一个Java的接口实例

package interface_demo;

public class Demo4 {
    public static void main(String[] args) {
        Computer c = new Computer();
        Mouse m = new Mouse();
        c.run(m);
    }
}




package interface_demo;

public class Mouse implements USB {

    @Override
    public void run() {
        System.out.println("这是一个鼠标");
        
    }
        
}


package interface_demo;

public class Computer {

//    @Override
    public void open() {
        System.out.println("开机");
    }
    public void close() {
        System.out.println("关机");
    }
    public void run(USB u) {
        u.run();
    }
    
}


package interface_demo;

public interface USB {
    void run();
}

此部分代码来自黑马程序员的B站视频。