package com.java.activiti.util;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(2018, 12, 11, 0, 0, 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");            }        }, 0, 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" +  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();            }        }    }}

原文：http://www.cnblogs.com/heizai002/p/6862625.html