CarShape and HouseShape Classes

public class CarShape implements SceneShape 
{ 
   ... 
   public void setSelected(boolean b) { selected = b; } 
   public boolean isSelected() { return selected; }
   private boolean selected; 
} 

public class HouseShape implements SceneShape
{ 
   ... 
   public void setSelected(boolean b) { selected = b; } 
   public boolean isSelected() { return selected; }
   private boolean selected; 
}