Anonymous Inner Class (匿名内部类) 是否可以extends(继承)其它类，是否可以implements接口

 

匿名类本身就是通过继承类或者接口来实现的。但是不能再显式的extends 或者implements了。
举个例子：
JFrame frame = new JFrame();
我们为frame添加窗口事件可以采用如下两种方式：

Java code

     
     
     
     

      
      
      
      
       frame.addWindowListener(
      
      
      
      new
      
      
      
       WindowListener() { 
      
      
      
      public
      
      
      
       
      
      
      
      void
      
      
      
       windowOpened(WindowEvent e) { 
      
      
      
      throw
      
      
      
       
      
      
      
      new
      
      
      
       UnsupportedOperationException(
      
      
      
      "
      
      
      
      Not supported yet.
      
      
      
      "
      
      
      
      ); } 
      
      
      
      public
      
      
      
       
      
      
      
      void
      
      
      
       windowClosing(WindowEvent e) { 
      
      
      
      throw
      
      
      
       
      
      
      
      new
      
      
      
       UnsupportedOperationException(
      
      
      
      "
      
      
      
      Not supported yet.
      
      
      
      "
      
      
      
      ); } 
      
      
      
      public
      
      
      
       
      
      
      
      void
      
      
      
       windowClosed(WindowEvent e) { 
      
      
      
      throw
      
      
      
       
      
      
      
      new
      
      
      
       UnsupportedOperationException(
      
      
      
      "
      
      
      
      Not supported yet.
      
      
      
      "
      
      
      
      ); } 
      
      
      
      public
      
      
      
       
      
      
      
      void
      
      
      
       windowIconified(WindowEvent e) { 
      
      
      
      throw
      
      
      
       
      
      
      
      new
      
      
      
       UnsupportedOperationException(
      
      
      
      "
      
      
      
      Not supported yet.
      
      
      
      "
      
      
      
      ); } 
      
      
      
      public
      
      
      
       
      
      
      
      void
      
      
      
       windowDeiconified(WindowEvent e) { 
      
      
      
      throw
      
      
      
       
      
      
      
      new
      
      
      
       UnsupportedOperationException(
      
      
      
      "
      
      
      
      Not supported yet.
      
      
      
      "
      
      
      
      ); } 
      
      
      
      public
      
      
      
       
      
      
      
      void
      
      
      
       windowActivated(WindowEvent e) { 
      
      
      
      throw
      
      
      
       
      
      
      
      new
      
      
      
       UnsupportedOperationException(
      
      
      
      "
      
      
      
      Not supported yet.
      
      
      
      "
      
      
      
      ); } 
      
      
      
      public
      
      
      
       
      
      
      
      void
      
      
      
       windowDeactivated(WindowEvent e) { 
      
      
      
      throw
      
      
      
       
      
      
      
      new
      
      
      
       UnsupportedOperationException(
      
      
      
      "
      
      
      
      Not supported yet.
      
      
      
      "
      
      
      
      ); } }); 
     
     
     
     

这个匿名类就是实现了接口WindowListener
或者：

Java code

     
     
     
     

      
      
      
      
       frame.addWindowListener(
      
      
      
      new
      
      
      
       WindowAdapter() {}); 
     
     
     
     

上面这个匿名类就是继承了ＷｉｎｄｏｗＡｄａｐｔｅｒ这个抽象类。