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This article mainly explains the "Java how to achieve the countdown minutes", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "Java how to achieve countdown minutes" bar!

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;/** * multitask timer * * / 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 () }, 0P.1000) } / * seconds turn minute * * @ param seconds * / public static String framt (int seconds) {int temp=0; StringBuffer sb=new StringBuffer () Temp = seconds/3600; sb.append ((temp

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