java_Timer_schedule jdk自带定时器

定时器经常在项目中用到，定制执行某些操作，比如爬虫就需要定时加载种子等操作，之前一直用spring的定制器
近期做项目发现，jdk有很简单的提供   代码如下

 1 /*
  * Copyright (c) 2014-2024 . All Rights Reserved.
  *
  * This software is the confidential and proprietary information of
  * LoongTao. You shall not disclose such Confidential Information
  * and shall use it only in accordance with the terms of the agreements
  * you entered into with LoongTao.
  *
  */
 package com.loongtao.dmscrawler.temp;

 import java.util.Timer;
 import java.util.TimerTask;

 /**
  * @declare:测试定时器 <br>
  * @author: cphmvp
  * @version: 1.0
  * @date: 2014-3-14上午11:21:36
  */
 public class TimeTest {
     public static void main(String[] args) {
         System.out.println("start");
         new Timer().schedule(new TestTask(), 0, 1000 * 60 * 60);
         System.out.println("end");

     }

     static class TestTask extends TimerTask {
         TestTask() {
             // 空构造器
         }

         @Override
         public void run() {
             System.out.println(1);
         }

     }
 }

jdk源码参考 很容易看懂的 ，不解释

   * @param task   task to be scheduled.
      * @param delay  delay in milliseconds before task is to be executed.
      * @param period time in milliseconds between successive task executions.
      * @throws IllegalArgumentException if <tt>delay</tt> is negative, or
      *         <tt>delay + System.currentTimeMillis()</tt> is negative.
      * @throws IllegalStateException if task was already scheduled or
      *         cancelled, timer was cancelled, or timer thread terminated.
      */
     public void schedule(TimerTask task, long delay, long period) {
         if (delay < 0)
             throw new IllegalArgumentException("Negative delay.");
         if (period <= 0)
             throw new IllegalArgumentException("Non-positive period.");
         sched(task, System.currentTimeMillis()+delay, -period);
     }