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");
}
}
}
