Finding Max with Lambda Expression in Java

Question

This is my code

    List ints = Stream.of(1,2,4,3,5).collect(Collectors.toList());
    Integer maxInt = ints.stream()
                                 


        

Answer 1

This function (note -> is for closures and not to be confused with => which is for comparison)

i -> i

just means you need to compare the entire object as it is. i.e. if I have an i you need to compare i

A less trivial example might be

max(Comparator.comparing(i -> -i))

which will give you the minimum or

max(Comparator.comparing(i -> Math.abs(100-i))

gives you a value which is farthest from 100.

max(Comparator.comparing(i -> i.toString()))

which will give you the maximum comparing as a String i.e. "9" > "10" as a string.