1 package org.zln.thread;
2
3 import java.util.Date;
4 import java.util.concurrent.ExecutorService;
5 import java.util.concurrent.Executors;
6
7 /**
8 * Created by sherry on 000024/6/24 22:50.
9 */
10 public class TestExecutorService implements Runnable{
11 public static void main(String[] args) {
12 new Thread(new TestExecutorService()).start();
13 System.out.println(new Date()+"主线程结束");
14 }
15
16 /*之所以将for循环写在一个run中，是为了防止线程池等待过程中造成的主线程堵塞*/
17 @Override
18 public void run() {
19 /*创建一个大小为3的线程池*/
20 ExecutorService executorService = Executors.newFixedThreadPool(3);
21 for (int i = 0; i < 20; i++) {
22 Runnable runnable = new Runnable() {
23 @Override
24 public void run() {
25 long time = (long)(Math.random()*1000);
26 System.out.println(new Date()+"休眠："+time+" 毫秒");
27 try {
28 Thread.sleep(time);
29 } catch (InterruptedException e) {
30 e.printStackTrace();
31 }
32 }
33 };
34 /*启动一个线程*/
35 executorService.execute(runnable);
36 }
37 /*线程池必须使用shutdown显示关闭，否则当前线程无法退出*/
38 executorService.shutdown();
39 }
40 }
