diff --git a/semantic/AttributeKill.valid.java b/semantic/AttributeKill.valid.java
index 993356674c5c3be728b99c7638f3a790b89698da..6e9d3c8e35bfdd65a6578f11f44dea9189c44b2d 100644
--- a/semantic/AttributeKill.valid.java
+++ b/semantic/AttributeKill.valid.java
@@ -2,28 +2,26 @@ class AttributeKill {
 
     public A objectA;
 
-
     public static void main(String[] args) {
 
+        /* create and construct object A*/
         A objectA = new A();
         objectA.init();
 
+        /* set object to null*/
         objectA = null;
-
-       int a = objectA.atr;
+        /* calling uninitiated attribute of null object*/
+        int a = objectA.atr;
 
     }
-
-
 }
 
 class A {
+
     public int atr;
 
     /* pseudo constructor */
-    public void init () {
-
+    public void init() {
         atr = 2;
     }
-
 }
\ No newline at end of file
diff --git a/semantic/NoParameterDeclaration.invalid.mj b/semantic/NoParameterDeclaration.invalid.mj
index d11606d706b9f503ba230a015a9d7fc135b4e407..8ccf44303b2274dd6f3c971593e153cbc22ababb 100644
--- a/semantic/NoParameterDeclaration.invalid.mj
+++ b/semantic/NoParameterDeclaration.invalid.mj
@@ -4,13 +4,16 @@
  */
 class NoParameterDeclaration {
 
+    public int a;
 
     public static void main(String[] args) {
+
+        NoParameterDeclaration testObj = new NoParameterDeclaration();
         /*there is no parameter given here*/
         testObj.test();
     }
 
-    public void test (int i) {
+    public void test(int i) {
         int a = i;
     }
 
diff --git a/semantic/OverwriteAttributeWithUndeclaredVariable.invalid.mj b/semantic/OverwriteAttributeWithUndeclaredVariable.invalid.mj
index 75bcbaf10b71ff5150ce0a6c4fe6a0a6ad512d1d..faa0b2da5d16ca3964d5708d42a7043d61c311b2 100644
--- a/semantic/OverwriteAttributeWithUndeclaredVariable.invalid.mj
+++ b/semantic/OverwriteAttributeWithUndeclaredVariable.invalid.mj
@@ -1,17 +1,22 @@
 class OverwriteAttributeWithUndeclaredVariable {
-    public static void main(String[] args) {}
 
     public String a;
 
-    public void test () {
-        /*should break here because of undeclared unknown variable*/
-        int a = i;
+    public static void main(String[] args) {
+
+        OverwriteAttributeWithUndeclaredVariable obj = new OverwriteAttributeWithUndeclaredVariable();
 
+        obj.test();
 
     }
 
+    public void test() {
+        /*should break here because of undeclared unknown variable*/
+        a = i;
+    }
 }
 
-class String {}
+class String {
+}
 
 
diff --git a/semantic/RightVariable.valid.java b/semantic/RightVariable.valid.java
index 075df9331cae4d6a1e0e967e00956fd9b61bb48b..3a0f089f3293017d9b194d46fad5c41002db591e 100644
--- a/semantic/RightVariable.valid.java
+++ b/semantic/RightVariable.valid.java
@@ -3,7 +3,8 @@
  */
 class RightVariable {
 
-    public static void main(String[] args) {}
+    public static void main(String[] args) {
+    }
 
     public int Test;
 
@@ -27,20 +28,19 @@ class RightVariable {
         /*Overwrite test attribute with RightVariable class Attribute*/
         test.Test = Test;
 
-        /*call local method with test*/
+        /*call class RightVariable method Test, with the test object declared in the current method*/
         Test(test);
 
         /*Overwrite class Test with with local method Test, with itself given as an obj ref..*/
         test = Test(test);
 
     }
-
-
 }
 
 class Test {
 
     public int Test;
 
-    public void Test() {}
+    public void Test() {
+    }
 }
\ No newline at end of file