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

As your ArrayList contains Forecast objects you'll need to define how the max method should find the maximum element within your ArrayList.

something along the lines of this should work:

ArrayList forecasts = new ArrayList<>();
// Forecast object which has highest temperature
Forecast element = Collections.max(forecasts, Comparator.comparingInt(Forecast::getTemperature));
// retrieve the maximum temperature
int maxTemperature = element.getTemperature();