我们鼠标和键盘实现USB接口，那么我们鼠标和键盘就变成了USB设备，这时候我们就可以把它放到笔记本电脑里面去用
1 package com.biggw.day10.demo07;
2
3 /**
4 * @author gw
5 * @date 2019/11/2 0002 下午 16:46
6 */
7 public class Computer {
8 public void open() {
9 System.out.println("打开电脑!");
10 }
11
12 public void close() {
13 System.out.println("关闭电脑!");
14 }
15
16 public void useDevice(Usb usb) {
17 if (usb instanceof KeyBorad) {
18 KeyBorad keyBorad = (KeyBorad) usb;
19 keyBorad.open();
20 keyBorad.type();
21 keyBorad.close();
22 } else if (usb instanceof Mouse) {
23 Mouse mouse = (Mouse) usb;
24 mouse.open();
25 mouse.click();
26 mouse.close();
27 }
28 }
29 }
1 package com.biggw.day10.demo07;
2
3 /**
4 * @author gw
5 * @date 2019/11/2 0002 下午 16:42
6 */
7 public interface Usb {
8 public abstract void open();
9
10 public abstract void close();
11 }
1 package com.biggw.day10.demo07;
2
3 /**
4 * @author gw
5 * @date 2019/11/2 0002 下午 16:44
6 */
7 public class Mouse implements Usb {
8 @Override
9 public void open() {
10 System.out.println("打开鼠标！");
11 }
12
13 @Override
14 public void close() {
15 System.out.println("关闭鼠标!");
16 }
17
18 public void click() {
19 System.out.println("点击鼠标!");
20 }
21 }
1 package com.biggw.day10.demo07;
2
3 /**
4 * @author gw
5 * @date 2019/11/2 0002 下午 16:43
6 */
7 public class KeyBorad implements Usb {
8 @Override
9 public void open() {
10 System.out.println("打开键盘!");
11 }
12
13 @Override
14 public void close() {
15 System.out.println("关闭键盘!");
16 }
17
18 public void type() {
19 System.out.println("键盘输入文字!");
20 }
21 }
1 package com.biggw.day10.demo07;
2
3 /**
4 * @author gw
5 * @date 2019/11/2 0002 下午 16:52
6 */
7 public class Main {
8 public static void main(String[] args) {
9 Usb usb = new KeyBorad();
10 Usb usb1 = new Mouse();
11
12 Computer computer = new Computer();
13 computer.open();
14 computer.useDevice(usb);
15 computer.useDevice(usb1);
16 computer.close();
17
18 /*点击鼠标!
19 打开电脑!
20 打开键盘!
21 键盘输入文字!
22 关闭键盘!
23 打开鼠标！
24 关闭鼠标!
25 关闭电脑!*/
26 }
27 }
kage com.biggw.day10.demo07;/** * @author gw * @date 2019/11/2 0002 下午 16:52 */public class Main { public static void main(String[] args) { Usb usb = new KeyBorad(); Usb usb1 = new Mouse(); Computer computer = new Computer(); computer.open(); computer.useDevice(usb); computer.useDevice(usb1); computer.close(); /*点击鼠标!打开电脑!打开键盘!键盘输入文字!关闭键盘!打开鼠标！ 关闭鼠标!关闭电脑!*/}}