记时器

package com.test;

import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class ThreadTest5
{

	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		timerMethod4();
	}

	private static void timerMethod1()
	{
		Timer timer = new Timer();
		System.out.println(Calendar.getInstance().get(Calendar.SECOND));
		timer.schedule(new TimerTask(){
			@Override
			public void run()
			{
				System.out.println(Calendar.getInstance().get(Calendar.SECOND));
				System.out.println("running");
			}
		}, 5000, 2000);
	}
	
	private static void timerMethod2()
	{
		final Timer timer = new Timer();
		System.out.println(Calendar.getInstance().get(Calendar.SECOND));
		class MyTimerTask extends TimerTask{
			@Override
			public void run()
			{
				System.out.println(Calendar.getInstance().get(Calendar.SECOND));
				System.out.println("running");
				timer.schedule(new MyTimerTask(), 3000);
			}
		};
		timer.schedule(new MyTimerTask(), 2000);
		
	}
	
	private static int i = 0;
	private static void timerMethod3()
	{
		final Timer timer = new Timer();
		System.out.println(Calendar.getInstance().get(Calendar.SECOND));
		class MyTimerTask extends TimerTask{
			@Override
			public void run()
			{
				System.out.println(Calendar.getInstance().get(Calendar.SECOND));
				System.out.println("running");
				if(i++ % 2 == 0){
					timer.schedule(new MyTimerTask(), 3000);
				}else{
					timer.schedule(new MyTimerTask(), 2000);
				}
			}
		};
		timer.schedule(new MyTimerTask(), 2000);
		
	}
	
	private static void timerMethod4()
	{
		final ScheduledExecutorService pool = Executors.newScheduledThreadPool(1);
		System.out.println(Calendar.getInstance().get(Calendar.SECOND));
		class MyTask implements Runnable{
			public void run()
			{
				System.out.println(Calendar.getInstance().get(Calendar.SECOND));
				System.out.println("running");
				if(i++ % 2 == 0){
					pool.schedule(new MyTask(), 3, TimeUnit.SECONDS);
				}else{
					pool.schedule(new MyTask(), 2, TimeUnit.SECONDS);
				}
			}
		}
		pool.schedule(new MyTask(), 2, TimeUnit.SECONDS);
		
	}

}