자바 의 타이머 사용 방식 4 가지

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();
  }

  //      ：      task     time   schedule(TimerTask task, Date time)
  public static void timer1() {
    Timer timer = new Timer();
    timer.schedule(new TimerTask() {
      public void run() {
        System.out.println("-------       --------");
      }
    }, 2000);//        time,   2000  
  }

  //      ：      task     delay       peroid   
  // 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("-------       --------");
      }
    }, 1000, 5000);
  }

  //      ：      task     delay       peroid   。
  // 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("-------       --------");
      }
    }, 1000, 2000);
  }

  //      ：       task      firstTime           period  ．
  // Timer.scheduleAtFixedRate(TimerTask task,Date firstTime,long period)
  public static void timer4() {
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, 12); //    
    calendar.set(Calendar.MINUTE, 0);    //    
    calendar.set(Calendar.SECOND, 0);    //    

    Date time = calendar.getTime();     //          ,      12：00：00

    Timer timer = new Timer();
    timer.scheduleAtFixedRate(new TimerTask() {
      public void run() {
        System.out.println("-------       --------");
      }
    }, time, 1000 * 60 * 60 * 24);//              
  }
}