Find the largest number in an array and a list in java 8?

There are multiple ways to find the largest number in an array and a list in Java 8.

Using IntStream.of() method:-

  • IntStream.of(int… values) returns a sequential IntStream containing the specified int values.
  • syntax:-     static IntStream of(int… values)
  • Here we call IntStream.of() method to pass array as input data.
  • After that, we call the max() method to find the maximum element.
  • Now it return max element inside optionalInt variable i.
  • The IntStream.of() method returns an IntStream, and the max() method returns an OptionalInt.

Using Stream.max() method :-

  • Stream.max() method allows to get maximum value from the processing Stream elements.Here we pass Comparator as an argument type.
  • Inside Integer::compare Comparators as method-reference comparing the each element.
  • The Stream.max() method returns an Optional<T> containing the maximum element of the stream according to the provided comparator.
  • 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.getAsInt());

		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 :- 78
largest number from Stream.max() method in list:- 87

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