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();
	}
	
}