Question

There is an ArrayList which stores integer values. I need to find the maximum value in this list. E.g. suppose the arrayList stored values are : 10, 20, 30, 40, 50 and the max
value would be 50.

What is the efficient way to find the maximum value?

@Edit : I just found one solution for which I am not very sure

ArrayList<Integer> arrayList = new ArrayList<Integer>();
arrayList.add(100); /* add(200), add(250) add(350) add(150) add(450)*/

Integer i = Collections.max(arrayList)

and this returns the highest value.

Another way to compare the each value e.g. selection sort or binary sort algorithm
 

Answer 1

You can use the Collections API to achieve what you want easily – read efficiently – enough
Javadoc for Collections.max

Collections.max(arrayList);

Returns the maximum element of the given collection, according to the natural ordering of its elements. All elements in the collection must implement the Comparable interface.