Java 添加格式为 dd:HH:mm:ss 的日期

我有三个日期String格式的对象：dd:HH:mm:ss

• 00:1:9:14
• 00:3:10:4
• 00:3:39:49

如何在 Java 中添加这些日期以获得总和（00:7:59:07)?

示例代码：

SimpleDateFormat sdf = new SimpleDateFormat("dd:HH:mm:ss");
Date d1 = sdf.parse("00:1:9:14");
Date d2 = sdf.parse("00:3:10:4");
Date d3 = sdf.parse("00:3:39:49");

System.out.println(d1);
System.out.println(d2);
System.out.println(d3);
Date d = new Date(d1.getTime() + d2.getTime() + d3.getTime());

System.out.println(d);

输出（错误）：

Wed Dec 31 01:09:14 IST 1969
Wed Dec 31 03:10:04 IST 1969
Wed Dec 31 03:39:49 IST 1969
Sun Dec 28 20:59:07 IST 1969

The dd格式包括月份中的日期。所以你的价值00如果你使用的话会下溢SimpleDateFormat（或JavaDate因为它还包括一个月中的某一天）。相反，解析你的时间部分并自己进行数学计算。

例如，您可以创建一个类TimePart with days, hours, minutes and seconds like

static class TimePart {
    int days = 0;
    int hours = 0;
    int minutes = 0;
    int seconds = 0;

    static TimePart parse(String in) {
        if (in != null) {
            String[] arr = in.split(":");
            TimePart tp = new TimePart();
            tp.days = ((arr.length >= 1) ? Integer.parseInt(arr[0]) : 0);
            tp.hours = ((arr.length >= 2) ? Integer.parseInt(arr[1]) : 0);
            tp.minutes = ((arr.length >= 3) ? Integer.parseInt(arr[2]) : 0);
            tp.seconds = ((arr.length >= 4) ? Integer.parseInt(arr[3]) : 0);
            return tp;
        }
        return null;
    }

    public TimePart add(TimePart a) {
        this.seconds += a.seconds;
        int of = 0;
        while (this.seconds >= 60) {
            of++;
            this.seconds -= 60;
        }
        this.minutes += a.minutes + of;
        of = 0;
        while (this.minutes >= 60) {
            of++;
            this.minutes -= 60;
        }
        this.hours += a.hours + of;
        of = 0;
        while (this.hours >= 24) {
            of++;
            this.hours -= 24;
        }
        this.days += a.days + of;
        return this;
    }

    @Override
    public String toString() {
        return String.format("%02d:%02d:%02d:%02d", days, hours, minutes,
                seconds);
    }
}

然后你的测试用例就像

public static void main(String[] args) {
    try {
        TimePart d1 = TimePart.parse("00:1:9:14");
        TimePart d2 = TimePart.parse("00:3:10:4");
        TimePart d3 = TimePart.parse("00:3:39:49");
        System.out.println(d1);
        System.out.println(d2);
        System.out.println(d3);
        TimePart d4 = d1.add(d2).add(d3);
        System.out.println(d4);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

它似乎正确地执行了加法，就像

00:01:09:14
00:03:10:04
00:03:39:49
00:07:59:07