How to force max to return ALL maximum values in a Java Stream?

Question

I\'ve tested a bit the max function on Java 8 lambdas and streams, and it seems that in case max is executed, even if more than one object compares

Answer 1

I would group by value and store the values into a TreeMap in order to have my values sorted, then I would get the max value by getting the last entry as next:

Stream.of(1, 3, 5, 3, 2, 3, 5)
    .collect(groupingBy(Function.identity(), TreeMap::new, toList()))
    .lastEntry()
    .getValue()
    .forEach(System.out::println);

Output:

5
5