 @@ public class FinallyProcessor {
 
       graph.getBlocks().addWithKey(newblock, newblock.id);
 
-      HashSet<BasicBlock> setFinallyExits = graph.getFinallyExits();
+      Set<BasicBlock> setFinallyExits = graph.getFinallyExits();
       if (setFinallyExits.contains(sample)) {
         setFinallyExits.remove(sample);
         setFinallyExits.add(newblock);
@@ -939,10 +960,10 @@ public class FinallyProcessor {
     return true;
   }
 
-  private void deleteArea(ControlFlowGraph graph, Object[] area) {
+  private static void deleteArea(ControlFlowGraph graph, Area area) {
 
-    BasicBlock start = (BasicBlock)area[0];
-    BasicBlock next = (BasicBlock)area[2];
+    BasicBlock start = area.start;
+    BasicBlock next = area.next;
 
     if (start == next) {
       return;
@@ -954,23 +975,23 @@ public class FinallyProcessor {
     }
 
     // collect common exception ranges of predecessors and successors
-    HashSet<BasicBlock> setCommonExceptionHandlers = new HashSet<BasicBlock>(next.getSuccExceptions());
+    Set<BasicBlock> setCommonExceptionHandlers = new HashSet<BasicBlock>(next.getSuccExceptions());
     for (BasicBlock pred : start.getPreds()) {
       setCommonExceptionHandlers.retainAll(pred.getSuccExceptions());
     }
 
     boolean is_outside_range = false;
 
-    HashSet<BasicBlock> setPredecessors = new HashSet<BasicBlock>(start.getPreds());
+    Set<BasicBlock> setPredecessors = new HashSet<BasicBlock>(start.getPreds());
 
     // replace start with next
     for (BasicBlock pred : setPredecessors) {
       pred.replaceSuccessor(start, next);
     }
 
-    HashSet<BasicBlock> setBlocks = (HashSet<BasicBlock>)area[1];
+    Set<BasicBlock> setBlocks = area.sample;
 
-    HashSet<ExceptionRangeCFG> setCommonRemovedExceptionRanges = null;
+    Set<ExceptionRangeCFG> setCommonRemovedExceptionRanges = null;
 
     // remove all the blocks inbetween
     for (BasicBlock block : setBlocks) {
@@ -983,7 +1004,7 @@ public class FinallyProcessor {
           is_outside_range = true;
         }
 
-        HashSet<ExceptionRangeCFG> setRemovedExceptionRanges = new HashSet<ExceptionRangeCFG>();
+        Set<ExceptionRangeCFG> setRemovedExceptionRanges = new HashSet<ExceptionRangeCFG>();
         for (BasicBlock handler : block.getSuccExceptions()) {
           setRemovedExceptionRanges.add(graph.getExceptionRange(handler, block));
         }
@@ -1036,7 +1057,7 @@ public class FinallyProcessor {
     }
   }
 
-  private void removeExceptionInstructionsEx(BasicBlock block, int blocktype, int finallytype) {
+  private static void removeExceptionInstructionsEx(BasicBlock block, int blocktype, int finallytype) {
 
     InstructionSequence seq = block.getSeq();
 
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/LabelHelper.java b/src/org/jetbrains/java/decompiler/modules/decompiler/LabelHelper.java
index 00da7ac..1f4b5ee 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/LabelHelper.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/LabelHelper.java
@@ -223,10 +223,8 @@ public class LabelHelper {
           processEdgesWithNext(ifstat.getFirst(), mapEdges, null);
         }
         else {
-          if (ifstat.getIfstat() != null) {
-            mapEdges = setExplicitEdges(ifstat.getIfstat());
-            processEdgesWithNext(ifstat.getIfstat(), mapEdges, null);
-          }
+          mapEdges = setExplicitEdges(ifstat.getIfstat());
+          processEdgesWithNext(ifstat.getIfstat(), mapEdges, null);
 
           HashMap<Statement, List<StatEdge>> mapEdges1 = null;
           if (ifstat.getElsestat() != null) {
@@ -422,17 +420,14 @@ public class LabelHelper {
     }
   }
 
-  private static HashSet<Statement>[] processStatementLabel(Statement stat) {
-
-    HashSet<Statement> setBreak = new HashSet<Statement>();
-    HashSet<Statement> setContinue = new HashSet<Statement>();
+  private static void processStatementLabel(Statement stat) {
+    processStatementLabel(stat, new HashSet<Statement>(), new HashSet<Statement>());
+  }
 
+  private static void processStatementLabel(Statement stat, Set<Statement> setBreak, Set<Statement> setContinue) {
     if (stat.getExprents() == null) {
       for (Statement st : stat.getStats()) {
-        HashSet<Statement>[] arr = processStatementLabel(st);
-
-        setBreak.addAll(arr[0]);
-        setContinue.addAll(arr[1]);
+        processStatementLabel(st, setBreak, setContinue);
       }
 
       boolean shieldtype = (stat.type == Statement.TYPE_DO || stat.type == Statement.TYPE_SWITCH);
@@ -456,8 +451,6 @@ public class LabelHelper {
 
     setBreak.add(stat);
     setContinue.add(stat);
-
-    return new HashSet[]{setBreak, setContinue};
   }
 
   public static void replaceContinueWithBreak(Statement stat) {
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/StackVarsProcessor.java b/src/org/jetbrains/java/decompiler/modules/decompiler/StackVarsProcessor.java
index e72c646..109490c 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/StackVarsProcessor.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/StackVarsProcessor.java
@@ -110,7 +110,7 @@ public class StackVarsProcessor {
     setVersionsToNull(root);
   }
 
-  private void setVersionsToNull(Statement stat) {
+  private static void setVersionsToNull(Statement stat) {
 
     if (stat.getExprents() == null) {
       for (Object obj : stat.getSequentialObjects()) {
@@ -129,7 +129,7 @@ public class StackVarsProcessor {
     }
   }
 
-  private void setExprentVersionsToNull(Exprent exprent) {
+  private static void setExprentVersionsToNull(Exprent exprent) {
 
     List<Exprent> lst = exprent.getAllExprents(true);
     lst.add(exprent);
@@ -236,7 +236,7 @@ public class StackVarsProcessor {
   }
 
 
-  private Exprent isReplaceableVar(Exprent exprent, HashMap<VarVersionPaar, Exprent> mapVarValues, SSAUConstructorSparseEx ssau) {
+  private static Exprent isReplaceableVar(Exprent exprent, HashMap<VarVersionPaar, Exprent> mapVarValues, SSAUConstructorSparseEx ssau) {
 
     Exprent dest = null;
 
@@ -248,7 +248,7 @@ public class StackVarsProcessor {
     return dest;
   }
 
-  private void replaceSingleVar(Exprent parent, VarExprent var, Exprent dest, SSAUConstructorSparseEx ssau) {
+  private static void replaceSingleVar(Exprent parent, VarExprent var, Exprent dest, SSAUConstructorSparseEx ssau) {
 
     parent.replaceExprent(var, dest);
 
@@ -438,7 +438,7 @@ public class StackVarsProcessor {
     }
   }
 
-  private HashSet<VarVersionPaar> getAllVersions(Exprent exprent) {
+  private static HashSet<VarVersionPaar> getAllVersions(Exprent exprent) {
 
     HashSet<VarVersionPaar> res = new HashSet<VarVersionPaar>();
 
@@ -455,11 +455,11 @@ public class StackVarsProcessor {
     return res;
   }
 
-  private Object[] iterateChildExprent(Exprent exprent,
-                                       Exprent parent,
-                                       Exprent next,
-                                       HashMap<VarVersionPaar, Exprent> mapVarValues,
-                                       SSAUConstructorSparseEx ssau) {
+  private static Object[] iterateChildExprent(Exprent exprent,
+                                              Exprent parent,
+                                              Exprent next,
+                                              HashMap<VarVersionPaar, Exprent> mapVarValues,
+                                              SSAUConstructorSparseEx ssau) {
 
     boolean changed = false;
 
@@ -589,7 +589,7 @@ public class StackVarsProcessor {
     return new Object[]{null, changed, false};
   }
 
-  private boolean getUsedVersions(SSAUConstructorSparseEx ssa, VarVersionPaar var, List<VarVersionNode> res) {
+  private static boolean getUsedVersions(SSAUConstructorSparseEx ssa, VarVersionPaar var, List<VarVersionNode> res) {
 
     VarVersionsGraph ssuversions = ssa.getSsuversions();
     VarVersionNode varnode = ssuversions.nodes.getWithKey(var);
@@ -638,10 +638,10 @@ public class StackVarsProcessor {
     return !setNotDoms.isEmpty();
   }
 
-  private boolean isVersionToBeReplaced(VarVersionPaar usedvar,
-                                        HashMap<Integer, HashSet<VarVersionPaar>> mapVars,
-                                        SSAUConstructorSparseEx ssau,
-                                        VarVersionPaar leftpaar) {
+  private static boolean isVersionToBeReplaced(VarVersionPaar usedvar,
+                                               HashMap<Integer, HashSet<VarVersionPaar>> mapVars,
+                                               SSAUConstructorSparseEx ssau,
+                                               VarVersionPaar leftpaar) {
 
     VarVersionsGraph ssuversions = ssau.getSsuversions();
 
@@ -687,9 +687,9 @@ public class StackVarsProcessor {
     return true;
   }
 
-  private HashMap<Integer, HashSet<VarVersionPaar>> getAllVarVersions(VarVersionPaar leftvar,
-                                                                      Exprent exprent,
-                                                                      SSAUConstructorSparseEx ssau) {
+  private static HashMap<Integer, HashSet<VarVersionPaar>> getAllVarVersions(VarVersionPaar leftvar,
+                                                                             Exprent exprent,
+                                                                             SSAUConstructorSparseEx ssau) {
 
     HashMap<Integer, HashSet<VarVersionPaar>> map = new HashMap<Integer, HashSet<VarVersionPaar>>();
     SFormsFastMapDirect mapLiveVars = ssau.getLiveVarVersionsMap(leftvar);
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/decompose/DominatorEngine.java b/src/org/jetbrains/java/decompiler/modules/decompiler/decompose/DominatorEngine.java
index 0980bee..aeab0d2 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/decompose/DominatorEngine.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/decompose/DominatorEngine.java
@@ -43,7 +43,7 @@ public class DominatorEngine {
     }
   }
 
-  private Integer getCommonIDom(Integer key1, Integer key2, VBStyleCollection<Integer, Integer> orderedIDoms) {
+  private static Integer getCommonIDom(Integer key1, Integer key2, VBStyleCollection<Integer, Integer> orderedIDoms) {
 
     if (key1 == null) {
       return key2;
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/decompose/GenericDominatorEngine.java b/src/org/jetbrains/java/decompiler/modules/decompiler/decompose/GenericDominatorEngine.java
index f77e950..c6eb357 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/decompose/GenericDominatorEngine.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/decompose/GenericDominatorEngine.java
@@ -45,7 +45,7 @@ public class GenericDominatorEngine {
     }
   }
 
-  private IGraphNode getCommonIDom(IGraphNode node1, IGraphNode node2, VBStyleCollection<IGraphNode, IGraphNode> orderedIDoms) {
+  private static IGraphNode getCommonIDom(IGraphNode node1, IGraphNode node2, VBStyleCollection<IGraphNode, IGraphNode> orderedIDoms) {
 
     IGraphNode nodeOld;
 
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/deobfuscator/ExceptionDeobfuscator.java b/src/org/jetbrains/java/decompiler/modules/decompiler/deobfuscator/ExceptionDeobfuscator.java
index b015230..7614807 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/deobfuscator/ExceptionDeobfuscator.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/deobfuscator/ExceptionDeobfuscator.java
@@ -32,16 +32,30 @@ import java.util.Map.Entry;
 
 public class ExceptionDeobfuscator {
 
+  private static class Range {
+    private final BasicBlock handler;
+    private final String uniqueStr;
+    private final Set<BasicBlock> protectedRange;
+    private final ExceptionRangeCFG rangeCFG;
+
+    private Range(BasicBlock handler, String uniqueStr, Set<BasicBlock> protectedRange, ExceptionRangeCFG rangeCFG) {
+      this.handler = handler;
+      this.uniqueStr = uniqueStr;
+      this.protectedRange = protectedRange;
+      this.rangeCFG = rangeCFG;
+    }
+  }
+
   public static void restorePopRanges(ControlFlowGraph graph) {
 
-    List<Object[]> lstRanges = new ArrayList<Object[]>();
+    List<Range> lstRanges = new ArrayList<Range>();
 
     // aggregate ranges
     for (ExceptionRangeCFG range : graph.getExceptions()) {
       boolean found = false;
-      for (Object[] arr : lstRanges) {
-        if (arr[0] == range.getHandler() && InterpreterUtil.equalObjects(range.getUniqueExceptionsString(), arr[1])) {
-          ((HashSet<BasicBlock>)arr[2]).addAll(range.getProtectedRange());
+      for (Range arr : lstRanges) {
+        if (arr.handler == range.getHandler() && InterpreterUtil.equalObjects(range.getUniqueExceptionsString(), arr.uniqueStr)) {
+          arr.protectedRange.addAll(range.getProtectedRange());
           found = true;
           break;
         }
@@ -49,37 +63,36 @@ public class ExceptionDeobfuscator {
 
       if (!found) {
         // doesn't matter, which range chosen
-        lstRanges.add(
-          new Object[]{range.getHandler(), range.getUniqueExceptionsString(), new HashSet<BasicBlock>(range.getProtectedRange()), range});
+        lstRanges.add(new Range(range.getHandler(), range.getUniqueExceptionsString(), new HashSet<BasicBlock>(range.getProtectedRange()), range));
       }
     }
 
     // process aggregated ranges
-    for (Object[] range : lstRanges) {
+    for (Range range : lstRanges) {
 
-      if (range[1] != null) {
+      if (range.uniqueStr != null) {
 
-        BasicBlock handler = (BasicBlock)range[0];
+        BasicBlock handler = range.handler;
         InstructionSequence seq = handler.getSeq();
 
-        Instruction firstinstr = null;
+        Instruction firstinstr;
         if (seq.length() > 0) {
           firstinstr = seq.getInstr(0);
 
           if (firstinstr.opcode == CodeConstants.opc_pop ||
               firstinstr.opcode == CodeConstants.opc_astore) {
-            HashSet<BasicBlock> setrange = new HashSet<BasicBlock>((HashSet<BasicBlock>)range[2]);
+            Set<BasicBlock> setrange = new HashSet<BasicBlock>(range.protectedRange);
 
-            for (Object[] range_super : lstRanges) { // finally or strict superset
+            for (Range range_super : lstRanges) { // finally or strict superset
 
               if (range != range_super) {
 
-                HashSet<BasicBlock> setrange_super = new HashSet<BasicBlock>((HashSet<BasicBlock>)range_super[2]);
+                Set<BasicBlock> setrange_super = new HashSet<BasicBlock>(range_super.protectedRange);
 
-                if (!setrange.contains(range_super[0]) && !setrange_super.contains(handler)
-                    && (range_super[1] == null || setrange_super.containsAll(setrange))) {
+                if (!setrange.contains(range_super.handler) && !setrange_super.contains(handler)
+                    && (range_super.uniqueStr == null || setrange_super.containsAll(setrange))) {
 
-                  if (range_super[1] == null) {
+                  if (range_super.uniqueStr == null) {
                     setrange_super.retainAll(setrange);
                   }
                   else {
@@ -129,11 +142,10 @@ public class ExceptionDeobfuscator {
                       seq.removeInstruction(0);
                     }
 
+                    newblock.addSuccessorException(range_super.handler);
+                    range_super.rangeCFG.getProtectedRange().add(newblock);
 
-                    newblock.addSuccessorException((BasicBlock)range_super[0]);
-                    ((ExceptionRangeCFG)range_super[3]).getProtectedRange().add(newblock);
-
-                    handler = ((ExceptionRangeCFG)range[3]).getHandler();
+                    handler = range.rangeCFG.getHandler();
                     seq = handler.getSeq();
                   }
                 }
@@ -147,7 +159,7 @@ public class ExceptionDeobfuscator {
 
   public static void insertEmptyExceptionHandlerBlocks(ControlFlowGraph graph) {
 
-    HashSet<BasicBlock> setVisited = new HashSet<BasicBlock>();
+    Set<BasicBlock> setVisited = new HashSet<BasicBlock>();
 
     for (ExceptionRangeCFG range : graph.getExceptions()) {
       BasicBlock handler = range.getHandler();
@@ -255,7 +267,7 @@ public class ExceptionDeobfuscator {
     List<BasicBlock> lstRes = new ArrayList<BasicBlock>();
 
     LinkedList<BasicBlock> stack = new LinkedList<BasicBlock>();
-    HashSet<BasicBlock> setVisited = new HashSet<BasicBlock>();
+    Set<BasicBlock> setVisited = new HashSet<BasicBlock>();
 
     BasicBlock handler = range.getHandler();
     stack.addFirst(handler);
@@ -285,22 +297,20 @@ public class ExceptionDeobfuscator {
 
   public static boolean hasObfuscatedExceptions(ControlFlowGraph graph) {
 
-    BasicBlock first = graph.getFirst();
-
-    HashMap<BasicBlock, HashSet<BasicBlock>> mapRanges = new HashMap<BasicBlock, HashSet<BasicBlock>>();
+    Map<BasicBlock, Set<BasicBlock>> mapRanges = new HashMap<BasicBlock, Set<BasicBlock>>();
     for (ExceptionRangeCFG range : graph.getExceptions()) {
-      HashSet<BasicBlock> set = mapRanges.get(range.getHandler());
+      Set<BasicBlock> set = mapRanges.get(range.getHandler());
       if (set == null) {
         mapRanges.put(range.getHandler(), set = new HashSet<BasicBlock>());
       }
       set.addAll(range.getProtectedRange());
     }
 
-    for (Entry<BasicBlock, HashSet<BasicBlock>> ent : mapRanges.entrySet()) {
-      HashSet<BasicBlock> setEntries = new HashSet<BasicBlock>();
+    for (Entry<BasicBlock, Set<BasicBlock>> ent : mapRanges.entrySet()) {
+      Set<BasicBlock> setEntries = new HashSet<BasicBlock>();
 
       for (BasicBlock block : ent.getValue()) {
-        HashSet<BasicBlock> setTemp = new HashSet<BasicBlock>(block.getPreds());
+        Set<BasicBlock> setTemp = new HashSet<BasicBlock>(block.getPreds());
         setTemp.removeAll(ent.getValue());
 
         if (!setTemp.isEmpty()) {
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/AnnotationExprent.java b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/AnnotationExprent.java
index b919548..91de531 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/AnnotationExprent.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/AnnotationExprent.java
@@ -65,7 +65,7 @@ public class AnnotationExprent extends Exprent {
         String indstr1 = InterpreterUtil.getIndentString(indent + 1);
 
         for (int i = 0; i < parnames.size(); i++) {
-          buffer.append(new_line_separator + indstr1);
+          buffer.append(new_line_separator).append(indstr1);
           buffer.append(parnames.get(i));
           buffer.append(" = ");
           buffer.append(parvalues.get(i).toJava(indent + 2));
@@ -74,7 +74,7 @@ public class AnnotationExprent extends Exprent {
             buffer.append(",");
           }
         }
-        buffer.append(new_line_separator + indstr);
+        buffer.append(new_line_separator).append(indstr);
       }
 
       buffer.append(")");
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/ConstExprent.java b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/ConstExprent.java
index ae1747d..a45429a 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/ConstExprent.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/ConstExprent.java
@@ -116,7 +116,7 @@ public class ConstExprent extends Exprent {
     else {
       switch (consttype.type) {
         case CodeConstants.TYPE_BOOLEAN:
-          return new Boolean(((Integer)value).intValue() != 0).toString();
+          return Boolean.toString(((Integer)value).intValue() != 0);
         case CodeConstants.TYPE_CHAR:
           Integer val = (Integer)value;
           String ret = escapes.get(val);
@@ -267,7 +267,7 @@ public class ConstExprent extends Exprent {
     throw new RuntimeException("invalid constant type");
   }
 
-  private String convertStringToJava(String value, boolean ascii) {
+  private static String convertStringToJava(String value, boolean ascii) {
     char[] arr = value.toCharArray();
     StringBuilder buffer = new StringBuilder(arr.length);
 
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/FieldExprent.java b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/FieldExprent.java
index 652f61f..d57fcac 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/FieldExprent.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/FieldExprent.java
@@ -94,7 +94,7 @@ public class FieldExprent extends Exprent {
   }
 
   public String toJava(int indent) {
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
 
     if (isStatic) {
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/FunctionExprent.java b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/FunctionExprent.java
index 844a7a9..4fa2ab3 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/FunctionExprent.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/FunctionExprent.java
@@ -568,7 +568,7 @@ public class FunctionExprent extends Exprent {
     return res;
   }
 
-  private VarType getMaxVarType(VarType[] arr) {
+  private static VarType getMaxVarType(VarType[] arr) {
 
     int[] types = new int[]{CodeConstants.TYPE_DOUBLE, CodeConstants.TYPE_FLOAT, CodeConstants.TYPE_LONG};
     VarType[] vartypes = new VarType[]{VarType.VARTYPE_DOUBLE, VarType.VARTYPE_FLOAT, VarType.VARTYPE_LONG};
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/IfExprent.java b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/IfExprent.java
index 030fe9a..66e63c0 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/IfExprent.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/IfExprent.java
@@ -112,11 +112,7 @@ public class IfExprent extends Exprent {
   }
 
   public String toJava(int indent) {
-    StringBuffer buf = new StringBuffer("if(");
-    buf.append(condition.toJava(indent));
-    buf.append(")");
-
-    return buf.toString();
+    return "if(" + condition.toJava(indent) + ")";
   }
 
   public boolean equals(Object o) {
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/InvocationExprent.java b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/InvocationExprent.java
index c19052d..439d331 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/InvocationExprent.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/InvocationExprent.java
@@ -277,15 +277,15 @@ public class InvocationExprent extends Exprent {
           VarType leftType = new VarType(CodeConstants.TYPE_OBJECT, 0, classname);
 
           if (rightType.equals(VarType.VARTYPE_OBJECT) && !leftType.equals(rightType)) {
-            buf.append("((" + ExprProcessor.getCastTypeName(leftType) + ")");
+            buf.append("((").append(ExprProcessor.getCastTypeName(leftType)).append(")");
 
             if (instance.getPrecedence() >= FunctionExprent.getPrecedence(FunctionExprent.FUNCTION_CAST)) {
               res = "(" + res + ")";
             }
-            buf.append(res + ")");
+            buf.append(res).append(")");
           }
           else if (instance.getPrecedence() > getPrecedence()) {
-            buf.append("(" + res + ")");
+            buf.append("(").append(res).append(")");
           }
           else {
             buf.append(res);
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/NewExprent.java b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/NewExprent.java
index f71df1a..cd4fbbd 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/NewExprent.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/NewExprent.java
@@ -402,7 +402,7 @@ public class NewExprent extends Exprent {
     return buf.toString();
   }
 
-  private String getQualifiedNewInstance(String classname, List<Exprent> lstParams, int indent) {
+  private static String getQualifiedNewInstance(String classname, List<Exprent> lstParams, int indent) {
 
     ClassNode node = DecompilerContext.getClassprocessor().getMapRootClasses().get(classname);
 
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/VarExprent.java b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/VarExprent.java
index e589494..bef3631 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/exps/VarExprent.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/exps/VarExprent.java
@@ -115,7 +115,7 @@ public class VarExprent extends Exprent {
         if (processor != null && processor.getVarFinal(new VarVersionPaar(index, version)) == VarTypeProcessor.VAR_FINALEXPLICIT) {
           buf.append("final ");
         }
-        buf.append(ExprProcessor.getCastTypeName(getVartype()) + " ");
+        buf.append(ExprProcessor.getCastTypeName(getVartype())).append(" ");
       }
       buf.append(name == null ? ("var" + index + (version == 0 ? "" : "_" + version)) : name);
 
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/DirectGraph.java b/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/DirectGraph.java
index 2f4ed80..b24b72c 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/DirectGraph.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/DirectGraph.java
@@ -53,7 +53,7 @@ public class DirectGraph {
     }
   }
 
-  private void addToReversePostOrderListIterative(DirectNode root, List<DirectNode> lst) {
+  private static void addToReversePostOrderListIterative(DirectNode root, List<DirectNode> lst) {
 
     LinkedList<DirectNode> stackNode = new LinkedList<DirectNode>();
     LinkedList<Integer> stackIndex = new LinkedList<Integer>();
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/FlattenStatementsHelper.java b/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/FlattenStatementsHelper.java
index 27d3c9a..05d2f33 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/FlattenStatementsHelper.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/FlattenStatementsHelper.java
@@ -26,20 +26,19 @@ import java.util.Map.Entry;
 public class FlattenStatementsHelper {
 
   // statement.id, node.id(direct), node.id(continue)
-  private HashMap<Integer, String[]> mapDestinationNodes = new HashMap<Integer, String[]>();
+  private Map<Integer, String[]> mapDestinationNodes = new HashMap<Integer, String[]>();
 
   // node.id(source), statement.id(destination), edge type
   private List<Edge> listEdges = new ArrayList<Edge>();
 
   // node.id(exit), [node.id(source), statement.id(destination)]
-  public HashMap<String, List<String[]>> mapShortRangeFinallyPathIds = new HashMap<String, List<String[]>>();
+  private Map<String, List<String[]>> mapShortRangeFinallyPathIds = new HashMap<String, List<String[]>>();
 
   // node.id(exit), [node.id(source), statement.id(destination)]
-  public HashMap<String, List<String[]>> mapLongRangeFinallyPathIds = new HashMap<String, List<String[]>>();
+  private Map<String, List<String[]>> mapLongRangeFinallyPathIds = new HashMap<String, List<String[]>>();
 
   // positive if branches
-  public HashMap<String, String> mapPosIfBranch = new HashMap<String, String>();
-
+  private Map<String, Integer> mapPosIfBranch = new HashMap<String, Integer>();
 
   private DirectGraph graph;
 
@@ -99,7 +98,7 @@ public class FlattenStatementsHelper {
       LinkedList<StackEntry> stackFinally = statEntry.stackFinally;
       int statementBreakIndex = statEntry.statementIndex;
 
-      DirectNode node = null, nd = null;
+      DirectNode node, nd;
 
       List<StatEdge> lstSuccEdges = new ArrayList<StatEdge>();
       DirectNode sourcenode = null;
@@ -133,7 +132,7 @@ public class FlattenStatementsHelper {
 
             // 'if' statement: record positive branch
             if (stat.getLastBasicType() == Statement.LASTBASICTYPE_IF) {
-              mapPosIfBranch.put(sourcenode.id, lstSuccEdges.get(0).getDestination().id.toString());
+              mapPosIfBranch.put(sourcenode.id, lstSuccEdges.get(0).getDestination().id);
             }
 
             break;
@@ -485,7 +484,7 @@ public class FlattenStatementsHelper {
     }
   }
 
-  public HashMap<Integer, String[]> getMapDestinationNodes() {
+  public Map<Integer, String[]> getMapDestinationNodes() {
     return mapDestinationNodes;
   }
 
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/SSAConstructorSparseEx.java b/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/SSAConstructorSparseEx.java
index 5a6cb9d..2150f86 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/SSAConstructorSparseEx.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/SSAConstructorSparseEx.java
@@ -416,7 +416,7 @@ public class SSAConstructorSparseEx {
     return mapNew;
   }
 
-  private SFormsFastMapDirect mergeMaps(SFormsFastMapDirect mapTo, SFormsFastMapDirect map2) {
+  private static SFormsFastMapDirect mergeMaps(SFormsFastMapDirect mapTo, SFormsFastMapDirect map2) {
 
     if (map2 != null && !map2.isEmpty()) {
       mapTo.union(map2);
@@ -425,7 +425,7 @@ public class SSAConstructorSparseEx {
     return mapTo;
   }
 
-  private boolean mapsEqual(SFormsFastMapDirect map1, SFormsFastMapDirect map2) {
+  private static boolean mapsEqual(SFormsFastMapDirect map1, SFormsFastMapDirect map2) {
 
     if (map1 == null) {
       return map2 == null;
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/SSAUConstructorSparseEx.java b/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/SSAUConstructorSparseEx.java
index 9b1ce0e..97b6448 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/SSAUConstructorSparseEx.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/sforms/SSAUConstructorSparseEx.java
@@ -683,7 +683,7 @@ public class SSAUConstructorSparseEx {
     return mapNew;
   }
 
-  private SFormsFastMapDirect mergeMaps(SFormsFastMapDirect mapTo, SFormsFastMapDirect map2) {
+  private static SFormsFastMapDirect mergeMaps(SFormsFastMapDirect mapTo, SFormsFastMapDirect map2) {
 
     if (map2 != null && !map2.isEmpty()) {
       mapTo.union(map2);
@@ -692,7 +692,7 @@ public class SSAUConstructorSparseEx {
     return mapTo;
   }
 
-  private boolean mapsEqual(SFormsFastMapDirect map1, SFormsFastMapDirect map2) {
+  private static boolean mapsEqual(SFormsFastMapDirect map1, SFormsFastMapDirect map2) {
 
     if (map1 == null) {
       return map2 == null;
@@ -789,7 +789,7 @@ public class SSAUConstructorSparseEx {
     return map;
   }
 
-  private Integer getFirstProtectedRange(Statement stat) {
+  private static Integer getFirstProtectedRange(Statement stat) {
 
     while (true) {
       Statement parent = stat.getParent();
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/CatchAllStatement.java b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/CatchAllStatement.java
index f2b6bc4..cf57d98 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/CatchAllStatement.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/CatchAllStatement.java
@@ -116,13 +116,13 @@ public class CatchAllStatement extends Statement {
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
     buf.append(ExprProcessor.listToJava(varDefinitions, indent));
 
     boolean labeled = isLabeled();
     if (labeled) {
-      buf.append(indstr + "label" + this.id + ":" + new_line_separator);
+      buf.append(indstr).append("label").append(this.id).append(":").append(new_line_separator);
     }
 
     List<StatEdge> lstSuccs = first.getSuccessorEdges(STATEDGE_DIRECT_ALL);
@@ -134,26 +134,26 @@ public class CatchAllStatement extends Statement {
       buf.append(content);
     }
     else {
-      buf.append(indstr + "try {" + new_line_separator);
+      buf.append(indstr).append("try {").append(new_line_separator);
       buf.append(ExprProcessor.jmpWrapper(first, indent + 1, true));
-      buf.append(indstr + "}");
+      buf.append(indstr).append("}");
     }
 
-    buf.append((isFinally ? " finally" :
-                " catch (" + vars.get(0).toJava(indent) + ")") + " {" + new_line_separator);
+    buf.append(isFinally ? " finally" :
+               " catch (" + vars.get(0).toJava(indent) + ")").append(" {").append(new_line_separator);
 
     if (monitor != null) {
       indstr1 = InterpreterUtil.getIndentString(indent + 1);
-      buf.append(indstr1 + "if(" + monitor.toJava(indent) + ") {" + new_line_separator);
+      buf.append(indstr1).append("if(").append(monitor.toJava(indent)).append(") {").append(new_line_separator);
     }
 
     buf.append(ExprProcessor.jmpWrapper(handler, indent + 1 + (monitor != null ? 1 : 0), true));
 
     if (monitor != null) {
-      buf.append(indstr1 + "}" + new_line_separator);
+      buf.append(indstr1).append("}").append(new_line_separator);
     }
 
-    buf.append(indstr + "}" + new_line_separator);
+    buf.append(indstr).append("}").append(new_line_separator);
 
     return buf.toString();
   }
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/CatchStatement.java b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/CatchStatement.java
index 17f5636..c251d05 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/CatchStatement.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/CatchStatement.java
@@ -151,19 +151,19 @@ public class CatchStatement extends Statement {
 
   public String toJava(int indent) {
     String indstr = InterpreterUtil.getIndentString(indent);
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
     buf.append(ExprProcessor.listToJava(varDefinitions, indent));
 
     if (isLabeled()) {
-      buf.append(indstr + "label" + this.id + ":" + new_line_separator);
+      buf.append(indstr).append("label").append(this.id).append(":").append(new_line_separator);
     }
 
-    buf.append(indstr + "try {" + new_line_separator);
+    buf.append(indstr).append("try {").append(new_line_separator);
     buf.append(ExprProcessor.jmpWrapper(first, indent + 1, true));
-    buf.append(indstr + "}");
+    buf.append(indstr).append("}");
 
     for (int i = 1; i < stats.size(); i++) {
       List<String> exception_types = exctstrings.get(i - 1);
@@ -174,11 +174,12 @@ public class CatchStatement extends Statement {
           VarType exc_type = new VarType(CodeConstants.TYPE_OBJECT, 0, exception_types.get(exc_index));
           String exc_type_name = ExprProcessor.getCastTypeName(exc_type);
 
-          buf.append(exc_type_name + " | ");
+          buf.append(exc_type_name).append(" | ");
         }
       }
       buf.append(vars.get(i - 1).toJava(indent));
-      buf.append(") {" + new_line_separator + ExprProcessor.jmpWrapper(stats.get(i), indent + 1, true) + indstr + "}");
+      buf.append(") {").append(new_line_separator).append(ExprProcessor.jmpWrapper(stats.get(i), indent + 1, true)).append(indstr)
+        .append("}");
     }
     buf.append(new_line_separator);
 
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/DoStatement.java b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/DoStatement.java
index 2bd8e3a..7c152c2 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/DoStatement.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/DoStatement.java
@@ -93,37 +93,38 @@ public class DoStatement extends Statement {
 
   public String toJava(int indent) {
     String indstr = InterpreterUtil.getIndentString(indent);
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
     buf.append(ExprProcessor.listToJava(varDefinitions, indent));
 
     if (isLabeled()) {
-      buf.append(indstr + "label" + this.id + ":" + new_line_separator);
+      buf.append(indstr).append("label").append(this.id).append(":").append(new_line_separator);
     }
 
     switch (looptype) {
       case LOOP_DO:
-        buf.append(indstr + "while(true) {" + new_line_separator);
+        buf.append(indstr).append("while(true) {").append(new_line_separator);
         buf.append(ExprProcessor.jmpWrapper(first, indent + 1, true));
-        buf.append(indstr + "}" + new_line_separator);
+        buf.append(indstr).append("}").append(new_line_separator);
         break;
       case LOOP_DOWHILE:
-        buf.append(indstr + "do {" + new_line_separator);
+        buf.append(indstr).append("do {").append(new_line_separator);
         buf.append(ExprProcessor.jmpWrapper(first, indent + 1, true));
-        buf.append(indstr + "} while(" + conditionExprent.get(0).toJava(indent) + ");" + new_line_separator);
+        buf.append(indstr).append("} while(").append(conditionExprent.get(0).toJava(indent)).append(");").append(new_line_separator);
         break;
       case LOOP_WHILE:
-        buf.append(indstr + "while(" + conditionExprent.get(0).toJava(indent) + ") {" + new_line_separator);
+        buf.append(indstr).append("while(").append(conditionExprent.get(0).toJava(indent)).append(") {").append(new_line_separator);
         buf.append(ExprProcessor.jmpWrapper(first, indent + 1, true));
-        buf.append(indstr + "}" + new_line_separator);
+        buf.append(indstr).append("}").append(new_line_separator);
         break;
       case LOOP_FOR:
-        buf.append(indstr + "for(" + (initExprent.get(0) == null ? "" : initExprent.get(0).toJava(indent)) +
-                   "; " + conditionExprent.get(0).toJava(indent) + "; " + incExprent.get(0).toJava(indent) + ") {" + new_line_separator);
+        buf.append(indstr).append("for(").append(initExprent.get(0) == null ? "" : initExprent.get(0).toJava(indent)).append("; ")
+          .append(conditionExprent.get(0).toJava(indent)).append("; ").append(incExprent.get(0).toJava(indent)).append(") {")
+          .append(new_line_separator);
         buf.append(ExprProcessor.jmpWrapper(first, indent + 1, true));
-        buf.append(indstr + "}" + new_line_separator);
+        buf.append(indstr).append("}").append(new_line_separator);
     }
 
     return buf.toString();
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/GeneralStatement.java b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/GeneralStatement.java
index 9988881..a11171e 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/GeneralStatement.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/GeneralStatement.java
@@ -55,19 +55,19 @@ public class GeneralStatement extends Statement {
 
   public String toJava(int indent) {
     String indstr = InterpreterUtil.getIndentString(indent);
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
     if (isLabeled()) {
-      buf.append(indstr + "label" + this.id + ":" + new_line_separator);
+      buf.append(indstr).append("label").append(this.id).append(":").append(new_line_separator);
     }
 
-    buf.append(indstr + "abstract statement {" + new_line_separator);
+    buf.append(indstr).append("abstract statement {").append(new_line_separator);
     for (int i = 0; i < stats.size(); i++) {
       buf.append(stats.get(i).toJava(indent + 1));
     }
-    buf.append(indstr + "}");
+    buf.append(indstr).append("}");
 
     return buf.toString();
   }
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/IfStatement.java b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/IfStatement.java
index 0b05981..9ad8125 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/IfStatement.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/IfStatement.java
@@ -201,7 +201,7 @@ public class IfStatement extends Statement {
 
   public String toJava(int indent) {
     String indstr = InterpreterUtil.getIndentString(indent);
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
@@ -209,10 +209,10 @@ public class IfStatement extends Statement {
     buf.append(first.toJava(indent));
 
     if (isLabeled()) {
-      buf.append(indstr + "label" + this.id + ":" + new_line_separator);
+      buf.append(indstr).append("label").append(this.id).append(":").append(new_line_separator);
     }
 
-    buf.append(indstr + headexprent.get(0).toJava(indent) + " {" + new_line_separator);
+    buf.append(indstr).append(headexprent.get(0).toJava(indent)).append(" {").append(new_line_separator);
 
     if (ifstat == null) {
       buf.append(InterpreterUtil.getIndentString(indent + 1));
@@ -228,10 +228,10 @@ public class IfStatement extends Statement {
         }
 
         if (ifedge.labeled) {
-          buf.append(" label" + ifedge.closure.id);
+          buf.append(" label").append(ifedge.closure.id);
         }
       }
-      buf.append(";" + new_line_separator);
+      buf.append(";").append(new_line_separator);
     }
     else {
       buf.append(ExprProcessor.jmpWrapper(ifstat, indent + 1, true));
@@ -248,7 +248,7 @@ public class IfStatement extends Statement {
         String content = ExprProcessor.jmpWrapper(elsestat, indent, false);
         content = content.substring(indstr.length());
 
-        buf.append(indstr + "} else ");
+        buf.append(indstr).append("} else ");
         buf.append(content);
 
         elseif = true;
@@ -257,14 +257,14 @@ public class IfStatement extends Statement {
         String content = ExprProcessor.jmpWrapper(elsestat, indent + 1, false);
 
         if (content.length() > 0) {
-          buf.append(indstr + "} else {" + new_line_separator);
+          buf.append(indstr).append("} else {").append(new_line_separator);
           buf.append(content);
         }
       }
     }
 
     if (!elseif) {
-      buf.append(indstr + "}" + new_line_separator);
+      buf.append(indstr).append("}").append(new_line_separator);
     }
 
     return buf.toString();
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SequenceStatement.java b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SequenceStatement.java
index d561b9e..eccce91 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SequenceStatement.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SequenceStatement.java
@@ -112,7 +112,7 @@ public class SequenceStatement extends Statement {
     if (islabeled) {
       indstr = InterpreterUtil.getIndentString(indent);
       indent++;
-      buf.append(indstr + "label" + this.id + ": {" + new_line_separator);
+      buf.append(indstr).append("label").append(this.id).append(": {").append(new_line_separator);
     }
 
     boolean notempty = false;
@@ -132,7 +132,7 @@ public class SequenceStatement extends Statement {
     }
 
     if (islabeled) {
-      buf.append(indstr + "}" + new_line_separator);
+      buf.append(indstr).append("}").append(new_line_separator);
     }
 
     return buf.toString();
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/Statement.java b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/Statement.java
index 52118d2..d707258 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/Statement.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/Statement.java
@@ -126,28 +126,21 @@ public class Statement {
     isMonitorEnter = false;
     containsMonitorExit = false;
 
-    for (Map<Integer, List<StatEdge>> map : new Map[]{mapSuccEdges, mapPredEdges}) {
-      map.remove(StatEdge.TYPE_EXCEPTION);
+    processMap(mapSuccEdges);
+    processMap(mapPredEdges);
+    processMap(mapSuccStates);
+    processMap(mapPredStates);
+  }
 
-      List<StatEdge> lst = map.get(STATEDGE_DIRECT_ALL);
-      if (lst != null) {
-        map.put(STATEDGE_ALL, new ArrayList<StatEdge>(lst));
-      }
-      else {
-        map.remove(STATEDGE_ALL);
-      }
+  private static <T> void processMap(Map<Integer, List<T>> map) {
+    map.remove(StatEdge.TYPE_EXCEPTION);
+
+    List<T> lst = map.get(STATEDGE_DIRECT_ALL);
+    if (lst != null) {
+      map.put(STATEDGE_ALL, new ArrayList<T>(lst));
     }
-
-    for (Map<Integer, List<Statement>> map : new Map[]{mapSuccStates, mapPredStates}) {
-      map.remove(StatEdge.TYPE_EXCEPTION);
-
-      List<Statement> lst = map.get(STATEDGE_DIRECT_ALL);
-      if (lst != null) {
-        map.put(STATEDGE_ALL, new ArrayList<Statement>(lst));
-      }
-      else {
-        map.remove(STATEDGE_ALL);
-      }
+    else {
+      map.remove(STATEDGE_ALL);
     }
   }
 
@@ -579,7 +572,7 @@ public class Statement {
   // private methods
   // *****************************************************************************
 
-  private void addToReversePostOrderListIterative(Statement root, List<Statement> lst) {
+  private static void addToReversePostOrderListIterative(Statement root, List<Statement> lst) {
 
     LinkedList<Statement> stackNode = new LinkedList<Statement>();
     LinkedList<Integer> stackIndex = new LinkedList<Integer>();
@@ -622,7 +615,7 @@ public class Statement {
   }
 
 
-  private void addToPostReversePostOrderList(Statement stat, List<Statement> lst, HashSet<Statement> setVisited) {
+  private static void addToPostReversePostOrderList(Statement stat, List<Statement> lst, HashSet<Statement> setVisited) {
 
     if (setVisited.contains(stat)) { // because of not considered exception edges, s. isExitComponent. Should be rewritten, if possible.
       return;
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SwitchStatement.java b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SwitchStatement.java
index 379d00d..3d409f8 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SwitchStatement.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SwitchStatement.java
@@ -117,10 +117,10 @@ public class SwitchStatement extends Statement {
     buf.append(first.toJava(indent));
 
     if (isLabeled()) {
-      buf.append(indstr + "label" + this.id + ":" + new_line_separator);
+      buf.append(indstr).append("label").append(this.id).append(":").append(new_line_separator);
     }
 
-    buf.append(indstr + headexprent.get(0).toJava(indent) + " {" + new_line_separator);
+    buf.append(indstr).append(headexprent.get(0).toJava(indent)).append(" {").append(new_line_separator);
 
     VarType switch_type = headexprent.get(0).getExprType();
 
@@ -132,20 +132,20 @@ public class SwitchStatement extends Statement {
 
       for (int j = 0; j < edges.size(); j++) {
         if (edges.get(j) == default_edge) {
-          buf.append(indstr + "default:" + new_line_separator);
+          buf.append(indstr).append("default:").append(new_line_separator);
         }
         else {
           ConstExprent value = (ConstExprent)values.get(j).copy();
           value.setConsttype(switch_type);
 
-          buf.append(indstr + "case " + value.toJava(indent) + ":" + new_line_separator);
+          buf.append(indstr).append("case ").append(value.toJava(indent)).append(":").append(new_line_separator);
         }
       }
 
       buf.append(ExprProcessor.jmpWrapper(stat, indent + 1, false));
     }
 
-    buf.append(indstr + "}" + new_line_separator);
+    buf.append(indstr).append("}").append(new_line_separator);
 
     return buf.toString();
   }
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SynchronizedStatement.java b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SynchronizedStatement.java
index 3fcb042..6e3dc47 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SynchronizedStatement.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/SynchronizedStatement.java
@@ -73,17 +73,17 @@ public class SynchronizedStatement extends Statement {
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();
 
-    StringBuffer buf = new StringBuffer();
+    StringBuilder buf = new StringBuilder();
     buf.append(ExprProcessor.listToJava(varDefinitions, indent));
     buf.append(first.toJava(indent));
 
     if (isLabeled()) {
-      buf.append(indstr + "label" + this.id + ":" + new_line_separator);
+      buf.append(indstr).append("label").append(this.id).append(":").append(new_line_separator);
     }
 
-    buf.append(indstr + headexprent.get(0).toJava(indent) + " {" + new_line_separator);
+    buf.append(indstr).append(headexprent.get(0).toJava(indent)).append(" {").append(new_line_separator);
     buf.append(ExprProcessor.jmpWrapper(body, indent + 1, true));
-    buf.append(indstr + "}" + new_line_separator);
+    buf.append(indstr).append("}").append(new_line_separator);
 
     return buf.toString();
   }
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/vars/CheckTypesResult.java b/src/org/jetbrains/java/decompiler/modules/decompiler/vars/CheckTypesResult.java
index 6e7c967..08c32ec 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/vars/CheckTypesResult.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/vars/CheckTypesResult.java
@@ -43,7 +43,7 @@ public class CheckTypesResult {
     return lstMinTypeExprents;
   }
 
-  public class ExprentTypePair {
+  public static class ExprentTypePair {
     public Exprent exprent;
     public VarType type;
     public VarType desttype;
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarDefinitionHelper.java b/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarDefinitionHelper.java
index 1c52517..9582bfb 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarDefinitionHelper.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarDefinitionHelper.java
@@ -125,10 +125,7 @@ public class VarDefinitionHelper {
 
     VarNamesCollector vc = DecompilerContext.getVarncollector();
 
-    Iterator<Entry<Integer, Statement>> it = mapVarDefStatements.entrySet().iterator();
-    while (it.hasNext()) {
-      Entry<Integer, Statement> en = it.next();
-
+    for (Entry<Integer, Statement> en : mapVarDefStatements.entrySet()) {
       Statement stat = en.getValue();
       Integer index = en.getKey();
 
@@ -312,9 +309,7 @@ public class VarDefinitionHelper {
     HashSet<Integer> set = new HashSet<Integer>(mapCount.keySet());
 
     // put all variables defined in this statement into the set
-    Iterator<Entry<Integer, Integer>> itMult = mapCount.entrySet().iterator();
-    while (itMult.hasNext()) {
-      Entry<Integer, Integer> en = itMult.next();
+    for (Entry<Integer, Integer> en : mapCount.entrySet()) {
       if (en.getValue().intValue() > 1) {
         mapVarDefStatements.put(en.getKey(), stat);
       }
@@ -325,7 +320,7 @@ public class VarDefinitionHelper {
     return set;
   }
 
-  private List<VarExprent> getAllVars(List<Exprent> lst) {
+  private static List<VarExprent> getAllVars(List<Exprent> lst) {
 
     List<VarExprent> res = new ArrayList<VarExprent>();
     List<Exprent> listTemp = new ArrayList<Exprent>();
@@ -344,7 +339,7 @@ public class VarDefinitionHelper {
     return res;
   }
 
-  private boolean setDefinition(Exprent expr, Integer index) {
+  private static boolean setDefinition(Exprent expr, Integer index) {
     if (expr.type == Exprent.EXPRENT_ASSIGNMENT) {
       Exprent left = ((AssignmentExprent)expr).getLeft();
       if (left.type == Exprent.EXPRENT_VAR) {
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarTypeProcessor.java b/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarTypeProcessor.java
index 8792f3e..d7d3d2e 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarTypeProcessor.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarTypeProcessor.java
@@ -102,7 +102,7 @@ public class VarTypeProcessor {
     while (!processVarTypes(dgraph)) ;
   }
 
-  private void resetExprentTypes(DirectGraph dgraph) {
+  private static void resetExprentTypes(DirectGraph dgraph) {
 
     dgraph.iterateExprents(new DirectGraph.ExprentIterator() {
       public int processExprent(Exprent exprent) {
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarVersionsGraph.java b/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarVersionsGraph.java
index ce05071..f839a05 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarVersionsGraph.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarVersionsGraph.java
@@ -106,7 +106,7 @@ public class VarVersionsGraph {
     engine.initialize();
   }
 
-  private LinkedList<VarVersionNode> getReversedPostOrder(Collection<VarVersionNode> roots) {
+  private static LinkedList<VarVersionNode> getReversedPostOrder(Collection<VarVersionNode> roots) {
 
     LinkedList<VarVersionNode> lst = new LinkedList<VarVersionNode>();
     HashSet<VarVersionNode> setVisited = new HashSet<VarVersionNode>();
@@ -122,7 +122,7 @@ public class VarVersionsGraph {
     return lst;
   }
 
-  private void addToReversePostOrderListIterative(VarVersionNode root, List<VarVersionNode> lst, HashSet<VarVersionNode> setVisited) {
+  private static void addToReversePostOrderListIterative(VarVersionNode root, List<VarVersionNode> lst, HashSet<VarVersionNode> setVisited) {
 
     HashMap<VarVersionNode, List<VarVersionEdge>> mapNodeSuccs = new HashMap<VarVersionNode, List<VarVersionEdge>>();
 
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarVersionsProcessor.java b/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarVersionsProcessor.java
index 4093992..46c6a03 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarVersionsProcessor.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarVersionsProcessor.java
@@ -66,7 +66,7 @@ public class VarVersionsProcessor {
     setNewVarIndices(typeproc, dgraph);
   }
 
-  private void mergePhiVersions(SSAConstructorSparseEx ssa, DirectGraph dgraph) {
+  private static void mergePhiVersions(SSAConstructorSparseEx ssa, DirectGraph dgraph) {
 
     // collect phi versions
     List<HashSet<VarVersionPaar>> lst = new ArrayList<HashSet<VarVersionPaar>>();
@@ -125,7 +125,7 @@ public class VarVersionsProcessor {
     });
   }
 
-  private void eliminateNonJavaTypes(VarTypeProcessor typeproc) {
+  private static void eliminateNonJavaTypes(VarTypeProcessor typeproc) {
 
     HashMap<VarVersionPaar, VarType> mapExprentMaxTypes = typeproc.getMapExprentMaxTypes();
     HashMap<VarVersionPaar, VarType> mapExprentMinTypes = typeproc.getMapExprentMinTypes();
@@ -152,7 +152,7 @@ public class VarVersionsProcessor {
     }
   }
 
-  private void simpleMerge(VarTypeProcessor typeproc, DirectGraph dgraph, StructMethod mt) {
+  private static void simpleMerge(VarTypeProcessor typeproc, DirectGraph dgraph, StructMethod mt) {
 
     HashMap<VarVersionPaar, VarType> mapExprentMaxTypes = typeproc.getMapExprentMaxTypes();
     HashMap<VarVersionPaar, VarType> mapExprentMinTypes = typeproc.getMapExprentMinTypes();
diff --git a/src/org/jetbrains/java/decompiler/modules/renamer/IdentifierConverter.java b/src/org/jetbrains/java/decompiler/modules/renamer/IdentifierConverter.java
index c8ec379..546ece3 100644
--- a/src/org/jetbrains/java/decompiler/modules/renamer/IdentifierConverter.java
+++ b/src/org/jetbrains/java/decompiler/modules/renamer/IdentifierConverter.java
@@ -193,11 +193,12 @@ public class IdentifierConverter {
     }
 
     String classOldFullName = cl.qualifiedName;
-    String classNewFullName = classOldFullName;
 
     // TODO: rename packages
     String clsimplename = ConverterHelper.getSimpleClassName(classOldFullName);
     if (helper.toBeRenamed(IIdentifierRenamer.ELEMENT_CLASS, clsimplename, null, null)) {
+      String classNewFullName;
+
       do {
         classNewFullName = ConverterHelper.replaceSimpleClassName(classOldFullName,
                                                                   helper.getNextClassname(classOldFullName, ConverterHelper
@@ -339,7 +340,7 @@ public class IdentifierConverter {
     return descriptor;
   }
 
-  private List<ClassWrapperNode> getReversePostOrderListIterative(List<ClassWrapperNode> roots) {
+  private static List<ClassWrapperNode> getReversePostOrderListIterative(List<ClassWrapperNode> roots) {
 
     List<ClassWrapperNode> res = new ArrayList<ClassWrapperNode>();
 
diff --git a/src/org/jetbrains/java/decompiler/struct/StructMethod.java b/src/org/jetbrains/java/decompiler/struct/StructMethod.java
index 08101d2..e3de510 100644
--- a/src/org/jetbrains/java/decompiler/struct/StructMethod.java
+++ b/src/org/jetbrains/java/decompiler/struct/StructMethod.java
@@ -216,8 +216,11 @@ public class StructMethod implements CodeConstants {
     }
   }
 
-  private void readAttribute(DataInputFullStream in, ConstantPool pool, VBStyleCollection<StructGeneralAttribute, String> lstAttribute,
-                             int attr_nameindex, String attrname) throws IOException {
+  private static void readAttribute(DataInputFullStream in,
+                                    ConstantPool pool,
+                                    VBStyleCollection<StructGeneralAttribute, String> lstAttribute,
+                                    int attr_nameindex,
+                                    String attrname) throws IOException {
 
     StructGeneralAttribute attribute = StructGeneralAttribute.getMatchingAttributeInstance(attr_nameindex, attrname);
 
diff --git a/src/org/jetbrains/java/decompiler/struct/consts/ConstantPool.java b/src/org/jetbrains/java/decompiler/struct/consts/ConstantPool.java
index a352213..1b21828 100644
--- a/src/org/jetbrains/java/decompiler/struct/consts/ConstantPool.java
+++ b/src/org/jetbrains/java/decompiler/struct/consts/ConstantPool.java
@@ -252,7 +252,7 @@ public class ConstantPool {
           buffer.append("[");
         }
 
-        buffer.append("L" + newname + ";");
+        buffer.append("L").append(newname).append(";");
       }
       else {
         buffer.append(newname);
diff --git a/src/org/jetbrains/java/decompiler/struct/gen/VarType.java b/src/org/jetbrains/java/decompiler/struct/gen/VarType.java
index 1b6ff99..a58898a 100644
--- a/src/org/jetbrains/java/decompiler/struct/gen/VarType.java
+++ b/src/org/jetbrains/java/decompiler/struct/gen/VarType.java
@@ -306,7 +306,7 @@ public class VarType {  // TODO: optimize switch
     }
   }
 
-  private int getType(char c) {
+  private static int getType(char c) {
     switch (c) {
       case 'B':
         return CodeConstants.TYPE_BYTE;
@@ -343,7 +343,7 @@ public class VarType {  // TODO: optimize switch
     }
   }
 
-  private String getChar(int type) {
+  private static String getChar(int type) {
     switch (type) {
       case CodeConstants.TYPE_BYTE:
         return "B";
diff --git a/src/org/jetbrains/java/decompiler/struct/gen/generics/GenericMain.java b/src/org/jetbrains/java/decompiler/struct/gen/generics/GenericMain.java
index 6a4f52e..a2df8f5 100644
--- a/src/org/jetbrains/java/decompiler/struct/gen/generics/GenericMain.java
+++ b/src/org/jetbrains/java/decompiler/struct/gen/generics/GenericMain.java
@@ -221,7 +221,7 @@ public class GenericMain {
 
     String res = name.replace('/', '.');
 
-    if (res.indexOf("$") >= 0) {
+    if (res.contains("$")) {
       StructClass cl = DecompilerContext.getStructcontext().getClass(name);
       if (cl == null || !cl.isOwn()) {
         res = res.replace('$', '.');
diff --git a/src/org/jetbrains/java/decompiler/struct/gen/generics/GenericType.java b/src/org/jetbrains/java/decompiler/struct/gen/generics/GenericType.java
index 61d07a0..160a0ac 100644
--- a/src/org/jetbrains/java/decompiler/struct/gen/generics/GenericType.java
+++ b/src/org/jetbrains/java/decompiler/struct/gen/generics/GenericType.java
@@ -105,7 +105,7 @@ public class GenericType {
     }
   }
 
-  private String getNextClassSignature(String value) {
+  private static String getNextClassSignature(String value) {
 
     int counter = 0;
     int index = 0;
@@ -131,7 +131,7 @@ public class GenericType {
     return value.substring(0, index);
   }
 
-  private void parseArgumentsList(String value, GenericType type) {
+  private static void parseArgumentsList(String value, GenericType type) {
 
     if (value == null) {
       return;
@@ -214,7 +214,7 @@ public class GenericType {
     return value.substring(0, index + 1);
   }
 
-  private int getType(char c) {
+  private static int getType(char c) {
     switch (c) {
       case 'B':
         return CodeConstants.TYPE_BYTE;
diff --git a/src/org/jetbrains/java/decompiler/struct/lazy/LazyLoader.java b/src/org/jetbrains/java/decompiler/struct/lazy/LazyLoader.java
index ad87235..8673c21 100644
--- a/src/org/jetbrains/java/decompiler/struct/lazy/LazyLoader.java
+++ b/src/org/jetbrains/java/decompiler/struct/lazy/LazyLoader.java
@@ -158,7 +158,7 @@ public class LazyLoader {
     return link == null ? null : getClassStream(link.externPath, link.internPath);
   }
 
-  private void skipAttributes(DataInputFullStream in) throws IOException {
+  private static void skipAttributes(DataInputFullStream in) throws IOException {
 
     int length = in.readUnsignedShort();
     for (int i = 0; i < length; i++) {
diff --git a/src/org/jetbrains/java/decompiler/util/FastSparseSetFactory.java b/src/org/jetbrains/java/decompiler/util/FastSparseSetFactory.java
index 863dd72..bf01035 100644
--- a/src/org/jetbrains/java/decompiler/util/FastSparseSetFactory.java
+++ b/src/org/jetbrains/java/decompiler/util/FastSparseSetFactory.java
@@ -253,7 +253,7 @@ public class FastSparseSetFactory<E> {
       }
     }
 
-    private void changeNext(int[] arrnext, int key, int oldnext, int newnext) {
+    private static void changeNext(int[] arrnext, int key, int oldnext, int newnext) {
       for (int i = key - 1; i >= 0; i--) {
         if (arrnext[i] == oldnext) {
           arrnext[i] = newnext;
diff --git a/src/org/jetbrains/java/decompiler/util/InterpreterUtil.java b/src/org/jetbrains/java/decompiler/util/InterpreterUtil.java
index a1da87b..89e11c0 100644
--- a/src/org/jetbrains/java/decompiler/util/InterpreterUtil.java
+++ b/src/org/jetbrains/java/decompiler/util/InterpreterUtil.java
@@ -83,9 +83,8 @@ public class InterpreterUtil {
       return false;
     }
 
-    HashSet<?> set = new HashSet(c1);
+    HashSet<Object> set = new HashSet<Object>(c1);
     set.removeAll(c2);
-
     return (set.size() == 0);
   }
 
diff --git a/src/org/jetbrains/java/decompiler/util/SFormsFastMapDirect.java b/src/org/jetbrains/java/decompiler/util/SFormsFastMapDirect.java
index 089225d..996607a 100644
--- a/src/org/jetbrains/java/decompiler/util/SFormsFastMapDirect.java
+++ b/src/org/jetbrains/java/decompiler/util/SFormsFastMapDirect.java
@@ -27,7 +27,7 @@ public class SFormsFastMapDirect {
 
   private int size;
 
-  private FastSparseSet<Integer>[][] elements = new FastSparseSet[3][];
+  @SuppressWarnings("unchecked") private FastSparseSet<Integer>[][] elements = new FastSparseSet[3][];
 
   private int[][] next = new int[3][];
 
@@ -38,7 +38,8 @@ public class SFormsFastMapDirect {
   private SFormsFastMapDirect(boolean initialize) {
     if (initialize) {
       for (int i = 2; i >= 0; i--) {
-        elements[i] = new FastSparseSet[0];
+        @SuppressWarnings("unchecked") FastSparseSet<Integer>[] empty = new FastSparseSet[0];
+        elements[i] = empty;
         next[i] = new int[0];
       }
     }
@@ -50,7 +51,7 @@ public class SFormsFastMapDirect {
       int[] arrnext = map.next[i];
 
       int length = arr.length;
-      FastSparseSet<Integer>[] arrnew = new FastSparseSet[length];
+      @SuppressWarnings("unchecked") FastSparseSet<Integer>[] arrnew = new FastSparseSet[length];
       int[] arrnextnew = new int[length];
 
       System.arraycopy(arr, 0, arrnew, 0, length);
@@ -78,7 +79,7 @@ public class SFormsFastMapDirect {
       if (length > 0) {
         int[] arrnext = next[i];
 
-        FastSparseSet<Integer>[] arrnew = new FastSparseSet[length];
+        @SuppressWarnings("unchecked") FastSparseSet<Integer>[] arrnew = new FastSparseSet[length];
         int[] arrnextnew = new int[length];
 
         System.arraycopy(arrnext, 0, arrnextnew, 0, length);
@@ -174,7 +175,7 @@ public class SFormsFastMapDirect {
     }
   }
 
-  private void changeNext(int[] arrnext, int key, int oldnext, int newnext) {
+  private static void changeNext(int[] arrnext, int key, int oldnext, int newnext) {
     for (int i = key - 1; i >= 0; i--) {
       if (arrnext[i] == oldnext) {
         arrnext[i] = newnext;
@@ -343,7 +344,7 @@ public class SFormsFastMapDirect {
         }
 
         Set<Integer> set = entry.getValue().toPlainSet();
-        buffer.append(entry.getKey() + "={" + set.toString() + "}");
+        buffer.append(entry.getKey()).append("={").append(set.toString()).append("}");
       }
     }
 
@@ -399,7 +400,7 @@ public class SFormsFastMapDirect {
       }
     }
 
-    FastSparseSet<Integer>[] arrnew = new FastSparseSet[minsize];
+    @SuppressWarnings("unchecked") FastSparseSet<Integer>[] arrnew = new FastSparseSet[minsize];
     System.arraycopy(arr, 0, arrnew, 0, arr.length);
 
     int[] arrnextnew = new int[minsize];
diff --git a/src/org/jetbrains/java/decompiler/util/VBStyleCollection.java b/src/org/jetbrains/java/decompiler/util/VBStyleCollection.java
index f4d5968..cdc1762 100644
--- a/src/org/jetbrains/java/decompiler/util/VBStyleCollection.java
+++ b/src/org/jetbrains/java/decompiler/util/VBStyleCollection.java
@@ -115,7 +115,7 @@ public class VBStyleCollection<E, K> extends ArrayList<E> {
 
   public E remove(int index) {
     addToListIndex(index + 1, -1);
-    Object obj = lstKeys.get(index);
+    K obj = lstKeys.get(index);
     if (obj != null) {
       map.remove(obj);
     }