【GOF23设计模式】桥接模式

来源：http://www.bjsxt.com/ 
一、【GOF23设计模式】_桥接模式、多层继承结构、银行日志管理、管理系统消息管理、人力资源的奖金计算 

未用桥接模式：

 package com.test.bridge;

 public interface Computer {
     void sale();
 }

 class Desktop implements Computer{
     @Override
     public void sale() {
         System.out.println("销售台式机");
     }
 }
 class Laptop implements Computer{
     @Override
     public void sale() {
         System.out.println("销售笔记本");
     }
 }
 class Pad implements Computer{
     @Override
     public void sale() {
         System.out.println("销售平板电脑");
     }
 }

 class LenovoDesktop extends Desktop{
     @Override
     public void sale(){
         System.out.println("销售联想台式机");
     }
 }
 class LenovoLaptop extends Laptop{
     @Override
     public void sale(){
         System.out.println("销售联想笔记本");
     }
 }
 class LenovoPad extends Pad{
     @Override
     public void sale(){
         System.out.println("销售联想平板电脑");
     }
 }

 class ShenzhouDesktop extends Desktop{
     @Override
     public void sale(){
         System.out.println("销售神舟台式机");
     }
 }
 class ShenzhouLaptop extends Laptop{
     @Override
     public void sale(){
         System.out.println("销售神舟笔记本");
     }
 }
 class ShenzhouPad extends Pad{
     @Override
     public void sale(){
         System.out.println("销售神舟平板电脑");
     }
 }

 class DellDesktop extends Desktop{
     @Override
     public void sale(){
         System.out.println("销售戴尔台式机");
     }
 }
 class DellLaptop extends Laptop{
     @Override
     public void sale(){
         System.out.println("销售戴尔笔记本");
     }
 }
 class DellPad extends Pad{
     @Override
     public void sale(){
         System.out.println("销售戴尔平板电脑");
     }
 }

使用桥接模式：

 package com.test.bridge;
 /**
  * 电脑类型的维度
  */
 public class Computer2 {
     protected Brand brand;

     public Computer2(Brand brand) {
         super();
         this.brand = brand;
     }

     public void sale(){
         brand.sale();
     }
 }

 class Desktop2 extends Computer2{
     public Desktop2(Brand brand) {
         super(brand);
     }
     @Override
     public void sale() {
         super.sale();
         System.out.println("销售台式机");
     }
 }
 class Laptop2 extends Computer2{
     public Laptop2(Brand brand) {
         super(brand);
     }
     @Override
     public void sale() {
         super.sale();
         System.out.println("销售笔记本");
     }
 }

 package com.test.bridge;
 /**
  * 品牌
  */
 public interface Brand {
     void sale();
 }

 class Lenovo implements Brand{
     @Override
     public void sale() {
         System.out.println("销售联想电脑");
     }
 }
 class Dell implements Brand{
     @Override
     public void sale() {
         System.out.println("销售戴尔电脑");
     }
 }
 //新增之前没有的品牌，不用同时新增电脑类型(不用在Computer2中写代码)
 class Shenzhou implements Brand{
     @Override
     public void sale() {
         System.out.println("销售神舟电脑");
     }
 }

 package com.test.bridge;

 public class Client {
     public static void main(String[] args) {
         //销售联想的笔记本电脑
         Computer2 c = new Laptop2(new Lenovo());
         c.sale();

         //销售神舟的笔记本电脑
         Computer2 c2 = new Desktop2(new Shenzhou());
         c2.sale();
     }
 }