Java 格式小时和分钟

Java format hour and min(Java 格式小时和分钟)

问题描述

我需要像这样格式化我的时间字符串:

I need to format my time string such as this:

int time = 160;

这是我的示例代码:

public static String formatDuration(String minute) {
    String formattedMinute = null;
    SimpleDateFormat sdf = new SimpleDateFormat("mm");
    try {
        Date dt = sdf.parse(minute);
        sdf = new SimpleDateFormat("HH mm");
        formattedMinute = sdf.format(dt);
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return formattedMinute;
//        int minutes = 120;
//        int h = minutes / 60 + Integer.parseInt(minute);
//        int m = minutes % 60 + Integer.parseInt(minute);
//        return h + "hr " + m + "mins";
}

我需要将其显示为 2 小时 40 分钟.但我不知道如何附加小时"和分钟".要求是不要使用任何库.

I need to display it as 2hrs 40mins. But I don't have a clue how to append the "hrs" and "mins". The requirement is not to use any library.

如果您过去做过类似的事情，请随时提供帮助.非常感谢！

If you've done something like this in the past, feel free to help out. Thanks a bunch!

推荐答案

既然是 2018 年，你真的应该使用 Java 8 中引入的日期/时间库

Since, it's 2018, you really should be making use of the Date/Time libraries introduced in Java 8

String minutes = "160";
Duration duration = Duration.ofMinutes(Long.parseLong(minutes));

long hours = duration.toHours();
long mins = duration.minusHours(hours).toMinutes();

// Or if you're lucky enough to be using Java 9+
//String formatted = String.format("%dhrs %02dmins", duration.toHours(), duration.toMinutesPart());
String formatted = String.format("%dhrs %02dmins", hours, mins);
System.out.println(formatted);

哪些输出...

2hrs 40mins

为什么要使用这样的东西?除了通常是更好的 API，当 minutes 等于 1600 时会发生什么?

Why use something like this? Apart of generally been a better API, what happens when minutes equals something like 1600?

上面将显示 26hrs 40mins，而不是打印 2hrs 40mins.SimpleDateFormat 格式化日期/时间值，它不处理持续时间

Instead of printing 2hrs 40mins, the above will display 26hrs 40mins. SimpleDateFormat formats date/time values, it doesn't deal with duration

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