java-learning/java-multithread/src/main/java/com/brianway/learning/java/multithread/timer/example4/Run4_schedule_vs_scheduleAtFixedRate_1.java at master · psvm-enter/java-learning

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

/**

* Created by brian on 2016/4/15.

import java.util.Calendar;

import java.util.Date;

import java.util.Timer;

import java.util.TimerTask;

/**

* P260

* schedule不具有追赶执行性

public class Run4_schedule_vs_scheduleAtFixedRate_1 {

static public class MyTask extends TimerTask {

@Override

public void run() {

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

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

}

public static void main(String[] args) {

MyTask task = new MyTask();

System.out.println("现在执行时间：" + new Date());

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.SECOND, calendar.get(Calendar.SECOND) - 20);

Date runDate = calendar.getTime();

System.out.println("计划执行时间：" + runDate);

Timer timer = new Timer();

timer.schedule(task, runDate, 2000);

}

输出：

现在执行时间：Sat Apr 16 00:51:36 CST 2016

计划执行时间：Sat Apr 16 00:51:16 CST 2016

begin timer=Sat Apr 16 00:51:36 CST 2016

end timer=Sat Apr 16 00:51:36 CST 2016

begin timer=Sat Apr 16 00:51:38 CST 2016

end timer=Sat Apr 16 00:51:38 CST 2016

begin timer=Sat Apr 16 00:51:40 CST 2016

end timer=Sat Apr 16 00:51:40 CST 2016

begin timer=Sat Apr 16 00:51:42 CST 2016

end timer=Sat Apr 16 00:51:42 CST 2016