Java Stream findAny() with examples

Stream findAny() returns an Optional (a container object which may or may not contain a non-null value) describing some element of the stream, or an empty Optional if the stream is empty.

Syntax of findAny()

Optional<T> findAny()

Parameters

1. Optional is a container object which may or may not contain a non-null value and
2. T is the type of object and the function

Returns an Optional describing some element of this stream, or an empty Optional if the stream is empty.

Exception : If the element selected is null,

NullPointerException is thrown.

Note: findAny() is a terminal-short-circuiting operation of Stream interface. This method returns any first element satisfying the intermediate operations. This is a short-circuit operation because it just needs ‘any’ first element to be returned and terminate the rest of the iteration.

Examples of Java Stream findAny()

Example 1: findAny() method on Integer Stream.

Java

// Java code for Stream findAny()
// which returns an Optional describing
// some element of the stream, or an
// empty Optional if the stream is empty.
import java.util.*;

class GFG {
    // Driver code
    public static void main(String[] args)
    {
        // Creating a List of Integers
        List<Integer> list = Arrays.asList(2, 4, 6, 8, 10);

        // Using Stream findAny() to return
        // an Optional describing some element
        // of the stream
        Optional<Integer> answer = list.stream().findAny();

        // if the stream is empty, an empty
        // Optional is returned.
        if (answer.isPresent()) {
            System.out.println(answer.get());
        }
        else {
            System.out.println("no value");
        }
    }
}