java/w5/USBTest.java

package com.example.shape;

interface USB {
    void open();
    void close();
}

class Mouse implements USB {
    @Override
    public void open() {
        System.out.println("鼠标已连接，指示灯亮起");
    }
    @Override
    public void close() {
        System.out.println("鼠标已断开，指示灯熄灭");
    }
    public void click() {
        System.out.println("鼠标点击了一下");
    }
}

class Keyboard implements USB {
    @Override
    public void open() {
        System.out.println("键盘已连接，可正常输入");
    }
    @Override
    public void close() {
        System.out.println("键盘已断开，无法输入");
    }
    public void type() {
        System.out.println("键盘按下了按键");
    }
}

class Computer {
    public void useUSB(USB usb) {
        usb.open();
        if (usb instanceof Mouse) {
            ((Mouse) usb).click();
        } else if (usb instanceof Keyboard) {
            ((Keyboard) usb).type();
        }
        usb.close();
        System.out.println("------------------------");
    }
}

public class USBTest {
    public static void main(String[] args) {
        Computer computer = new Computer();
        USB mouse = new Mouse();
        USB keyboard = new Keyboard();
        System.out.println("=== 插入鼠标 ===");
        computer.useUSB(mouse);
        System.out.println("=== 插入键盘 ===");
        computer.useUSB(keyboard);
    }
}