接口下载小练习

package xiazai;

public interface Usb {
String downData();
}

package xiazai;

public class Phone implements Usb {
String pic;


public void downphoto(String name){
    pic=pic+""+name+"下载";
}

    public String downData() {
    
        return pic;
    }

}

package xiazai;

public class Mp4 implements Usb {
String music;
    
    
    public void downmusic(String name){
        music="music:"+name+"正在下载";
    }
    public String downData() {
        
        return music;
    }

}

package xiazai;

public class Computer {
public void connect(Usb u){
    System.out.println("下载数据："+u.downData());
}
}

package xiazai;

public class Test {

    /**
     * 3.电脑可以从U盘，数据相机，mp3等电子设备中下载数据；
     */
    public static void main(String[] args) {
        Computer c=new Computer();
        Mp4 m=new Mp4();
        m.downmusic("我想和你虚度时光");
        c.connect(m);
    }

}