java JTextField 时间以 HH:mm:ss 表示
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JTextField time in HH:mm:ss
提问by davidahines
I have the estimated time the it would take for a particular task in minutes in a float. How can I put this in a JFormattedTextField in the format of HH:mm:ss?
我在浮动中以分钟为单位估计了特定任务所需的时间。我怎样才能把它放在一个 JFormattedTextField 的格式中HH:mm:ss？
回答by Anthony Accioly
For a float < 1440 you can get around with Calendarand DateFormat.
对于 float < 1440，您可以使用Calendar和DateFormat。
float minutes = 100.5f; // 1:40:30
Calendar c = Calendar.getInstance();
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
c.add(Calendar.MINUTE, (int) minutes);
c.add(Calendar.SECOND, (int) ((minutes % (int) minutes) * 60));
final Date date = c.getTime();
Format timeFormat = new SimpleDateFormat("HH:mm:ss");
JFormattedTextField input = new JFormattedTextField(timeFormat);
input.setValue(date);
But be warned that if your float is greater than or equal to 1440 (24 hours) the Calendar method will just forward a day and you will not get the expected results.
但请注意，如果您的浮动时间大于或等于 1440（24 小时），则 Calendar 方法只会向前推一天，您将无法获得预期的结果。
回答by no.good.at.coding
JFormattedTextFieldaccepts a Formatobject - you could thus pass a DateFormatthat you get by calling DateFormat#getTimeInstance(). You might also use a SimpleDateFormatwith HH:mm:ssas the format string.
JFormattedTextField接受一个Format对象 - 因此DateFormat您可以通过调用DateFormat#getTimeInstance(). 您还可以使用SimpleDateFormatwithHH:mm:ss作为格式字符串。
See also: http://download.oracle.com/javase/tutorial/uiswing/components/formattedtextfield.html#format
另见：http: //download.oracle.com/javase/tutorial/uiswing/components/formattedtextfield.html#format
If you're not restricted to using a JFormattedTextField, you might also consider doing your own formatting using the TimeUnitclass, available since Java 1.5, as shown in this answer: How to convert Milliseconds to "X mins, x seconds" in Java?
如果您不限于使用 a JFormattedTextField，您还可以考虑使用TimeUnit自 Java 1.5 起可用的类进行自己的格式化，如以下答案所示：How to convert Milliseconds to "X mins, x seconds" in Java?
