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HomeJavajavaTutorialSeveral uses of java timer

Several uses of java timer

Dec 16, 2016 pm 01:08 PM
java timer

package com.lid;  
  
import java.util.Calendar;  
import java.util.Date;  
import java.util.Timer;  
import java.util.TimerTask;  
  
public class Test {  
    public static void main(String[] args) {  
        //timer1();  
        timer2();  
        //timer3();  
        //timer4();  
    }  
  
    // 第一种方法:设定指定任务task在指定时间time执行 schedule(TimerTask task, Date time)  
    public static void timer1() {  
        Timer timer = new Timer();  
        timer.schedule(new TimerTask() {  
            public void run() {  
                System.out.println("-------设定要指定任务--------");  
            }  
        }, 2000);// 设定指定的时间time,此处为2000毫秒  
    }  
  
    // 第二种方法:设定指定任务task在指定延迟delay后进行固定延迟peroid的执行  
    // schedule(TimerTask task, long delay, long period)  
    public static void timer2() {  
        Timer timer = new Timer();  
        timer.schedule(new TimerTask() {  
            public void run() {  
                System.out.println("-------设定要指定任务--------");  
            }  
        }, 1000, 1000);  
    }  
  
    // 第三种方法:设定指定任务task在指定延迟delay后进行固定频率peroid的执行。  
    // scheduleAtFixedRate(TimerTask task, long delay, long period)  
    public static void timer3() {  
        Timer timer = new Timer();  
        timer.scheduleAtFixedRate(new TimerTask() {  
            public void run() {  
                System.out.println("-------设定要指定任务--------");  
            }  
        }, 1000, 2000);  
    }  
     
    // 第四种方法:安排指定的任务task在指定的时间firstTime开始进行重复的固定速率period执行.  
    // Timer.scheduleAtFixedRate(TimerTask task,Date firstTime,long period)  
    public static void timer4() {  
        Calendar calendar = Calendar.getInstance();  
        calendar.set(Calendar.HOUR_OF_DAY, 12); // 控制时  
        calendar.set(Calendar.MINUTE, 0);       // 控制分  
        calendar.set(Calendar.SECOND, 0);       // 控制秒  
  
        Date time = calendar.getTime();         // 得出执行任务的时间,此处为今天的12:00:00  
  
        Timer timer = new Timer();  
        timer.scheduleAtFixedRate(new TimerTask() {  
            public void run() {  
                System.out.println("-------设定要指定任务--------");  
            }  
        }, time, 1000 * 60 * 60 * 24);// 这里设定将延时每天固定执行  
    }  
}



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