如何进行倒计时&；blackberry storm的java计数应用程序

您好，我想创建一个黑莓应用程序，用于倒计时和倒计时，例如，如果您输入您的出生日期，它应该会生成多少年、月、日、小时和分钟过去了，我想知道如何创建正确的逻辑来创建此应用程序。提前感谢……

使用基本的Java SE 6 API，您最好的选择是。它也可以在中找到。因为没有内置的工具来计算周期，所以只需要大量的代码来正确计算经过的时间。您需要克隆日历实例，并在计数循环中添加年、月和日，直到它到达结束日期。你不能只除以秒，因为这不包括闰年，白天的储蓄和诸如此类的东西。计算完后，你可以按照通常的方式将剩余的时间分为小时、分钟和秒

以下是一个启动示例：

package com.stackoverflow.q2936686;

import java.util.Calendar;

public class ElapsedTimeWithCalendar {

    public static void main(String[] args) throws Exception {
        Calendar birthDate = Calendar.getInstance();
        birthDate.set(1978, 3 - 1, 26, 12, 35, 0); // My birthdate.
        Calendar now = Calendar.getInstance(); // Now.

        Integer[] elapsed = new Integer[6];
        Calendar clone = (Calendar) birthDate.clone(); // Otherwise changes are been reflected.
        elapsed[0] = elapsed(clone, now, Calendar.YEAR);
        clone.add(Calendar.YEAR, elapsed[0]);
        elapsed[1] = elapsed(clone, now, Calendar.MONTH);
        clone.add(Calendar.MONTH, elapsed[1]);
        elapsed[2] = elapsed(clone, now, Calendar.DATE);
        clone.add(Calendar.DATE, elapsed[2]);
        elapsed[3] = (int) (now.getTimeInMillis() - clone.getTimeInMillis()) / 3600000;
        clone.add(Calendar.HOUR, elapsed[3]);
        elapsed[4] = (int) (now.getTimeInMillis() - clone.getTimeInMillis()) / 60000;
        clone.add(Calendar.MINUTE, elapsed[4]);
        elapsed[5] = (int) (now.getTimeInMillis() - clone.getTimeInMillis()) / 1000;

        System.out.format("%d years, %d months, %d days, %d hours, %d minutes, %d seconds%n", elapsed);
    }

    private static int elapsed(Calendar before, Calendar after, int field) {
        Calendar clone = (Calendar) before.clone(); // Otherwise changes are been reflected.
        int elapsed = -1;
        while (!clone.after(after)) {
            clone.add(field, 1);
            elapsed++;
        }
        return elapsed;
    }

}

非常详细，是的。然而，在JavaSE7中，一个新的日期和时间API即将出现（），它将与当前可用的API类似。下面是一个使用JodaTime的启动示例：

DateTime birthDate = new DateTime(1978, 3, 26, 12, 35, 0, 0);
DateTime now = new DateTime();
Period elapsed = new Period(birthDate, now);

PeriodFormatter formatter = new PeriodFormatterBuilder()
    .appendYears().appendSuffix(" years, ")
    .appendMonths().appendSuffix(" months, ")
    .appendDays().appendSuffix(" days, ")
    .appendHours().appendSuffix(" hours, ")
    .appendMinutes().appendSuffix(" minutes, ")
    .appendSeconds().appendSuffix(" seconds")
    .toFormatter();

System.out.println(formatter.print(elapsed));

---

有什么不同，嗯？：）

使用基本的JavaSE6API，您最好的选择是。它也可以在中找到。因为没有内置的工具来计算周期，所以只需要大量的代码来正确计算经过的时间。您需要克隆日历实例，并在计数循环中添加年、月和日，直到它到达结束日期。你不能只除以秒，因为这不包括闰年，白天的储蓄和诸如此类的东西。计算完后，你可以按照通常的方式将剩余的时间分为小时、分钟和秒

以下是一个启动示例：

package com.stackoverflow.q2936686;

import java.util.Calendar;

public class ElapsedTimeWithCalendar {

    public static void main(String[] args) throws Exception {
        Calendar birthDate = Calendar.getInstance();
        birthDate.set(1978, 3 - 1, 26, 12, 35, 0); // My birthdate.
        Calendar now = Calendar.getInstance(); // Now.

        Integer[] elapsed = new Integer[6];
        Calendar clone = (Calendar) birthDate.clone(); // Otherwise changes are been reflected.
        elapsed[0] = elapsed(clone, now, Calendar.YEAR);
        clone.add(Calendar.YEAR, elapsed[0]);
        elapsed[1] = elapsed(clone, now, Calendar.MONTH);
        clone.add(Calendar.MONTH, elapsed[1]);
        elapsed[2] = elapsed(clone, now, Calendar.DATE);
        clone.add(Calendar.DATE, elapsed[2]);
        elapsed[3] = (int) (now.getTimeInMillis() - clone.getTimeInMillis()) / 3600000;
        clone.add(Calendar.HOUR, elapsed[3]);
        elapsed[4] = (int) (now.getTimeInMillis() - clone.getTimeInMillis()) / 60000;
        clone.add(Calendar.MINUTE, elapsed[4]);
        elapsed[5] = (int) (now.getTimeInMillis() - clone.getTimeInMillis()) / 1000;

        System.out.format("%d years, %d months, %d days, %d hours, %d minutes, %d seconds%n", elapsed);
    }

    private static int elapsed(Calendar before, Calendar after, int field) {
        Calendar clone = (Calendar) before.clone(); // Otherwise changes are been reflected.
        int elapsed = -1;
        while (!clone.after(after)) {
            clone.add(field, 1);
            elapsed++;
        }
        return elapsed;
    }

}

非常详细，是的。然而，在JavaSE7中，一个新的日期和时间API即将出现（），它将与当前可用的API类似。下面是一个使用JodaTime的启动示例：

DateTime birthDate = new DateTime(1978, 3, 26, 12, 35, 0, 0);
DateTime now = new DateTime();
Period elapsed = new Period(birthDate, now);

PeriodFormatter formatter = new PeriodFormatterBuilder()
    .appendYears().appendSuffix(" years, ")
    .appendMonths().appendSuffix(" months, ")
    .appendDays().appendSuffix(" days, ")
    .appendHours().appendSuffix(" hours, ")
    .appendMinutes().appendSuffix(" minutes, ")
    .appendSeconds().appendSuffix(" seconds")
    .toFormatter();

System.out.println(formatter.print(elapsed));

有什么不同，嗯？：）