细说多线程之Thread VS Runnable

 1 import java.io.File;
 2 import java.io.FileOutputStream;
 3 import java.io.OutputStream;
 4 import java.util.Scanner;
 5 
 7 public class DaemonThreadDemo {
 8     
 9     public static void main(String[] args) {
10         System.out.println("进入主线程:" + Thread.currentThread().getName());
11         
12         DaemonThread daemonThread = new DaemonThread();
13         Thread thread = new Thread(daemonThread);
14         thread.setDaemon(true);
15         thread.start();
16         
17         // 从键盘接收输入，
18         Scanner sc = new Scanner(System.in);
19         sc.next();  // 主线程就会阻塞住了
20         // 一旦我们执行了输入操作，阻塞就会解除掉。主线程会继续执行。然后打印下面一行数据。
21         
22         System.out.println("退出主线程:" + Thread.currentThread().getName());
23     }
24 }
25 
26 class DaemonThread implements Runnable {
27 
28     @Override
29     public void run() {
30         // TODO Auto-generated method stub
31         System.out.println("进入守护线程:" + Thread.currentThread().getName());
32         try {
33             writeToFile();
34         } catch (Exception e) {
35             e.printStackTrace();
36         }
37         System.out.println("退出守护线程:" + Thread.currentThread().getName());
38     }
39     
40     private void writeToFile() throws Exception {
41         File filename = new File("b:" + File.separator + "daemon.txt");
42         OutputStream os = new FileOutputStream(filename, true);
43         int count = 0;
44         while(count < 999) {
45             os.write(("\r\nword" + count).getBytes());
46             System.out.println("守护线程" + Thread.currentThread().getName()
47                     + "向文件中写入word" + count++);
48             Thread.sleep(1000);
49         }
50     }
51     
52 }