Bridge模式

简述：

Bridge模式

与工厂方法不同的是， 其具体的方法实现可以被共享

如下述例子里月饼馅料制作的实现可以被共享

例子：

设计了一个制作月饼的样例，

制作两种月饼一种是椰蓉的，一种是豆沙的，分别使用两个类一个是CoconutMoonCakeImp类，以及BeanPastedMoonCake都实现了MoonCakeImp接口

还使用了一个SuperMoonCake继承自MoonCake，重写了RefineMoonCake（）函数，此函数用来表示加工不同类型月饼的过程

代码：

MoonCakeImp.java 用于制作不同馅料的接口

package design_pattern.bridge;public interface MoonCakeImp {String MakeMoonCake();}

CoconutMoonCakeImp.java 制作椰蓉月饼行为实现类

package design_pattern.bridge;public class CoconutMoonCakeImp implements MoonCakeImp {@Overridepublic String MakeMoonCake() {return "Coconut Moon Cake";}}

BeanPastedMoonCakeImp.java 制作豆沙月饼行为实现类

package design_pattern.bridge;public class BeanPastedMoonCake implements MoonCakeImp{@Overridepublic String MakeMoonCake() {return "Bean Pasted Moon Cake";}}

MoonCake.java 抽象类月饼, 可视为月饼原料和月饼制作实现的抽象

package design_pattern.bridge;public abstract class MoonCake {protected MoonCakeImp moonCakeImp;MoonCake(MoonCakeImp moonCakeImp) {this.moonCakeImp = moonCakeImp;}public void setMoonCakeImp(MoonCakeImp moonCakeImp) {this.moonCakeImp = moonCakeImp;}abstract public void RefineMoonCake();}

SmallMoonCake.java 小型月饼，继承MoonCake抽象类

package design_pattern.bridge;public class SmallMoonCake extends MoonCake {protected int size = 1;SmallMoonCake(MoonCakeImp moonCakeImp) {super(moonCakeImp);}@Overridepublic void RefineMoonCake() {System.out.println(moonCakeImp.MakeMoonCake() + "'s size is " + size);}}

SuperMoonCake.java 大型月饼，继承MoonCake抽象类

package design_pattern.bridge;//use size 10 to represent the size of the moon cakepublic class SuperMoonCake extends MoonCake {protected int size = 10;SuperMoonCake(MoonCakeImp moonCakeImp) {super(moonCakeImp);}@Overridepublic void RefineMoonCake() {System.out.println(moonCakeImp.MakeMoonCake() + "'s size is " + size);}}

TestBridge.java 测试类

package design_pattern.bridge;public class TestBridge {public static void main(String[] args) {//Make Super Coconut Moon CakeMoonCakeImp coconutCakeImp = new CoconutMoonCakeImp();SuperMoonCake superCoconutMoonCake = new SuperMoonCake(coconutCakeImp);superCoconutMoonCake.RefineMoonCake();//Make Super Bean Pasted Moon Cake;MoonCakeImp beanPastedMoonCake = new BeanPastedMoonCake();SmallMoonCake superBeanPastedMoonCake = new SmallMoonCake(beanPastedMoonCake);superBeanPastedMoonCake.RefineMoonCake();}}

输出：