JAVA 用接口模拟打印机，u盘接入USB

package Demo512;

import com.sun.org.apache.xml.internal.serialize.Printer;

public class TestUsb {
    public static void main(String[] args) {
        Computer com= new Computer();
        com.doWord(new printer());
        com.doWord(new Flash());
//        Flash f=new Flash();
//        com.doWord(f);
        //实现了接口的匿名类的对象
    }
}
interface Usb{
    void start();
    void stop();
}
class Computer{
    public void doWord(Usb usb){
        usb.start();
        System.out.println("==此设备开始操作==");
        usb.stop();
    }
}
class printer implements Usb{

    @Override
    public void start() {
        System.out.println("打印机开始工作");
    }

    @Override
    public void stop() {
        System.out.println("打印机结束工作");
    }
}
class Flash implements Usb{

    @Override
    public void start() {
        System.out.println("u盘开始工作");
    }

    @Override
    public void stop() {
        System.out.println("u盘停止工作");
    }
}

运行代码↓