java-learning/java-multithread/src/main/java/com/brianway/learning/java/multithread/timer/example4/Run4_scheduleAtFixedRate2.java at master · ping-sun/java-learning

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package com.brianway.learning.java.multithread.timer.example4;

/**

* Created by brian on 2016/4/15.

import java.util.Timer;

import java.util.TimerTask;

/**

* P258

* scheduleAtFixedRate(TimerTask task, long delay, long period)方法

* long类型

* 不延时的情况下，若执行任务未被延时，第一次执行是任务开始+delay，下次执行任务的开始时间是上一次任务的开始时间加上period

public class Run4_scheduleAtFixedRate2 {

static public class MyTask extends TimerTask {

@Override

public void run() {

try {

System.out.println("begin timer=" + System.currentTimeMillis());

Thread.sleep(1000);

System.out.println("end timer=" + System.currentTimeMillis());

} catch (InterruptedException e) {

e.printStackTrace();

}

public static void main(String[] args) {

MyTask task = new MyTask();

System.out.println("当前时间：" + System.currentTimeMillis());

Timer timer = new Timer();

timer.scheduleAtFixedRate(task, 3000, 4000);

}

输出：

当前时间：1460738574939

begin timer=1460738577940

end timer=1460738578940

begin timer=1460738581940

end timer=1460738582940

begin timer=1460738585940

end timer=1460738586940