Java格式小时和分钟 [英] Java format hour and min

问题描述

我需要格式化我的时间字符串，例如：

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。但我不知道如何追加小时和分钟。要求不使用任何库。

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.

如果您以前做过类似的事情，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

因为，它是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......

Which outputs...

2hrs 40mins

为什么要使用这样的东西？除了通常更好的API，当分钟等于 1600 ？

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

上述将显示 26小时40分钟，而不是打印 2小时40分钟。 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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