Java – find the next occurrence of the day of the week in jsr-310

Given a jsr-310 object, such as localdate, how can I find the date of the next Wednesday (or any other day of the week)?

LocalDate today = LocalDate.Now();
LocalDate nextWed = ???

Solution

The answer depends on your definition of "next Wednesday; -)

JSR - 310 provides two options for using the temporaladjusters class

The first option is next ():

LocalDate input = LocalDate.Now();
LocalDate nextWed = input.with(TemporalAdjusters.next(DayOfWeek.WEDNESDAY));

The second option is nextorsame():

LocalDate input = LocalDate.Now();
LocalDate nextWed = input.with(TemporalAdjusters.nextOrSame(DayOfWeek.WEDNESDAY));

The two are different according to the day of the week of the input date

If the input date is January 22, 2014 (Wednesday), then:

>Next () will return to 2014-01-29 in a week > nextorsame () will return to 2014-01-22, the same as the input

If the input date is January 20, 2014 (Monday), then:

>Next() will return to 2014-01-22 > nextorsame() will return to 2014-01-22

Namely Next () always returns a later date, while nextorsame () returns the input date if it matches

Note that both options look better than static import:

LocalDate nextWed1 = input.with(next(WEDNESDAY));
LocalDate nextWed2 = input.with(nextOrSame(WEDNESDAY));

Temporaladjusters also includes matching previous () and previousorsame () methods