JTextField time in HH:mm:ss

java swing time formatting jformattedtextfield
davidahines picture davidahines · May 6, 2011 · Viewed 12.6k times · Source

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?

Answer

Anthony Accioly picture Anthony Accioly · May 6, 2011

For a float < 1440 you can get around with Calendar and 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.

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