diff --git a/src/main/java/ast/parameter/ParameterListNode.java b/src/main/java/ast/parameter/ParameterListNode.java
index 69d12f3..ff1c58d 100644
--- a/src/main/java/ast/parameter/ParameterListNode.java
+++ b/src/main/java/ast/parameter/ParameterListNode.java
@@ -6,7 +6,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class ParameterListNode implements ASTNode {
-    List<ParameterNode> parameters = new ArrayList<>();
+    public List<ParameterNode> parameters = new ArrayList<>();
 
     public ParameterListNode(List<ParameterNode> parameters){
         this.parameters = parameters;
diff --git a/src/main/java/bytecode/ClassCodeGen.java b/src/main/java/bytecode/ClassCodeGen.java
index 7a1c0f0..b0afa69 100644
--- a/src/main/java/bytecode/ClassCodeGen.java
+++ b/src/main/java/bytecode/ClassCodeGen.java
@@ -13,14 +13,19 @@ import org.objectweb.asm.Opcodes;
 import java.io.FileOutputStream;
 import java.io.IOException;
 
+
 public class ClassCodeGen implements ClassVisitor {
-    Mapper mapper = new Mapper();
-    ClassWriter classWriter;
+    private Mapper mapper;
+    private ClassWriter classWriter;
+
+    public ClassCodeGen() {
+        mapper = new Mapper();
+    }
 
     @Override
     public void visit(ClassNode classNode) {
         classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
-        classWriter.visit(Opcodes.V1_8, mapper.mapAccesTypeToOpcode(classNode.accessType), classNode.identifier, null,
+        classWriter.visit(Opcodes.V1_5, mapper.mapAccessTypeToOpcode(classNode.accessType), classNode.identifier, null,
                 "java/lang/Object", null);
 
         for (MemberNode memberNode : classNode.members) {
@@ -41,7 +46,7 @@ public class ClassCodeGen implements ClassVisitor {
     @Override
     public void visit(FieldNode fieldNode) {
         if(fieldNode.type instanceof BaseTypeNode baseTypeNode){
-            classWriter.visitField(mapper.mapAccesTypeToOpcode(fieldNode.accessTypeNode), fieldNode.identifier, mapper.getTypeChar(baseTypeNode.enumType), null, null );
+            classWriter.visitField(mapper.mapAccessTypeToOpcode(fieldNode.accessTypeNode), fieldNode.identifier, mapper.getTypeChar(baseTypeNode.enumType), null, null );
         }
         classWriter.visitEnd();
     }
diff --git a/src/main/java/bytecode/FieldCodeGen.java b/src/main/java/bytecode/FieldCodeGen.java
deleted file mode 100644
index abbda43..0000000
--- a/src/main/java/bytecode/FieldCodeGen.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package bytecode;
-
-import ast.member.FieldNode;
-import org.objectweb.asm.ClassWriter;
-import org.objectweb.asm.FieldVisitor;
-
-public class FieldCodeGen {
-
-    public void generateFieldCode(ClassWriter classWriter, FieldNode fieldNode) {
-        Mapper mapper = new Mapper();
-        FieldVisitor fieldVisitor = classWriter.visitField(mapper.mapAccesTypeToOpcode(fieldNode.accessTypeNode), fieldNode.identifier, "", null, null);
-    }
-}
diff --git a/src/main/java/bytecode/Mapper.java b/src/main/java/bytecode/Mapper.java
index fb4f484..4bc1e7c 100644
--- a/src/main/java/bytecode/Mapper.java
+++ b/src/main/java/bytecode/Mapper.java
@@ -1,10 +1,12 @@
 package bytecode;
 
+import ast.parameter.ParameterListNode;
+import ast.parameter.ParameterNode;
 import ast.type.*;
 import org.objectweb.asm.Opcodes;
 
 public class Mapper {
-    public int mapAccesTypeToOpcode(AccessTypeNode type) {
+    public int mapAccessTypeToOpcode(AccessTypeNode type) {
         switch (type.enumAccessTypeNode) {
             case EnumAccessTypeNode.PUBLIC:
                 return Opcodes.ACC_PUBLIC;
@@ -14,8 +16,12 @@ public class Mapper {
         return 0;
     }
 
-    public String generateMethodDescriptor(BaseTypeNode baseTypeNode) {
-        String descriptor = "()";
+    public String generateMethodDescriptor(BaseTypeNode baseTypeNode, ParameterListNode parameterListNode) {
+        String descriptor = "(";
+        for(ParameterNode parameterNode : parameterListNode.parameters) {
+            descriptor += getTypeChar(EnumTypeNode.INT);
+        }
+        descriptor += ")";
         descriptor += getTypeChar(baseTypeNode.enumType);
         return descriptor;
     }
diff --git a/src/main/java/bytecode/MethodCodeGen.java b/src/main/java/bytecode/MethodCodeGen.java
index c8a38f3..a4249f1 100644
--- a/src/main/java/bytecode/MethodCodeGen.java
+++ b/src/main/java/bytecode/MethodCodeGen.java
@@ -2,40 +2,99 @@ package bytecode;
 
 import ast.member.ConstructorNode;
 import ast.member.MethodNode;
+import ast.parameter.ParameterListNode;
+import ast.parameter.ParameterNode;
 import ast.type.BaseTypeNode;
+import ast.type.EnumTypeNode;
 import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.Label;
 import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Opcodes;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.objectweb.asm.Opcodes.*;
+
 
 public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
 
     private ClassWriter classWriter;
-    Mapper mapper = new Mapper();
+    private Mapper mapper;
     private MethodVisitor methodVisitor;
 
+    private List<String> localVaribales;
+
     public MethodCodeGen(ClassWriter classWriter) {
         this.classWriter = classWriter;
+        mapper = new Mapper();
+        localVaribales = new ArrayList<>();
     }
 
     @Override
     public void visit(ConstructorNode constructorNode) {
-        MethodVisitor constructor =
-                classWriter.visitMethod(mapper.mapAccesTypeToOpcode(constructorNode.visibility),
+        methodVisitor =
+                classWriter.visitMethod(mapper.mapAccessTypeToOpcode(constructorNode.visibility),
                         "<init>",
                         "()V",
                         null,
                         null);
-        constructor.visitEnd();
+        methodVisitor.visitCode();
+        methodVisitor.visitVarInsn(ALOAD, 0);
+        methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
+        methodVisitor.visitInsn(RETURN);
+        methodVisitor.visitMaxs(1, 1);
+        methodVisitor.visitEnd();
     }
 
     @Override
     public void visit(MethodNode methodNode) {
-        if(methodNode.type instanceof BaseTypeNode baseTypeNode){
-            MethodVisitor method = classWriter.visitMethod(mapper.mapAccesTypeToOpcode(methodNode.visibility),
+        if (methodNode.type instanceof BaseTypeNode baseTypeNode) {
+            methodVisitor = classWriter.visitMethod(mapper.mapAccessTypeToOpcode(methodNode.visibility),
                     methodNode.identifier,
-                    mapper.generateMethodDescriptor(baseTypeNode),
+                    mapper.generateMethodDescriptor(baseTypeNode, methodNode.parameters),
                     null,
                     null);
-            method.visitEnd();
+
+            methodVisitor.visitCode();
+            localVaribales.add("this");
+            for (ParameterNode parameterNode : methodNode.parameters.parameters) {
+                localVaribales.add(parameterNode.identifier);
+            }
+
+            //test();
+            methodVisitor.visitMaxs(1, localVaribales.size());
+            methodVisitor.visitEnd();
         }
     }
+
+    public void test() {
+        Label start = new Label();
+        Label loop = new Label();
+        Label end = new Label();
+        methodVisitor.visitLabel(start);
+        //methodVisitor.visitVarInsn(Opcodes.ICONST_M1, 99);
+        //methodVisitor.visitInsn(Opcodes.ICONST_5);
+        methodVisitor.visitLdcInsn(99);
+        // methodVisitor.visitInsn(Opcodes.ICONST_0);
+        //methodVisitor.visitVarInsn(Opcodes.ILOAD, 2);
+        methodVisitor.visitVarInsn(Opcodes.ISTORE, 1);
+        methodVisitor.visitLabel(loop);
+        methodVisitor.visitVarInsn(Opcodes.ILOAD, 1);
+        methodVisitor.visitInsn(Opcodes.ICONST_5);
+        methodVisitor.visitJumpInsn(Opcodes.IF_ICMPGE, end);
+        methodVisitor.visitFieldInsn(Opcodes.GETSTATIC,
+                "java/lang/System", "out",
+                "Ljava/io/PrintStream;");
+        methodVisitor.visitLdcInsn("Bytecode");
+        methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
+                "java/io/PrintStream", "println",
+                "(Ljava/lang/String;)V", false);
+        methodVisitor.visitIincInsn(1, 1);
+        methodVisitor.visitJumpInsn(Opcodes.GOTO, loop);
+        methodVisitor.visitLabel(end);
+        methodVisitor.visitVarInsn(Opcodes.ILOAD, 1);
+        methodVisitor.visitInsn(Opcodes.IRETURN);
+        methodVisitor.visitEnd();
+    }
 }