How can I handle a time interval ?

I have an application in which the users will enter the time spent on specific activities. The time spent will be in hours and minutes(eg. 8.00, 2.30, 4.50 ). Which is the best approach in Java to represent this time interval and to perform basic operations like sum?
I have looked into the API but The classes I have found (Date, Time, Calendar) all refer to instant of time not to interval of time.
Thanks for your help.
Federico.

Parse the times into Date objects, (Using DateFormat.getTimeInstance etc.).
Date stores the time in milliseconds since 1970. So you just have to subtract.
final static DateFormat timeFormat = DateFormat.getTimeInstance();
Date startTime = timeFormat.parse(strStart);
Date endTime = timeFormat.parse(strEnd);
long gapMillis = endTime.getTime() - startTime.getTime();You may want to check that endtime is after starttime and, if not, add a day using Calendar.

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