4 ways to use timers in java

For compatriots who develop game projects, Timer is definitely not unfamiliar. Today I made a small summary of the timing that I often used in the past! There is no specific implementation principle, but only four common usage methods are listed. Relatively speaking, so just follow the examples listed!

import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
 
public class TimeTest {
  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, 5000);
  }
 
  // 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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