How Make operation on time

Question

i have a string like this on my java code:

17:00

I want to make a subtraction using a constant integer

 public static final int MAX_DUREE_TRAVAIL_JOUR = 10;

When i do this:

Integer.parseInt("17:00") - ConstantesIntervention.MAX_DUREE_TRAVAIL_JOUR

I have this error:

java.lang.NumberFormatException: For input string: "17:00"

Thx.

You should use the `split` method of the `String` class to separate out the hours from the minutes, then parse each part separately. — Dawood ibn Kareem, Dec 04 '13 at 09:26

score 2 · Answer 1 · answered Dec 04 '13 at 09:27

What are you expecting to happen? 17:00 is not a valid string representation of an integer.

You probably want to use a SimpleDateFormat to parse the string as a Date and do the time arithmetic on that.

Alternatively, take a look at the JodaTime library which provides much better handling of dates/times.

score 1 · Answer 2 · answered Dec 04 '13 at 09:26

1

17:00 cant be to converted to an integer.

answered Dec 04 '13 at 09:26

4J41

score 0 · Answer 3 · edited May 23 '17 at 12:13

The answer by Ajai is correct.

Some advice: When working with dates and times, work with dates and times (not strings and integers). Meaning use date-time classes.

Use a good date-time library (not the mess that is java.util.Date/Calendar).

Use Joda-Time 2.3 now.
In the future, with Java 8, consider moving to JSR 310: Date and Time API which supplants the Date/Calendar classes and is inspired by Joda-Time.

P.S. Mercer, Joda-Time even knows how to speak français. See another answer of mine today for an example.

score 0 · Answer 4 · answered Dec 04 '13 at 09:30

0

Because 17:00 is not a Correct integer.You should divide the string and use Integer.parse() then according to your business logic use those integers.

answered Dec 04 '13 at 09:30

PrasadGeek

4 Answers4