任务调度（一）：线程/TimerTask/Timer

1、什么是任务调度

2、JDK任务调度工具

3、线程

public class Demo01 {
    
    
    static long count = 0;
	public static void main(String[] args) {
    
    
		Runnable runnable = new Runnable() {
    
    
			@Override
			public void run() {
    
    
				while (true) {
    
    
					try {
    
    
						Thread.sleep(1000);
						count++;
						System.out.println(count);
					} catch (Exception e) {
    
    
						
					}
				}
			}
		};
		Thread thread = new Thread(runnable);
		thread.start();
	}
}

4、TimerTask

package cn.enjoy.jobs.feiji;

import org.junit.Test;

import java.util.Timer;
import java.util.TimerTask;

/**
 * 使用TimerTask类实现定时任务
*/
public class Demo02 {
    
    
    static long count = 0;




	@Test
	public  void test1() throws InterruptedException {
    
    
		TimerTask timerTask = new TimerTask() {
    
    

			@Override
			public void run() {
    
    
				count++;
				System.out.println(count);
			}
		};

		Timer timer = new Timer();
		// 延迟
		long delay = 0;
		// 秒数
		long period = 1000;
		timer.scheduleAtFixedRate(timerTask, delay, period);

		Thread.sleep(Integer.MAX_VALUE);
	}

	@Test
	public  void test2() throws InterruptedException {
    
    
		TimerTask timerTask = new TimerTask() {
    
    

			@Override
			public void run() {
    
    
				count++;
				System.out.println(count);
			}
		};

		TimerTask timerTask2 = new TimerTask() {
    
    

			@Override
			public void run() {
    
    
				try {
    
    
					Thread.sleep(5000);
				} catch (InterruptedException e) {
    
    
					e.printStackTrace();
				}
				count++;
				System.out.println(count);
			}
		};

		Timer timer = new Timer();

		long delay = 0;
		// 秒数
		long period = 1000;
		timer.scheduleAtFixedRate(timerTask, delay, period);
		timer.scheduleAtFixedRate(timerTask2, delay, period);

		Thread.sleep(Integer.MAX_VALUE);
	}


	@Test
	public  void test3() throws InterruptedException {
    
    
		TimerTask timerTask = new TimerTask() {
    
    

			@Override
			public void run() {
    
    
				count++;
				System.out.println(count);
			}
		};

		TimerTask timerTask3 = new TimerTask() {
    
    

			@Override
			public void run() {
    
    
				count++;
				System.out.println(count);
				if(count ==2) {
    
    
					int i = 10/0;
				}
			}
		};

		Timer timer = new Timer();
		// 天数
		long delay = 0;
		// 秒数
		long period = 1000;
		timer.scheduleAtFixedRate(timerTask, delay, period);
		timer.scheduleAtFixedRate(timerTask3, delay, period);

		Thread.sleep(Integer.MAX_VALUE);
	}

}

下一章：任务调度（二）：ScheduledExecutorService