JAVA实现创建定时任务(Timer,GregorianCalendar运用)

package com.liangrui;

import java.util.*;


public class TimerTaskTest {
    public static void main(String[] args) {
        Timer timer=new Timer();
        //注意：月份是实际月份减一
        Calendar calendar=new GregorianCalendar(2021,9,20,14,30,30);
        System.out.println(calendar.getTime());
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                System.out.println("hello world!");
            }
        },calendar.getTime());
    }
}