Detailed explanation of how to implement countdown in Java

This article mainly introduces three examples of Java programming countdown implementation. The three implementation methods have certain reference value. Friends in need can learn about it.

There are many ways to implement countdown in Java programming. Let’s briefly understand its implementation process through three examples.

1. Simple way to implement

/** 
* @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); //设置倒计时间隔
  } 
  System.out.println("Time is out"); 
 } 
 //Test 
 public static void main(String[] args) throws InterruptedException { 
  new CountDown(100);   //倒计时起始时间，多少秒
 } 
 
}

2. Use ScheduleExecutor to implement

/** 
* @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. Use java.util.Timer to implement

##

/** 
* @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); 
 }*/ 
 
}

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