传统定时器

定时器(Timer)


   

例1:写一个五秒后就输出一个结果,并打印出时间:

        schedule(TimerTask task, Date time) 
              安排在指定的时间执行指定的任务。

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

public class ThreadTimerTest {

	public static void main(String[] args) {
		new Timer().schedule(new TimerTask() {
			
			public void run() {
				System.out.println("bombing!");				
			}
		},5000); 
		while(true){
			System.out.println(new Date().getSeconds());
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
}

运行结果为:

    7

    8

    9

    10

    11

    bombing!

例2:第一次5秒后输出结果,以后每2秒输出结果,并打印出时间:

    schedule(TimerTask task, Date firstTime, long period) 
          安排指定的任务在指定的时间开始进行重复的固定延迟执行

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

public class ThreadTimerTest {

	public static void main(String[] args) {
		new Timer().schedule(new TimerTask() {
			
			public void run() {
				System.out.println("bombing!");				
			}
		},5000,2000); 
		while(true){
			System.out.println(new Date().getSeconds());
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
}

运行结果为:

    35
    36
    37
    38
    39
    bombing!
    40
    41
    bombing!
    42
    43

    bombing!



例3:每2秒打印一下:需要创建一个类来继承TimerTask()来实现

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

public class ThreadTimerTest {

	public static void main(String[] args) {
		/*
		new Timer().schedule(new TimerTask() {
			
			public void run() {
				System.out.println("bombing!");				
			}
		},5000,2000); 
		*/
		class MyTimerTask extends TimerTask{

				public void run() {
					System.out.println("bombing!");
					new Timer().schedule(new MyTimerTask(),2000);
				}
		}
		new Timer().schedule(new MyTimerTask(),2000); 
		while(true){
			System.out.println(new Date().getSeconds());
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
}

运行结果为:



37
38
bombing!
39
40
bombing!
41
42

bombing!

猜你喜欢

转载自blog.csdn.net/pengzhisen123/article/details/80240611