JAVA 用接口模拟打印机，u盘接入USB

佚名 6年前 (2019-05-12) 随笔 1258人围观抢沙发百度已收录

 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 }