【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();
    }
}