Java 實現倒計時（由秒計算天、小時、分鐘、秒）__Java

有時候會要求實現這樣一個需求：

天、小時、分鐘、秒的數值都是隔開的，伺服器端只返回一個時間戳記長度。

以下就是我的實現方案，力求減少對象產生、減小計算量：

import java.util.Timer;import java.util.TimerTask;public class CountDownUtils {private static long day = 0;private static long hour = 0;private static long minute = 0;private static long second = 0;private static boolean dayNotAlready = false;private static boolean hourNotAlready = false;private static boolean minuteNotAlready = false;private static boolean secondNotAlready = false;public static void main(String[] args) {long totalSeconds = 60 * 60 * 24 * 34 + 21;initData(totalSeconds);new Timer().schedule(new TimerTask() {public void run() {if (secondNotAlready) {startCount();} else {cancel();}}}, 0, 1000);}/** * 初始化賦值 *  * @param totalSeconds */private static void initData(long totalSeconds) {resetData();if (totalSeconds > 0) {secondNotAlready = true;second = totalSeconds;if (second >= 60) {minuteNotAlready = true;minute = second / 60;second = second % 60;if (minute >= 60) {hourNotAlready = true;hour = minute / 60;minute = minute % 60;if (hour > 24) {dayNotAlready = true;day = hour / 24;hour = hour % 24;}}}}System.out.println("初始格式化後——>" + day + "天" + hour + "小時" + minute+ "分鐘" + second + "秒");}private static void resetData() {day = 0;hour = 0;minute = 0;second = 0;dayNotAlready = false;hourNotAlready = false;minuteNotAlready = false;secondNotAlready = false;}/** * 計算各個值的變動 *  */public static void startCount() {if (secondNotAlready) {if (second > 0) {second--;if (second == 0 && !minuteNotAlready) {secondNotAlready = false;}} else {if (minuteNotAlready) {if (minute > 0) {minute--;second = 59;if (minute == 0 && !hourNotAlready) {minuteNotAlready = false;}} else {if (hourNotAlready) {if (hour > 0) {hour--;minute = 59;second = 59;if (hour == 0 && !dayNotAlready) {hourNotAlready = false;}} else {if (dayNotAlready) {day--;hour = 23;minute = 59;second = 59;if (day == 0) {dayNotAlready = false;}}}}}}}}System.out.println("距離到期日還有——>" + day + "天" + hour + "小時" + minute+ "分鐘" + second + "秒");}}