Anonymous Inner Class (匿名内部类)

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

  

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    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

  

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

  

上面这个匿名类就是继承了ＷｉｎｄｏｗＡｄａｐｔｅｒ这个抽象类。