added class declarations

src/tanks/DrawableObject.java

@@ -0,0 +1,6 @@
+package tanks;
+
+public class DrawableObject 
+{
+    
+}

src/tanks/GameElement.java

@@ -0,0 +1,7 @@
+package tanks;
+
+
+public class GameElement 
+{
+    
+}

src/tanks/RotationalElement.java

@@ -0,0 +1,6 @@
+package tanks;
+
+public class RotationalElement 
+{
+    
+}

src/tanks/Tanks.java

@@ -6,9 +6,26 @@ package tanks;
  */
 public class Tanks 
 {
-    public static void main(String[] arguments) 
+    
+    private class Player extends RotationalElement
+    {
+        
+    }
+    private abstract class Enemy extends RotationalElement
+    {
+        
+    }
+    private class Zombie extends Enemy
+    {
+        
+    }
+    private class Bullet extends RotationalElement
     {
         
     }
     
+    public static void main(String[] arguments) 
+    {
+        
+    }
 }