结构模式之代理模式 静态代理

package com.djk.design.struct.proxy;public interface Action {void buy();}

package com.djk.design.struct.proxy;public class Father implements Action{private Action action;public Father(Action action) {super();this.action = action;}public void buy(){if (null == action){System.out.println("儿子不在家，自己去买");}else{System.out.println("儿子在家，委托儿子去买");action.buy();}}}

package com.djk.design.struct.proxy;public class Son implements Action{@Overridepublic void buy() {System.out.println("老爸叫我去买烟");}}

package com.djk.design.struct.proxy;public class Client {public static void main(String[] args) {Action father = new Father(new Son());father.buy();}}