课堂所讲整理：多态

创建CPU的接口：

package org.hanqi.pn0120;
 
//cpu的接口
public interface ICPU {           　　//创建的接口名一般前面加I
                                     //接口的关键字  interface
    //控制
    public void command();    

}

创建显卡的接口：

package org.hanqi.pn0120;

public interface IDisplayCard {
    
    //显示
    public void display();
}

创建Intel类与ICPU相关联：

package org.hanqi.pn0120;

public class Intel implements ICPU {                 //相关联的关键字 implements

    @Override
    public void command() {

        System.out.println("我是Intel的CPU");
    }
}

创建AMD类与ICPU相关联：

package org.hanqi.pn0120;

public class AMD implements ICPU {

    @Override
    public void command() {
        
        System.out.println("我是AMD的CPU");
    }
}

创建AMD2类与ICPU相关联：

package org.hanqi.pn0120;

public class AMD2 implements ICPU, IDisplayCard {

    @Override
    public void display() {
        
        System.out.println("AMD的CPU显卡");

    }

    @Override
    public void command() {
        
        System.out.println("AMD的自带显卡的CPU");
    }
}

创建AMD3类与ICPU相关联：

package org.hanqi.pn0120;

public class AMD3 extends AMD implements IDisplayCard {

    @Override
    public void display() {
        
        System.out.println("继承了AMD的一代CPU，增加了显卡功能");
    }
}

创建Ati类与IDisplayCard相关联：

package org.hanqi.pn0120;

public class Ati implements IDisplayCard {

    @Override
    public void display() {

    System.out.println("我是A卡");

    }
}

创建Nivdia类与IDisplayCard相关联：

package org.hanqi.pn0120;

public class Nivdia implements IDisplayCard {

    @Override
    public void display() {
        
        System.out.println("我是N卡");

    }
}

最后创建Computer类进行输出运算：

package org.hanqi.pn0120;

public class Computer {
    
    //品牌
    private String pinpai;
    
    //CPU
    private ICPU cpu;
    
    //显卡
    private IDisplayCard displaycard;

    public String getPinpai() {
        return pinpai;
    }

    public void setPinpai(String pinpai) {
        this.pinpai = pinpai;
    }

    public ICPU getCpu() {
        return cpu;
    }

    public void setCpu(ICPU cpu) {
        this.cpu = cpu;
    }

    public IDisplayCard getDisplaycard() {
        return displaycard;
    }

    public void setDisplaycard(IDisplayCard displaycard) {
        this.displaycard = displaycard;
    }
    
    //运行
    public void run()
    {
        //cpu
        this.cpu.command();
        //显卡
        this.displaycard.display();
        System.out.println("我组装的"+pinpai+"电脑开始运行");
    }
    
    public Computer(String pinpai)
    {
        super();   
        this.pinpai=pinpai;
    }
    public static void main(String[] args)
    {
        //组装电脑
        Computer c1 = new Computer("hp");
        
        //第一种
        AMD a1 = new AMD();        
        c1.setCpu(a1);
        //第二种  匿名类 new Ati()
        c1.setDisplaycard(new Ati());        
        c1.run();
        
        System.out.println();
        
        Computer c2 = new Computer("华硕");
        c2.setCpu(new Intel());
        c2.setDisplaycard(new Nivdia());
        c2.run();
        
        System.out.println();
        AMD2 a2 = new AMD2();
        Computer c3 = new Computer("acer");
        c3.setCpu(a2);
        c3.setDisplaycard(a2);
        c3.run();
        
        System.out.println();
        AMD3 a3 = new AMD3();
        Computer c4 = new Computer("acer");
        c4.setCpu(a3);
        c4.setDisplaycard(a3);
        c4.run();
    }
}

运行结果为：

附思维导图：