前面我们已经学习了使用ThreadPoolExecutor类来实现自动创建和运行线程。但是那些线程都是一提交就会运行
，我们有时候希望不要一提交就运行，而是延迟一段时间或者周期性的运行某个任务，这样我们该怎么办呢，下面就介
绍这个类ScheduledThreadPoolExecutor，他就能帮助我们实现这样的效果，代码如下。
package com.bird.concursey.charpet7;import java.util.Date;import java.util.concurrent.Callable;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledThreadPoolExecutor;import java.util.concurrent.TimeUnit;public class Task implements Callable<String> { private String name; public Task(String name) { super(); this.name = name; } @Override public String call() throws Exception { System.out.printf("%s: Starting at : %s\n",name,new Date()); return "hello world"; } public static void main(String[] args) { ScheduledThreadPoolExecutor executor = (ScheduledThreadPoolExecutor) Executors.newScheduledThreadPool(1); System.out.printf("Main: Starting at: %s\n",new Date()); for(int i = 0; i < 5; i++) { Task task = new Task("Task " + i); executor.schedule(task, i, TimeUnit.SECONDS); } executor.shutdown(); try { executor.awaitTermination(1, TimeUnit.DAYS); } catch (InterruptedException e) { e.printStackTrace(); } System.out.printf("Main: Ends at: %s\n",new Date()); }}可以看到运行结果
Main: Starting at: Fri Sep 26 21:59:50 CST 2014Task 0: Starting at : Fri Sep 26 21:59:50 CST 2014Task 1: Starting at : Fri Sep 26 21:59:51 CST 2014Task 2: Starting at : Fri Sep 26 21:59:52 CST 2014Task 3: Starting at : Fri Sep 26 21:59:53 CST 2014Task 4: Starting at : Fri Sep 26 21:59:54 CST 2014Main: Ends at: Fri Sep 26 21:59:54 CST 2014虽然都是同时提交的任务，dan'shi
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