Analysis of methods to implement scheduled tasks using Java Schedule

schedule(task, time)

task-the scheduled task time-the time to execute the task

Function: execute when the time is equal to or exceeds time and only execute once

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
 
public class MyTimerTask extends TimerTask {
    private Integer cout = 0;
    @Override
    public void run() {
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss");
        System.out.println("Current Time："+format.format(calendar.getTime()));//获取当前系统时间
        System.out.println("NO.1");
    }
    public static void main(String[] args) {
        MyTimerTask task = new MyTimerTask();
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss");
        System.out.println(format.format(calendar.getTime()));
        calendar.add(Calendar.SECOND,3);//获取距离当前时间3秒后的时间
        Timer timer = new Timer();
        timer.schedule(task,calendar.getTime());
 
    }
}

schedule(task, time, period)

task-the task to be scheduled for execution time-the time when the task is first executed period-the time interval for executing a task, in milliseconds

Function: Execute the task for the first time when the time is equal to or exceeds time, and then execute the task repeatedly every period milliseconds

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
 
public class MyTimerTask extends TimerTask {
    private Integer cout = 0;
    @Override
    public void run() {
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss");
        System.out.println("Current Time："+format.format(calendar.getTime()));//获取当前系统时间
        System.out.println("NO.1");
    }
    public static void main(String[] args) {
        MyTimerTask task = new MyTimerTask();
        Calendar calendar= Calendar.getInstance();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss");
        System.out.println(format.format(calendar.getTime()));
        calendar.add(Calendar.SECOND,3);//获取距离当前时间3秒后的时间
        Timer timer = new Timer();
       //timer.schedule(task,calendar.getTime());
        timer.schedule(task,calendar.getTime(),2000);
    }
}

schedule(task,delay)

task-the task to be scheduled delay-before executing the task Delay time, unit milliseconds

Function: Execute task only once after waiting for delay milliseconds

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
 
public class MyTimerTask extends TimerTask {
    @Override
    public void run() {
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss");
        System.out.println("Current Time："+format.format(calendar.getTime()));//获取当前系统时间
        System.out.println("NO.1");
    }
    public static void main(String[] args) {
        MyTimerTask task = new MyTimerTask();
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss");
        System.out.println(format.format(calendar.getTime()));
        //calendar.add(Calendar.SECOND,3);//获取距离当前时间3秒后的时间
        Timer timer = new Timer();
        //timer.schedule(task,calendar.getTime());
        //timer.schedule(task,calendar.getTime(),2000);
        timer.schedule(task,2000);
    }
}

schedule(task, delay,period)

Function: Wait for delay milliseconds After executing the task for the first time, execute the task repeatedly every period milliseconds

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
 
public class MyTimerTask extends TimerTask {
    @Override
    public void run() {
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss");
        System.out.println("Current Time："+format.format(calendar.getTime()));//获取当前系统时间
        System.out.println("NO.1");
    }
    public static void main(String[] args) {
        MyTimerTask task = new MyTimerTask();
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss");
        System.out.println(format.format(calendar.getTime()));
        //calendar.add(Calendar.SECOND,3);//获取距离当前时间3秒后的时间
        Timer timer = new Timer();
        //timer.schedule(task,calendar.getTime());
        //timer.schedule(task,calendar.getTime(),2000);
        //timer.schedule(task,2000);
        timer.schedule(task,2000,3000);
    }
}

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