Find Largest number in an array and list in java 8?

There are following way to Find largest number in an array and list in java 8.

Using IntStream.of() method:-

IntStream.of(int value) returns a sequential ordered stream data whose elements are the specified values.
syntax:- static IntStream of(int… values)
Here we call IntStream.of() method to pass array as input data.
After that call max method to describing the maximum element of this stream.
Now it return max element inside optionalInt variable i.
Return type of IntStream of() method is optionalInt.

Using Stream.max() method :-

Stream.max() method allows to get maximum value from the processing Stream elements.here we pass java.util.Comparator as argument type.
Inside Integer::compare Comparators as method-reference comparing the each element.
Stream.max() method returns type is Optional<T>
From get() method of Optional<T> we can find maximum number from the List .
Now print the largest number value.

				
					import java.util.Arrays;
import java.util.List;
import java.util.OptionalInt;
import java.util.stream.IntStream;

public class AS {
	public static void main(String[] args) {
		
		int arr[] = { 12,34,56,78,32,67 };
		List<Integer> list = Arrays.asList(32,56,87,45,12);

		OptionalInt i = IntStream.of(arr).max();
		System.out.println("largest number from IntStream.of() method in array :- " + i);

		Integer l = list.stream().max(Integer::compare).get();
		System.out.println("largest number from Stream.max() method in list:- " + l);
	}
}

Output :-
largest number from IntStream.of() method in array :- OptionalInt[78]
largest number from Stream.max() method in list:- 87