桥接模式(bridge),顾名思义,在两个有关系的物体之间搭建一座桥,两者之间可以相互独立,降低耦合,解决了继承之间的强依赖关系。
举个例子:现在有很多的电子产品,比如手机、平板等,而又有很多的生产厂商,比如苹果、小米等。如果使用多重继承的话,类是以乘积增长的,而如果用桥接模式类是以和的方式增加的。显然可以降低类的个数。
桥接模式是将抽象和实现解耦,使它们可以独立地变化。这里有抽象和实现两个概念,并不是说实现这个抽象。还是以上面的例子来说明,电子产品是抽象的产品,而生产厂商则是对应的实现。
下面直接给出代码,写的比较简单。UML图自己画吧:
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//ElectronicProduct.java package org.uestc.bridge; public abstract class ElectronicProduct { Manufacturer manufacturer; public ElectronicProduct(Manufacturer manufacturer) { this.manufacturer = manufacturer; } public void GetBrand() { this.manufacturer.GetBrand(); //System.out.println(") } } class Phone extends ElectronicProduct { public Phone(Manufacturer manufacturer) { super(manufacturer); } public void GetBrand() { manufacturer.GetBrand(); System.out.println("phone"); } } class Pad extends ElectronicProduct { public Pad(Manufacturer manufacturer) { super(manufacturer); } public void GetBrand() { manufacturer.GetBrand(); System.out.println("pad"); } }
//Manufacture.java package org.uestc.bridge; public interface Manufacturer { void GetBrand(); } class Apple implements Manufacturer { @Override public void GetBrand() { System.out.print("Apple's "); } } class XiaoMi implements Manufacturer { @Override public void GetBrand() { // TODO Auto-generated method stub System.out.print("xiaomi's "); } }
//client.java package org.uestc.bridge; public class Client { public static void main(String[] args) { ElectronicProduct iphone = new Phone(new Apple()); iphone.GetBrand(); ElectronicProduct xiaoMiPad = new Pad(new XiaoMi()); xiaoMiPad.GetBrand(); } }
Apple's phone xiaomi's pad
原文地址:http://blog.csdn.net/zy416548283/article/details/41734143