Java怎么实现倒计时时分秒

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package com.test;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Timer;import java.util.TimerTask;/** * 多任务定时器 *  * */public class Testsss {         public final static Map map = new HashMap<>();                        public static void main(String[] args) {                String nowdate = "2019-09-09 10:28:17";                String startdate = "2019-09-09 10:28:20";                Date  nowdate1 = parseToDateTime(nowdate,"yyyy-MM-dd HH:mm:ss");                Date  startdate1 = parseToDateTime(startdate,"yyyy-MM-dd HH:mm:ss");                                  String nowdate2 = "2019-09-09 10:20:17";                String startdate2 = "2019-09-09 10:20:21";                Date  nowdate12 = parseToDateTime(nowdate2,"yyyy-MM-dd HH:mm:ss");                Date  startdate12 = parseToDateTime(startdate2,"yyyy-MM-dd HH:mm:ss");                                int deff =  getBetweenTimes(nowdate1,startdate1);                System.out.println(deff);                int deff2 =  getBetweenTimes(nowdate12,startdate12);                System.out.println(deff2);                map.put("id1", String.valueOf(deff));                map.put("id2", String.valueOf(deff2));                                Timer timer = new Timer();                timer.schedule(new TimerTask() {                        @Override                        public void run() {                                System.out.println("timer ....");                                Iterator entries = map.entrySet().iterator();                                while (entries.hasNext()) {                                        Map.Entry entry = (Map.Entry) entries.next();                                        String taskId = (String)entry.getKey();                                        String time = (String)entry.getValue();                                        int times = Integer.parseInt(time);                                        if(times>=0) {                                                times--;                                                map.put(taskId,String.valueOf(times));                                                System.out.println(taskId+"->"+framt(Integer.parseInt(time)));                                        }else {                                                map.remove(taskId);                                        }                                        if(map.size()==0) {                                                System.out.println("done");                                                timer.cancel();                                        }                                }                        }                                        },0,1000);                                                                         }                        /**         * 秒转时分秒         *          * @param seconds         */        public static String framt(int seconds) {                int temp=0;                StringBuffer sb=new StringBuffer();                temp = seconds/3600;                sb.append((temp<10)?"0"+temp+":":""+temp+":");                temp=seconds%3600/60;                sb.append((temp<10)?"0"+temp+":":""+temp+":");                temp=seconds%3600%60;                sb.append((temp<10)?"0"+temp:""+temp);                return sb.toString();                        }                /**         * 将字符串转换为指定格式的日期时间         *          * @param strDate         *            日期字符串         * @param pattern         *            日期格式，与strDate格式匹配         */        public static Date parseToDateTime(String strDate, String pattern) {                try {                        return new SimpleDateFormat(pattern).parse(strDate);                } catch (ParseException e) {                        e.printStackTrace();                }                return null;        }                /**         * 时间差 秒         * */        public static int getBetweenTimes(Date start, Date end) {                long times = end.getTime() - start.getTime();                return (int) times / 1000;        }}

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