Java 8 stream - cast list items to type of subclass

Question

I have a list of ScheduleContainer objects and in the stream each element should be casted to type ScheduleIntervalContainer. Is there a way of doing t

Answer 1

Do you mean you want to cast each element?

scheduleIntervalContainersReducedOfSameTimes.stream()
                                            .map(sic -> (ScheduleIntervalContainer) sic)
                // now I have a Stream

Or you could use a method reference if you feel it is clearer

                                            .map(ScheduleIntervalContainer.class::cast)

On a performance note; the first example is a non-capturing lambda so it doesn't create any garbage, but the second example is a capturing lambda so could create an object each time it is classed.