内部类可以被继承

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/**内部类能不能重载:结果证明：内部类不能重装*/class Egg {      // private Yolk y;       protected class Yolk  {               public Yolk(){                  System.out.println("Egg.Yolk()");                }         }       public Egg()  {              System.out.println("New Egg()");              Yolk y = new Yolk();        }}public class BigEgg extends Egg {       public class Yolk    {                 public Yolk()  {                     System.out.println("BigEgg.Yolk()");                  }           }       public static void main(String[] args)    {              new BigEgg();           }}
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