JAVA基础多态案例：USB设备模拟

Test测试类：

package InterFace_Implements.DuoTai;

public class Test {
    public static void main(String[] args) {
        //创建电脑对象
        Computer c=new Computer();
        c.Run("拯救者");

        //创建键盘对象
        USB k=new KeyPan("诺必行");
        c.installUSB(k);
        c.uninstallUSB(k);

        //创建鼠标对象
        USB m=new Mouse("飞利浦");
        c.installUSB(m);
        c.uninstallUSB(m);
    }
}

Computer类：

package InterFace_Implements.DuoTai;
//电脑类
public class Computer implements USB{
    private String name;//电脑品牌

    public static void Run(String name){
        System.out.println(name+"开机成功");
    }
    public  void installUSB(USB usb){//电脑安装usb
    usb.connect();
    //独有功能先判断，再强制转换
        if (usb instanceof KeyPan){//判断usb类型是键盘还是鼠标
            KeyPan k=(KeyPan) usb;
            k.KeyDown();
        }else if (usb instanceof Mouse){
            Mouse m=(Mouse) usb;
            m.move("飞利浦");
        }
    }
    public  void uninstallUSB(USB usb){//电脑卸装usb
        usb.unconnect();
        //独有功能先判断，再强制转换
        if (usb instanceof KeyPan){//判断usb类型是键盘还是鼠标
            KeyPan k=(KeyPan) usb;

        }else if (usb instanceof Mouse){
            Mouse m=(Mouse) usb;
        }
    }

    public Computer(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Computer() {
    }

    @Override
    public void connect() {

    }

    @Override
    public void unconnect() {

    }
}

KeyPan类：

package InterFace_Implements.DuoTai;
//键盘类
public class KeyPan implements USB{
    private String name;//键盘名称

    public KeyPan() {
    }

    public KeyPan(String name) {
        this.name = name;
    }
    public  void KeyDown(){
        System.out.println("键盘按下了！！！");
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public void connect() {
        System.out.println("欢迎键盘的到来！！");

    }

    @Override
    public void unconnect() {
        System.out.println("欢迎键盘下次的到来！！");

    }
}

Mouse类：

package InterFace_Implements.DuoTai;
//定义鼠标类
public class Mouse implements USB{
    private String name;//鼠标名称

    public  void move(String name){
        System.out.println(name+"移动了!");
    }

    public Mouse(String name) {//有参数构造器
        this.name = name;
    }

    public Mouse() {//无参数构造器
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public void connect() {
        System.out.println("欢迎鼠标的到来！！");
    }

    @Override
    public void unconnect() {
        System.out.println("欢迎鼠标下次的到来！！");
    }
}
USB接口：

package InterFace_Implements.DuoTai;
//创建USB接口
public interface USB {
    public abstract void connect();//插入usb
    public abstract void unconnect();//拔出usb
}