设计模式---适配器模式

/**  * @author Rollen-Holt 设计模式之 配器模式  */  interface window{     void open();     void close();     void activated();     void iconified(); }   abstract class WindowAdapter{     public void open(){       }     public void close(){       }     public void activated(){               }     public void iconified(){               } }   class AdapterDemo extends WindowAdapter{     public void open(){         System.out.println("打开窗口");     }     public void close(){         System.out.println("关闭窗口");     } }   class hello{     public static void main(String[] a){         AdapterDemo a1=new AdapterDemo();         a1.open();         a1.close();     } }