diff --git a/src/main/java/ast/statements/WhileNode.java b/src/main/java/ast/statements/WhileNode.java
index 01c1160..b4a4a86 100644
--- a/src/main/java/ast/statements/WhileNode.java
+++ b/src/main/java/ast/statements/WhileNode.java
@@ -1,6 +1,5 @@
 package ast.statements;
 
-import ast.ASTNode;
 import ast.expressions.IExpressionNode;
 import semantic.SemanticVisitor;
 import typechecker.TypeCheckResult;
@@ -14,11 +13,6 @@ public class WhileNode implements IStatementNode {
         this.block = block;
     }
 
-    public void test() {
-        return;
-
-    }
-
     @Override
     public TypeCheckResult accept(SemanticVisitor visitor) {
         return null;
diff --git a/src/main/java/parser/astBuilder/ASTBuilder.java b/src/main/java/parser/astBuilder/ASTBuilder.java
index 7ee199b..c23a010 100644
--- a/src/main/java/parser/astBuilder/ASTBuilder.java
+++ b/src/main/java/parser/astBuilder/ASTBuilder.java
@@ -14,6 +14,7 @@ import ast.members.*;
 import ast.parameters.ParameterNode;
 import ast.statementexpressions.AssignNode;
 import ast.statementexpressions.AssignableNode;
+import ast.statementexpressions.IStatementExpressionNode;
 import ast.statementexpressions.NewDeclarationNode;
 import ast.statementexpressions.crementexpressions.CrementType;
 import ast.statementexpressions.crementexpressions.DecrementNode;
@@ -75,7 +76,12 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
 
     @Override
     public ASTNode visitConstructorDeclaration(SimpleJavaParser.ConstructorDeclarationContext ctx) {
-        ConstructorNode constructorNode = new ConstructorNode(ctx.AccessModifier().getText(), ctx.Identifier().getText(), (BlockNode) visit(ctx.blockStatement()));
+        ConstructorNode constructorNode;
+        if(ctx.AccessModifier() != null) {
+            constructorNode = new ConstructorNode(ctx.AccessModifier().getText(), ctx.Identifier().getText(), (BlockNode) visit(ctx.blockStatement()));
+        } else {
+            constructorNode = new ConstructorNode("public", ctx.Identifier().getText(), (BlockNode) visit(ctx.blockStatement()));
+        }
         if(ctx.parameterList() != null) {
             for(SimpleJavaParser.ParameterContext parameter : ctx.parameterList().parameter()) {
                 constructorNode.addParameter((ParameterNode) visit(parameter));
@@ -177,7 +183,12 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
 
     @Override
     public ASTNode visitLocalVariableDeclaration(SimpleJavaParser.LocalVariableDeclarationContext ctx) {
-        return new LocalVariableDeclarationNode(createTypeNode(ctx.type().getText()), ctx.Identifier().getText(), ctx.Assign().getText(), (IExpressionNode) visit(ctx.expression()));
+        if(ctx.Assign() != null) {
+            return new LocalVariableDeclarationNode(createTypeNode(ctx.type().getText()), ctx.Identifier().getText(), ctx.Assign().getText(), (IExpressionNode) visit(ctx.expression()));
+        } else {
+            return new LocalVariableDeclarationNode(createTypeNode(ctx.type().getText()), ctx.Identifier().getText(), null, null);
+        }
+
     }
 
     @Override
@@ -209,46 +220,60 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
 
     @Override
     public ASTNode visitForStatement(SimpleJavaParser.ForStatementContext ctx) {
-
         List<IStatementNode> statements = new ArrayList<>();
 
-        //init
+        // Initialisierung
         int i = 0;
-        if(ctx.localVariableDeclaration() != null) {
+        if (ctx.localVariableDeclaration() != null) {
             statements.add((IStatementNode) visit(ctx.localVariableDeclaration()));
-        } else if(ctx.statementExpression(i) != null){
+        } else if (ctx.statementExpression(i) != null) {
             statements.add((IStatementNode) visit(ctx.statementExpression(i)));
             i++;
         }
 
-        //condition
+        // Bedingung
         IExpressionNode condition = (IExpressionNode) visit(ctx.expression());
 
-        //ink
-        IStatementNode crement = null;
-        if(ctx.statementExpression(i) != null){
-            crement = (IStatementNode) visit(ctx.statementExpression(i));
+        // Inkrement
+        IStatementExpressionNode crement = null;
+        boolean isPrefix = false;
+        if (ctx.statementExpression(i) != null) {
+            crement = (IStatementExpressionNode) visit(ctx.statementExpression(i));
+
+            if (crement instanceof IncrementNode) {
+                isPrefix = ((IncrementNode) crement).crementType == CrementType.PREFIX;
+            } else if (crement instanceof DecrementNode) {
+                isPrefix = ((DecrementNode) crement).crementType == CrementType.PREFIX;
+            }
         }
 
-        BlockNode forBlock = new BlockNode();
+        BlockNode forBlock = (BlockNode) visit(ctx.blockStatement());
 
-        BlockNode forStatements = (BlockNode) visit(ctx.blockStatement());
-        if(forStatements != null) {
-            forBlock.addStatement((IStatementNode) forStatements);
+        // While-Schleife
+        BlockNode whileBody = new BlockNode();
+
+        // Prä-Inkrement: Das Inkrement kommt vor dem Block
+        if (crement != null && isPrefix) {
+            whileBody.addStatement((IStatementNode) crement);
         }
 
-        if(crement != null){
-            BlockNode forCrement = new BlockNode();
-            forCrement.addStatement((crement));
-            forBlock.addStatement(forCrement);
+        // Block Statements der For-Schleife in den While-Block kopieren
+        for (IStatementNode statement : forBlock.statements) {
+            whileBody.addStatement(statement);
         }
 
-        WhileNode While = new WhileNode(condition, forBlock);
+        // Post-Inkrement: Das Inkrement kommt nach dem Block
+        if (crement != null && !isPrefix) {
+            whileBody.addStatement((IStatementNode) crement);
+        }
 
-        statements.add(While);
+        // Bedingung der While-Schleife
+        WhileNode whileNode = new WhileNode(condition, whileBody);
+
+        statements.add(whileNode);
 
         BlockNode resultBlock = new BlockNode();
-        for(IStatementNode statement : statements) {
+        for (IStatementNode statement : statements) {
             resultBlock.addStatement((IStatementNode) statement);
         }