實(shí)現(xiàn)Java編程中倒計(jì)時(shí)的方法有許多，下面我們通過三個(gè)示例來簡單了解下它的實(shí)現(xiàn)過程。
1.簡易方式實(shí)現(xiàn)
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/** * @see * @author Al_assad yulinying_1994@outlook.com * @date 2016年10月18日 上午3:10:13 * @version V1.0 * Description: 倒計(jì)時(shí)簡易實(shí)現(xiàn)，只用單線程 */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); //設(shè)置倒計(jì)時(shí)間隔 } System.out.println("Time is out"); } //Test public static void main(String[] args) throws InterruptedException { new CountDown(100); //倒計(jì)時(shí)起始時(shí)間，多少秒 } } |
2.使用ScheduleExecutor實(shí)現(xiàn)
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/** * @see * @author Al_assad yulinying_1994@outlook.com * @date 2016年10月18日 上午2:14:43 * @version V1.0 * Description: 倒計(jì)時(shí)實(shí)現(xiàn)方式1：使用ScheduledExecutor實(shí)現(xiàn) * 使用兩個(gè)線程； */import java.util.concurrent.*; public class CountDown1 { private volatile int limitSec ; //記錄倒計(jì)時(shí)時(shí)間 private int curSec; //記錄倒計(jì)時(shí)當(dāng)下時(shí)間 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); //暫停本線程 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實(shí)現(xiàn)
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/** * @see * @author Al_assad yulinying_1994@outlook.com * @date 2016年10月18日 上午2:47:44 * @version V1.0 * Description: 倒計(jì)時(shí)實(shí)現(xiàn)方式2：使用java.uitl.Timer實(shí)現(xiàn) * 使用兩個(gè)線程 */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); }*/ } |
總結(jié)
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原文鏈接：http://blog.csdn.net/al_assad/article/details/52992875
