diff --git a/src/main/java/ast/statementexpressions/crementexpressions/DecrementNode.java b/src/main/java/ast/statementexpressions/crementexpressions/DecrementNode.java
index 8308e07..175c6f4 100644
--- a/src/main/java/ast/statementexpressions/crementexpressions/DecrementNode.java
+++ b/src/main/java/ast/statementexpressions/crementexpressions/DecrementNode.java
@@ -7,7 +7,7 @@ import semantic.SemanticVisitor;
 import typechecker.TypeCheckResult;
 import visitor.Visitable;
 
-public class DecrementNode implements IStatementExpressionNode {
+public class DecrementNode implements IStatementExpressionNode, Visitable {
     public CrementType crementType;
     public AssignableNode assignableExpression;
 
@@ -20,4 +20,9 @@ public class DecrementNode implements IStatementExpressionNode {
     public TypeCheckResult accept(SemanticVisitor visitor) {
         return visitor.analyze(this);
     }
+
+    @Override
+    public void accept(MethodVisitor methodVisitor) {
+        methodVisitor.visit(this);
+    }
 }
diff --git a/src/main/java/ast/statementexpressions/crementexpressions/IncrementNode.java b/src/main/java/ast/statementexpressions/crementexpressions/IncrementNode.java
index d736d3f..7e9240d 100644
--- a/src/main/java/ast/statementexpressions/crementexpressions/IncrementNode.java
+++ b/src/main/java/ast/statementexpressions/crementexpressions/IncrementNode.java
@@ -5,8 +5,9 @@ import ast.statementexpressions.IStatementExpressionNode;
 import bytecode.visitor.MethodVisitor;
 import semantic.SemanticVisitor;
 import typechecker.TypeCheckResult;
+import visitor.Visitable;
 
-public class IncrementNode implements IStatementExpressionNode {
+public class IncrementNode implements IStatementExpressionNode, Visitable {
     public CrementType crementType;
     public AssignableNode assignableExpression;
 
@@ -19,4 +20,9 @@ public class IncrementNode implements IStatementExpressionNode {
     public TypeCheckResult accept(SemanticVisitor visitor) {
         return visitor.analyze(this);
     }
+
+    @Override
+    public void accept(MethodVisitor methodVisitor) {
+        methodVisitor.visit(this);
+    }
 }
diff --git a/src/main/java/ast/statementexpressions/methodcallstatementnexpressions/ChainedMethodNode.java b/src/main/java/ast/statementexpressions/methodcallstatementnexpressions/ChainedMethodNode.java
index ae01b85..1d2f0ab 100644
--- a/src/main/java/ast/statementexpressions/methodcallstatementnexpressions/ChainedMethodNode.java
+++ b/src/main/java/ast/statementexpressions/methodcallstatementnexpressions/ChainedMethodNode.java
@@ -22,11 +22,6 @@ public class ChainedMethodNode implements ASTNode, Visitable {
         expressions.add(expression);
     }
 
-    @Override
-    public void accept(MethodVisitor methodVisitor) {
-        methodVisitor.visit(this);
-    }
-
     @Override
     public TypeCheckResult accept(SemanticVisitor visitor) {
         return null;
diff --git a/src/main/java/bytecode/ClassCodeGen.java b/src/main/java/bytecode/ClassCodeGen.java
index e7475f1..2173158 100644
--- a/src/main/java/bytecode/ClassCodeGen.java
+++ b/src/main/java/bytecode/ClassCodeGen.java
@@ -27,7 +27,7 @@ public class ClassCodeGen implements ClassVisitor {
     private boolean generateClassFiles;
 
     public ClassCodeGen(JarOutputStream jarOutputStream, String outputDirectory, boolean generateJar, boolean generateClassFiles) {
-        mapper = new Mapper();
+        this.mapper = new Mapper();
         this.jarOutputStream = jarOutputStream;
         this.outputDirectory = outputDirectory;
         this.generateJar = generateJar;
diff --git a/src/main/java/bytecode/Mapper.java b/src/main/java/bytecode/Mapper.java
index 0c842ba..0ddd1af 100644
--- a/src/main/java/bytecode/Mapper.java
+++ b/src/main/java/bytecode/Mapper.java
@@ -3,6 +3,7 @@ package bytecode;
 import ast.parameters.ParameterNode;
 import ast.type.*;
 import ast.type.type.BaseType;
+import ast.type.type.ITypeNode;
 import ast.type.type.ReferenceType;
 import ast.type.type.TypeEnum;
 import org.objectweb.asm.Opcodes;
@@ -24,7 +25,7 @@ public class Mapper {
         return 0;
     }
 
-    public String generateMethodDescriptor(BaseType type, List<ParameterNode> parameters) {
+    public String generateMethodDescriptor(ITypeNode type, List<ParameterNode> parameters) {
         String descriptor = "(";
         for (ParameterNode parameterNode : parameters) {
             if(parameterNode.type instanceof BaseType) {
@@ -35,7 +36,11 @@ public class Mapper {
             }
         }
         descriptor += ")";
-        descriptor += getTypeChar(type);
+        if(type instanceof BaseType) {
+            descriptor += getTypeChar((BaseType) type);
+        } else if(type instanceof ReferenceType) {
+            descriptor += "L" + ((ReferenceType) type).getIdentifier() +";";
+        }
         return descriptor;
     }
 
diff --git a/src/main/java/bytecode/MethodCodeGen.java b/src/main/java/bytecode/MethodCodeGen.java
index 2744732..83e53f4 100644
--- a/src/main/java/bytecode/MethodCodeGen.java
+++ b/src/main/java/bytecode/MethodCodeGen.java
@@ -14,9 +14,7 @@ import ast.statementexpressions.NewDeclarationNode;
 import ast.statementexpressions.crementexpressions.CrementType;
 import ast.statementexpressions.crementexpressions.DecrementNode;
 import ast.statementexpressions.crementexpressions.IncrementNode;
-import ast.statementexpressions.methodcallstatementnexpressions.ChainedMethodNode;
 import ast.statementexpressions.methodcallstatementnexpressions.MethodCallNode;
-import ast.statementexpressions.methodcallstatementnexpressions.TargetNode;
 import ast.statements.*;
 import ast.type.ValueNode;
 import ast.type.type.BaseType;
@@ -71,9 +69,7 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
 
         // Visit all statements
         for (IStatementNode statementNode : constructorNode.block.statements) {
-            if (statementNode != null) {
-                statementNode.accept(this);
-            }
+            statementNode.accept(this);
         }
 
         methodVisitor.visitMaxs(0, 0);
@@ -105,7 +101,7 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
     public void visit(MethodNode methodNode) {
         methodVisitor = classWriter.visitMethod(mapper.mapAccessTypeToOpcode(methodNode.accesModifier),
                 methodNode.getIdentifier(),
-                mapper.generateMethodDescriptor((BaseType) methodNode.getType(), methodNode.parameters),
+                mapper.generateMethodDescriptor(methodNode.getType(), methodNode.parameters),
                 null,
                 null);
 
@@ -241,7 +237,7 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
                 nonCalculationNode.unaryExpression.accept(this);
                 nonCalculationNode.expression.accept(this);
                 if (nonCalculationNode.unaryExpression.getType() instanceof BaseType && nonCalculationNode.expression.getType() instanceof BaseType) {
-                    methodVisitor.visitJumpInsn(IF_ACMPEQ, labelFalse);
+                    methodVisitor.visitJumpInsn(IF_ICMPEQ, labelFalse);
                 } else {
                     methodVisitor.visitJumpInsn(IF_ACMPEQ, labelFalse);
                 }
@@ -266,9 +262,17 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
     @Override
     public void visit(MemberAccessNode memberAccessNode) {
         // Only used to get, not to put
-        if (memberAccessNode.thisExpr) { // Field
-            // methodVisitor.visitFieldInsn(GETFIELD, memberAccessNode.identifiers.get(0), memberAccessNode.identifiers.get(1), );
-        } else { // Object Attribut
+        int localVarIndex = localVariables.indexOf("memberAccessNode.identifier"); // TODO
+        if (localVarIndex >= 0) { // local var object
+            methodVisitor.visitVarInsn(ALOAD, localVarIndex);
+        } else { // this field
+            methodVisitor.visitVarInsn(ALOAD, 0);
+        }
+
+        if (memberAccessNode.getTypeNode() instanceof BaseType) {
+            methodVisitor.visitFieldInsn(GETFIELD, memberAccessNode.identifiers.get(0), memberAccessNode.identifiers.get(1), mapper.getTypeChar((BaseType) memberAccessNode.getTypeNode()));
+        } else if (memberAccessNode.getTypeNode() instanceof ReferenceType) {
+            methodVisitor.visitFieldInsn(GETFIELD, memberAccessNode.identifiers.get(0), memberAccessNode.identifiers.get(1), "L" + ((ReferenceType) memberAccessNode.getTypeNode()).getIdentifier() + ";");
         }
     }
 
@@ -331,6 +335,7 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
             // else if statements
             methodVisitor.visitJumpInsn(IFEQ, elseIfLabels[0]);
         }
+
         ifElseNode.ifStatement.block.accept(this); // accept if block
 
         Label endLabel = new Label();
@@ -362,22 +367,17 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
         if (localVariableDeclarationNode.expression != null) {
             // Process expression
             localVariableDeclarationNode.expression.accept(this);
-            // Store result of expression in variable
-            if (localVariables.contains(localVariableDeclarationNode.identifier)) {
-                if (localVariableDeclarationNode.type instanceof BaseType) {
-                    methodVisitor.visitVarInsn(ISTORE, localVariables.indexOf(localVariableDeclarationNode.identifier));
-                } else if (localVariableDeclarationNode.type instanceof ReferenceType) {
-                    methodVisitor.visitVarInsn(ASTORE, localVariables.indexOf(localVariableDeclarationNode.identifier));
-                }
-            } else {
+            // add local var to list if not in list
+            if (!localVariables.contains(localVariableDeclarationNode.identifier)) {
                 localVariables.add(localVariableDeclarationNode.identifier);
-                if (localVariableDeclarationNode.type instanceof BaseType) {
-                    methodVisitor.visitVarInsn(ISTORE, localVariables.indexOf(localVariableDeclarationNode.identifier));
-                } else if (localVariableDeclarationNode.type instanceof ReferenceType) {
-                    methodVisitor.visitVarInsn(ASTORE, localVariables.indexOf(localVariableDeclarationNode.identifier));
-                }
+            }
+            if (localVariableDeclarationNode.type instanceof BaseType) {
+                methodVisitor.visitVarInsn(ISTORE, localVariables.indexOf(localVariableDeclarationNode.identifier));
+            } else if (localVariableDeclarationNode.type instanceof ReferenceType) {
+                methodVisitor.visitVarInsn(ASTORE, localVariables.indexOf(localVariableDeclarationNode.identifier));
             }
         } else {
+            // Local var declaration
             if (!localVariables.contains(localVariableDeclarationNode.identifier)) {
                 localVariables.add(localVariableDeclarationNode.identifier);
             }
@@ -386,40 +386,106 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
 
     @Override
     public void visit(AssignNode assignNode) {
-        // Process expression
+        if (assignNode.assignable.memberAccess != null) { // this / object
+            if (assignNode.expression instanceof IncrementNode) {
+                if (((IncrementNode) assignNode.expression).crementType.equals(CrementType.PREFIX)) { // ++i
+                    fieldOrObjectVarPrefixCrementAssign(assignNode);
+                } else { // i++
+                    fieldOrObjectVarSuffixCrementAssign(assignNode);
+                }
+            } else if (assignNode.expression instanceof DecrementNode) {
+                if (((DecrementNode) assignNode.expression).crementType.equals(CrementType.PREFIX)) {
+                    fieldOrObjectVarPrefixCrementAssign(assignNode);
+                } else {
+                    fieldOrObjectVarSuffixCrementAssign(assignNode);
+                }
+            } else {
+                assignFieldOrObjectVar(assignNode);
+            }
+        } else { // local var
+            if (assignNode.expression instanceof IncrementNode || assignNode.expression instanceof DecrementNode) {
+                localVarCrementAssign(assignNode);
+            } else {
+                assignNode.expression.accept(this);
+                assignLocalVar(assignNode);
+            }
+        }
+    }
+
+    private void localVarCrementAssign(AssignNode assignNode) {
         if (assignNode.expression instanceof IncrementNode) {
             IncrementNode incrementNode = (IncrementNode) assignNode.expression;
             if (incrementNode.crementType.equals(CrementType.PREFIX)) { // ++i
-                methodVisitor.visitIincInsn(localVariables.indexOf(incrementNode.assignableExpression.identifier), 1);
-                assign(assignNode);
-            } else if (incrementNode.crementType.equals(CrementType.SUFFIX)) { // Suffix: i++
-                assign(assignNode);
-                methodVisitor.visitIincInsn(localVariables.indexOf(incrementNode.assignableExpression.identifier), 1);
+                incrementNode.accept(this);
+                assignLocalVar(assignNode);
+            } else { // i++
+                loadBeforeCrement(assignNode);
+                assignLocalVar(assignNode);
+                incrementNode.accept(this);
             }
         } else if (assignNode.expression instanceof DecrementNode) {
             DecrementNode decrementNode = (DecrementNode) assignNode.expression;
             if (decrementNode.crementType.equals(CrementType.PREFIX)) {
-                methodVisitor.visitIincInsn(localVariables.indexOf(decrementNode.assignableExpression.identifier), -1);
-                assign(assignNode);
-            } else if (decrementNode.crementType.equals(CrementType.SUFFIX)) {
-                assign(assignNode);
-                methodVisitor.visitIincInsn(localVariables.indexOf(decrementNode.assignableExpression.identifier), 1);
+                decrementNode.accept(this);
+                assignLocalVar(assignNode);
+            } else {
+                loadBeforeCrement(assignNode);
+                assignLocalVar(assignNode);
+                decrementNode.accept(this);
             }
-        } else {
-            assignNode.expression.accept(this);
-            assign(assignNode);
         }
     }
 
-    private void assign(AssignNode assignNode) {
-        if (assignNode.assignable.memberAccess.thisExpr) {
-            assignField(assignNode);
+    private void fieldOrObjectVarPrefixCrementAssign(AssignNode assignNode) {
+        int localVarIndex = localVariables.indexOf(assignNode.assignable.identifier);
+        if(localVarIndex >= 0) { // object
+            methodVisitor.visitVarInsn(ALOAD, localVarIndex);
+        } else if(assignNode.assignable.memberAccess.thisExpr) { // field
+            methodVisitor.visitVarInsn(ALOAD, 0);
         } else {
-            assignLocalVar(assignNode);
+            localVariables.add(assignNode.assignable.identifier);
+            methodVisitor.visitVarInsn(ALOAD, localVariables.indexOf(assignNode.assignable.identifier));
         }
+
+        assignNode.expression.accept(this);
+        methodVisitor.visitInsn(DUP_X1);
+
+        if (assignNode.expression instanceof BaseType) {
+            methodVisitor.visitFieldInsn(PUTFIELD, assignNode.assignable.memberAccess.identifiers.get(0), assignNode.assignable.memberAccess.identifiers.get(1), mapper.getTypeChar((BaseType) assignNode.expression.getType()));
+        } else if (assignNode.expression instanceof ReferenceType) {
+            ReferenceType referenceType = (ReferenceType) assignNode.expression.getType();
+            methodVisitor.visitFieldInsn(PUTFIELD, assignNode.assignable.memberAccess.identifiers.get(0), assignNode.assignable.memberAccess.identifiers.get(1), "L" + referenceType.getIdentifier() + ";");
+        }
+    }
+
+    private void fieldOrObjectVarSuffixCrementAssign(AssignNode assignNode) {
+        int localVarIndex = localVariables.indexOf(assignNode.assignable.identifier);
+        if(localVarIndex >= 0) { // object
+            methodVisitor.visitVarInsn(ALOAD, localVarIndex);
+        } else if(assignNode.assignable.memberAccess.thisExpr) { // field
+            methodVisitor.visitVarInsn(ALOAD, 0);
+        } else {
+            localVariables.add(assignNode.assignable.identifier);
+            methodVisitor.visitVarInsn(ALOAD, localVariables.indexOf(assignNode.assignable.identifier));
+        }
+
+        loadBeforeCrement(assignNode);
+        
+        if (assignNode.expression instanceof BaseType) {
+            methodVisitor.visitFieldInsn(PUTFIELD, assignNode.assignable.memberAccess.identifiers.get(0), assignNode.assignable.memberAccess.identifiers.get(1), mapper.getTypeChar((BaseType) assignNode.expression.getType()));
+        } else if (assignNode.expression instanceof ReferenceType) {
+            ReferenceType referenceType = (ReferenceType) assignNode.expression.getType();
+            methodVisitor.visitFieldInsn(PUTFIELD, assignNode.assignable.memberAccess.identifiers.get(0), assignNode.assignable.memberAccess.identifiers.get(1), "L" + referenceType.getIdentifier() + ";");
+        }
+
+        assignNode.expression.accept(this);
     }
 
     private void assignLocalVar(AssignNode assignNode) {
+        methodVisitor.visitInsn(DUP);
+        if (!localVariables.contains(assignNode.assignable.identifier)) {
+            localVariables.add(assignNode.assignable.identifier);
+        }
         if (assignNode.expression instanceof BaseType) {
             methodVisitor.visitVarInsn(ISTORE, localVariables.indexOf(assignNode.assignable.identifier));
         } else if (assignNode.expression instanceof ReferenceType) {
@@ -427,12 +493,105 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
         }
     }
 
-    private void assignField(AssignNode assignNode) {
+    private void assignFieldOrObjectVar(AssignNode assignNode) {
+        int localVarIndex = localVariables.indexOf(assignNode.assignable.identifier);
+        if (localVarIndex >= 0) { // object
+            methodVisitor.visitVarInsn(ALOAD, localVarIndex);
+        } else if (assignNode.assignable.memberAccess.thisExpr) { // this
+            methodVisitor.visitVarInsn(ALOAD, 0);
+        } else {
+            localVariables.add(assignNode.assignable.identifier);
+            methodVisitor.visitVarInsn(ALOAD, localVariables.indexOf(assignNode.assignable.identifier));
+        }
+
+        assignNode.expression.accept(this);
+        methodVisitor.visitInsn(DUP_X1);
+
         if (assignNode.expression instanceof BaseType) {
             methodVisitor.visitFieldInsn(PUTFIELD, assignNode.assignable.memberAccess.identifiers.get(0), assignNode.assignable.memberAccess.identifiers.get(1), mapper.getTypeChar((BaseType) assignNode.expression.getType()));
         } else if (assignNode.expression instanceof ReferenceType) {
             ReferenceType referenceType = (ReferenceType) assignNode.expression.getType();
-            methodVisitor.visitFieldInsn(PUTFIELD, assignNode.assignable.memberAccess.identifiers.get(0), assignNode.assignable.memberAccess.identifiers.get(1), "L"+referenceType.getIdentifier()+";");
+            methodVisitor.visitFieldInsn(PUTFIELD, assignNode.assignable.memberAccess.identifiers.get(0), assignNode.assignable.memberAccess.identifiers.get(1), "L" + referenceType.getIdentifier() + ";");
+        }
+    }
+
+    private void loadBeforeCrement(AssignNode assignNode) {
+        if(assignNode.expression instanceof IncrementNode) {
+            IncrementNode incrementNode = (IncrementNode) assignNode.expression;
+            if(incrementNode.assignableExpression.memberAccess != null) {
+                incrementNode.assignableExpression.memberAccess.accept(this);
+            } else {
+                if(assignNode.assignable.getTypeNode() instanceof BaseType) {
+                    methodVisitor.visitVarInsn(ILOAD, localVariables.indexOf(assignNode.assignable.identifier));
+                } else if(assignNode.assignable.getTypeNode() instanceof ReferenceType) {
+                    methodVisitor.visitVarInsn(ALOAD, localVariables.indexOf(assignNode.assignable.identifier));
+                }
+            }
+        } else if(assignNode.expression instanceof DecrementNode) {
+            DecrementNode decrementNode = (DecrementNode) assignNode.expression;
+            if(decrementNode.assignableExpression.memberAccess != null) {
+                decrementNode.assignableExpression.memberAccess.accept(this);
+            } else {
+                if(assignNode.assignable.getTypeNode() instanceof BaseType) {
+                    methodVisitor.visitVarInsn(ILOAD, localVariables.indexOf(assignNode.assignable.identifier));
+                } else if(assignNode.assignable.getTypeNode() instanceof ReferenceType) {
+                    methodVisitor.visitVarInsn(ALOAD, localVariables.indexOf(assignNode.assignable.identifier));
+                }
+            }
+        }
+    }
+
+    @Override
+    public void visit(IncrementNode incrementNode) {
+        if (incrementNode.assignableExpression.memberAccess != null) { // Object var / field
+            int localVarIndex = localVariables.indexOf(incrementNode.assignableExpression.identifier);
+            if (localVarIndex >= 0) { // object
+                methodVisitor.visitVarInsn(ALOAD, localVarIndex);
+            } else { // this
+                methodVisitor.visitVarInsn(ALOAD, 0);
+            }
+            if (incrementNode.assignableExpression.memberAccess.getTypeNode() instanceof BaseType) {
+                methodVisitor.visitFieldInsn(GETFIELD, incrementNode.assignableExpression.memberAccess.identifiers.get(0), incrementNode.assignableExpression.memberAccess.identifiers.get(1), mapper.getTypeChar((BaseType) incrementNode.assignableExpression.memberAccess.getTypeNode()));
+            } else if (incrementNode.assignableExpression.memberAccess.getTypeNode() instanceof ReferenceType) {
+                methodVisitor.visitFieldInsn(GETFIELD, incrementNode.assignableExpression.memberAccess.identifiers.get(0), incrementNode.assignableExpression.memberAccess.identifiers.get(1), "L" + (((ReferenceType) incrementNode.assignableExpression.memberAccess.getTypeNode()).getIdentifier() + ";"));
+            }
+            methodVisitor.visitInsn(DUP);
+            methodVisitor.visitInsn(ICONST_1);
+            methodVisitor.visitInsn(IADD);
+            if (incrementNode.assignableExpression.memberAccess.getTypeNode() instanceof BaseType) {
+                methodVisitor.visitFieldInsn(PUTFIELD, incrementNode.assignableExpression.memberAccess.identifiers.get(0), incrementNode.assignableExpression.memberAccess.identifiers.get(1), mapper.getTypeChar((BaseType) incrementNode.assignableExpression.memberAccess.getTypeNode()));
+            } else if (incrementNode.assignableExpression.memberAccess.getTypeNode() instanceof ReferenceType) {
+                methodVisitor.visitFieldInsn(PUTFIELD, incrementNode.assignableExpression.memberAccess.identifiers.get(0), incrementNode.assignableExpression.memberAccess.identifiers.get(1), "L" + (((ReferenceType) incrementNode.assignableExpression.memberAccess.getTypeNode()).getIdentifier() + ";"));
+            }
+        } else { // local var
+            methodVisitor.visitIincInsn(localVariables.indexOf(incrementNode.assignableExpression.identifier), 1);
+        }
+    }
+
+    @Override
+    public void visit(DecrementNode decrementNode) {
+        if (decrementNode.assignableExpression.memberAccess != null) { // Object var / field
+            int localVarIndex = localVariables.indexOf(decrementNode.assignableExpression.identifier);
+            if (localVarIndex >= 0) { // object
+                methodVisitor.visitVarInsn(ALOAD, localVarIndex);
+            } else { // this
+                methodVisitor.visitVarInsn(ALOAD, 0);
+            }
+            methodVisitor.visitInsn(DUP);
+            if (decrementNode.assignableExpression.memberAccess.getTypeNode() instanceof BaseType) {
+                methodVisitor.visitFieldInsn(GETFIELD, decrementNode.assignableExpression.memberAccess.identifiers.get(0), decrementNode.assignableExpression.memberAccess.identifiers.get(1), mapper.getTypeChar((BaseType) decrementNode.assignableExpression.memberAccess.getTypeNode()));
+            } else if (decrementNode.assignableExpression.memberAccess.getTypeNode() instanceof ReferenceType) {
+                methodVisitor.visitFieldInsn(GETFIELD, decrementNode.assignableExpression.memberAccess.identifiers.get(0), decrementNode.assignableExpression.memberAccess.identifiers.get(1), "L" + (((ReferenceType) decrementNode.assignableExpression.memberAccess.getTypeNode()).getIdentifier() + ";"));
+            }
+            methodVisitor.visitInsn(ICONST_1);
+            methodVisitor.visitInsn(ISUB);
+            if (decrementNode.assignableExpression.memberAccess.getTypeNode() instanceof BaseType) {
+                methodVisitor.visitFieldInsn(PUTFIELD, decrementNode.assignableExpression.memberAccess.identifiers.get(0), decrementNode.assignableExpression.memberAccess.identifiers.get(1), mapper.getTypeChar((BaseType) decrementNode.assignableExpression.memberAccess.getTypeNode()));
+            } else if (decrementNode.assignableExpression.memberAccess.getTypeNode() instanceof ReferenceType) {
+                methodVisitor.visitFieldInsn(PUTFIELD, decrementNode.assignableExpression.memberAccess.identifiers.get(0), decrementNode.assignableExpression.memberAccess.identifiers.get(1), "L" + (((ReferenceType) decrementNode.assignableExpression.memberAccess.getTypeNode()).getIdentifier() + ";"));
+            }
+        } else { // local var
+            methodVisitor.visitIincInsn(localVariables.indexOf(decrementNode.assignableExpression.identifier), -1);
         }
     }
 
@@ -445,8 +604,7 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
             expressionNode.accept(this);
             parameterNodes.add(new ParameterNode(expressionNode.getType(), ""));
         }
-        methodVisitor.visitMethodInsn(INVOKESPECIAL, newDeclarationNode.identifier, "<init>", mapper.generateMethodDescriptor(new BaseType(TypeEnum.VOID),parameterNodes), false);
-        localVariables.add(newDeclarationNode.identifier);
+        methodVisitor.visitMethodInsn(INVOKESPECIAL, newDeclarationNode.identifier, "<init>", mapper.generateMethodDescriptor(new BaseType(TypeEnum.VOID), parameterNodes), false);
     }
 
     @Override
@@ -518,19 +676,13 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
         methodVisitor.visitLabel(endOfLoopLabel);
     }
 
-    @Override
-    public void visit(ChainedMethodNode chainedMethodNode) {
-        // TODO: Erstmal abwarten
-    }
-
     @Override
     public void visit(MethodCallNode methodCallNode) {
         List<ParameterNode> parameterNodes = new ArrayList<>();
-        for(IExpressionNode expressionNode : methodCallNode.parameters) {
+        for (IExpressionNode expressionNode : methodCallNode.parameters) {
             expressionNode.accept(this);
             parameterNodes.add(new ParameterNode(expressionNode.getType(), ""));
         }
-        // TODO: Klassenname und Returntype
-        //methodVisitor.visitMethodInsn(INVOKEVIRTUAL, classname, methodCallNode.identifier, mapper.generateMethodDescriptor(returntype, parameterNodes), false);
+        methodVisitor.visitMethodInsn(INVOKEVIRTUAL, methodCallNode.target.memberAccess.identifiers.get(0), methodCallNode.identifier, mapper.generateMethodDescriptor(methodCallNode.type, parameterNodes), false);
     }
 }
diff --git a/src/main/java/bytecode/visitor/ClassVisitor.java b/src/main/java/bytecode/visitor/ClassVisitor.java
index af6af4b..3b39422 100644
--- a/src/main/java/bytecode/visitor/ClassVisitor.java
+++ b/src/main/java/bytecode/visitor/ClassVisitor.java
@@ -5,6 +5,5 @@ import ast.members.FieldNode;
 
 public interface ClassVisitor {
     void visit(ClassNode classNode);
-
     void visit(FieldNode fieldNode);
 }
diff --git a/src/main/java/bytecode/visitor/MethodVisitor.java b/src/main/java/bytecode/visitor/MethodVisitor.java
index 89fbb64..f63400c 100644
--- a/src/main/java/bytecode/visitor/MethodVisitor.java
+++ b/src/main/java/bytecode/visitor/MethodVisitor.java
@@ -39,12 +39,14 @@ public interface MethodVisitor {
     // statements
     void visit(IfElseNode ifElseNode);
 
+    void visit(IncrementNode incrementNode);
+    void visit(DecrementNode decrementNode);
+
     void visit(LocalVariableDeclarationNode localVariableDeclarationNode);
     void visit(ReturnNode returnNode);
     void visit(WhileNode whileNode);
 
     // statement expression
-    void visit(ChainedMethodNode chainedMethodNode);
     void visit(MethodCallNode methodCallNode);
 
     void visit(AssignNode assignNode);