1 class X 2 { 3     X() 4     { 5         System.out.println("x");            //2 6     }     7     Y y=new Y();                            //1 8 } 9 class Y10 {11 12     Y()13     {14         System.out.println("y");15     }16 }17  class Z extends X{18 19     /**20      * @param args21      */22      Y y=new Y();            //323     Z()24     {25         System.out.println("z");            //426     }27     public static void main(String[] args)28     {29         // TODO Auto-generated method stub30         new Z();31     }32 33 }