Java 8 - add property of object to list [duplicate]

Question

I have an empty list of integers:

final List<Integer> reservedMarkers = new ArrayList<>();

and I will fill this list with the marker property of a list of objects, such like this:

scheduleIntervalContainers.stream().forEach(s -> s.getMarker(), reservedMarkers.add(s));

My final target would be to get the highest marker number but actually I dont know a better way as getting all marker numbers, than sort it and than get the highest one.

this does not work for sure, is there a possibility to do this in this way?

There are other methods than forEach. And there is a documented API. Look there first. — Holger
– Holger, Commented Jul 4, 2016 at 11:19

Sergii Lagutin · Accepted Answer · 2016-07-04 11:09:19Z

1

Use IntStream to find max value:

OptionalInt max = scheduleIntervalContainers.stream()
    .mapToInt(s -> s.getMarker())
    .max();

answered Jul 4, 2016 at 11:09

Sergii Lagutin

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