How to use streams collect method to accumulate periods concatenating if overlapps.
List<Period> periodList = ...
List<Period> concatenatedPeriods =
periodList.stream()
.collect(PeriodList::new, PeriodList::add, PeriodList::combain)
.get(); Input:
Period{start=1, end=2}
Period{start=3, end=7}
Period{start=3, end=4}
Period{start=5, end=6}
Period{start=4, end=7}
Period{start=8, end=9}
Output:
Period{start=1, end=2}
Period{start=3, end=7}
Period{start=8, end=9}