多种方式实现倒计时定时器

github链接：https://github.com/Al-assad/Java-Gadgets/tree/master/count_down

1、简易方式实现

/**

* @see

* @author Al_assad yulinying_1994@outlook.com

* @date 2016年10月18日 上午3:10:13

* @version V1.0

* Description: 倒计时简易实现，只用单线程

*/

import java.util.*;

import java.util.concurrent.*;

public class CountDown {

private int limitSec;

public CountDown(int limitSec) throws InterruptedException{

this.limitSec = limitSec;

System.out.println("Count from "+limitSec);

while(limitSec > 0){

System.out.println("remians "+ --limitSec +" s");

TimeUnit.SECONDS.sleep(1);

}

System.out.println("Time is out");

}

//Test

/*public static void main(String[] args) throws InterruptedException {

new CountDown(10);

}*/

}

2、使用ScheduleExecutor实现

/**

* @see

* @author Al_assad yulinying_1994@outlook.com

* @date 2016年10月18日 上午2:14:43

* @version V1.0

* Description: 倒计时实现方式1：使用ScheduledExecutor实现

* 使用两个线程；

*/

import java.util.concurrent.*;

public class CountDown1 {

private volatile int limitSec ; //记录倒计时时间

private int curSec; //记录倒计时当下时间

public CountDown1(int limitSec) throws InterruptedException{

this.limitSec = limitSec;

this.curSec = limitSec;

System.out.println("count down form "+limitSec);

ScheduledExecutorService exec = Executors.newScheduledThreadPool(1);

exec.scheduleAtFixedRate(new Task(),0,1,TimeUnit.SECONDS);

TimeUnit.SECONDS.sleep(limitSec); //暂停本线程

exec.shutdownNow();

System.out.println("Time out！");

}

private class Task implements Runnable{

public void run(){

System.out.println("Time remains "+ --curSec +" s");

}

}

//Test

/*public static void main(String[] args) throws InterruptedException{

new CountDown1(10);

}*/

}

3、使用java.util.Timer实现

/**

* @see

* @author Al_assad yulinying_1994@outlook.com

* @date 2016年10月18日 上午2:47:44

* @version V1.0

* Description: 倒计时实现方式2：使用java.uitl.Timer实现

* 使用两个线程

*/

import java.util.*;

import java.util.concurrent.TimeUnit;

public class CountDown2 {

private int limitSec;

private int curSec;

public CountDown2(int limitSec) throws InterruptedException{

this.limitSec = limitSec;

this.curSec = limitSec;

System.out.println("count down from "+limitSec+" s ");

Timer timer = new Timer();

timer.schedule(new TimerTask(){

public void run(){

System.out.println("Time remians "+ --curSec +" s");

}

},0,1000);

TimeUnit.SECONDS.sleep(limitSec);

timer.cancel();

System.out.println("Time is out!");

}

//Test

/*public static void main(String[] args) throws InterruptedException{

new CountDown2(10);

}*/

}