How to find the max element from an array list of objects?

Question

Collections.max(arraylist) doesn\'t work, and a regular for loop won\'t work either.

What I have is:

ArrayList

        

Answer 1

Another solution is use map reduce:

Optional element = forecasts
                     .stream()
                     .reduce((a,b) -> a.getTemperature() > b.getTemperature() ? a : b );

In this way you could even use use parallelStream()