JAVA 用接口模拟打印机，u盘接入USB

 1 package Demo512;
 2 
 3 import com.sun.org.apache.xml.internal.serialize.Printer;
 4 
 5 public class TestUsb {
 6     public static void main(String[] args) {
 7         Computer com= new Computer();
 8         com.doWord(new printer());
 9         com.doWord(new Flash());
10 //        Flash f=new Flash();
11 //        com.doWord(f);
12         //实现了接口的匿名类的对象
13     }
14 }
15 interface Usb{
16     void start();
17     void stop();
18 }
19 class Computer{
20     public void doWord(Usb usb){
21         usb.start();
22         System.out.println("==此设备开始操作==");
23         usb.stop();
24     }
25 }
26 class printer implements Usb{
27 
28     @Override
29     public void start() {
30         System.out.println("打印机开始工作");
31     }
32 
33     @Override
34     public void stop() {
35         System.out.println("打印机结束工作");
36     }
37 }
38 class Flash implements Usb{
39 
40     @Override
41     public void start() {
42         System.out.println("u盘开始工作");
43     }
44 
45     @Override
46     public void stop() {
47         System.out.println("u盘停止工作");
48     }
49 }

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