Using Java 8 stream methods to get a max value

Question

I would like to get the max value out of a list using java 8 stream methods.

The structure is the following:

• I read a csv file and store the data of every

Answer 1

using reduce

int max1 = arrRound.stream()
        .flatMap(r -> r.getHits().stream())
        .mapToInt(h -> h.getPrizeAmount())
        .reduce(Math::max) //returns OptionalInt
        .orElse(Integer.MIN_VALUE);

or

int max2 = arrRound.stream()
        .flatMap(r -> r.getHits().stream())
        .mapToInt(h -> h.getPrizeAmount())
        .reduce(Integer.MIN_VALUE, Math::max);