详解java倒计时三种简单实现方式

package timer;

import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

/**
 * java演示倒计时
 * 
 */
public class TimeTest {
  public static int time = 60 * 60 * 60;
  public static Calendar c;
  public static long endTime;
  public static Date date;
  public static long startTime;
  public static long midTime;

  public static void main(String[] args) {
    c = Calendar.getInstance();
    c.set(2017,4,17,0);// 注意月份的设置，0-11表示1-12月
    // c.set(Calendar.YEAR,2017);
    // c.set(Calendar.MONTH,4);
    // c.set(Calendar.DAY_OF_MONTH,17);
    // c.set(Calendar.HOUR_OF_DAY,0);
    // c.set(Calendar.MINUTE,0);
    // c.set(Calendar.SECOND,0);
    endTime = c.getTimeInMillis();
    date = new Date();
    startTime = date.getTime();
    midTime = (endTime - startTime) / 1000;

    // time1();//方式一
    time2();// 方式二
    // time3();//方式三
  }

  /**
   * 方式三： 使用java.util.Timer类进行倒计时
   */
  private static void time3() {
    Timer timer = new Timer();
    timer.schedule(new TimerTask() {
      public void run() {
        midTime--;
        long hh = midTime / 60 / 60 % 60;
        long mm = midTime / 60 % 60;
        long ss = midTime % 60;
        System.out.println("还剩" + hh + "小时" + mm + "分钟" + ss + "秒");
      }
    },1000);
  }

  /**
   * 方式二： 设定时间戳，倒计时
   */
  private static void time2() {

    while (midTime > 0) {
      midTime--;
      long hh = midTime / 60 / 60 % 60;
      long mm = midTime / 60 % 60;
      long ss = midTime % 60;
      System.out.println("还剩" + hh + "小时" + mm + "分钟" + ss + "秒");
      try {
        Thread.sleep(1000);

      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
  }

  /**
   * 方式一： 给定时长倒计时
   */
  private static void time1() {
    while (time > 0) {
      time--;
      try {
        Thread.sleep(1000);
        int hh = time / 60 / 60 % 60;
        int mm = time / 60 % 60;
        int ss = time % 60;
        System.out.println("还剩" + hh + "小时" + mm + "分钟" + ss + "秒");
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }

  }
}