桥接模式

桥接模式：把抽象（abstraction）与行为实现（implementation）分离开来，从而可以保持各部分的独立性以及应对它们的功能扩展。其实我们经常用的mvc就是典型的桥接模式：

package com.jerry.design.bridge; // 测试类 public class Test { public static void main(String[] args) { Dao dao = new DaoImpl(); Service service = new serviceImpl(dao); service.serviceMethod(); } } interface Service{ public void serviceMethod(); } interface Dao{ public void daoMethod(); } class DaoImpl implements Dao{ @Override public void daoMethod() { System.out.println("i am a daoImpl daoMethod()!"); } } class serviceImpl implements Service{ public Dao dao; public serviceImpl(Dao dao) { super(); this.dao = dao; } @Override public void serviceMethod() { dao.daoMethod(); } }