Check instanceof in stream

Question

I have the following expression:

scheduleIntervalContainers.stream()
        .filter(sic -> ((ScheduleIntervalContainer) sic).getStartTime() != ((ScheduleInte         


        

Answer 1

A pretty elegant option is to use method reference of class:

scheduleIntervalContainers
  .stream()
  .filter( ScheduleIntervalContainer.class::isInstance )
  .map( ScheduleIntervalContainer.class::cast )
  .filter( sic -> sic.getStartTime() != sic.getEndTime())
  .collect(Collectors.toList() );