Java编程倒计时实现方法示例

        实现Java编程中倒计时的方法有许多，下面我们通过三个示例来简单了解下它的实现过程。

1.简易方式实现

 
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.使用ScheduleExecutor实现

 
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 
 
  
 
} 

3.使用java.util.Timer实现

 
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 
 
 
} 

总结

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