OptionalInt stream() method in Java with examples

The stream() method help us to get value contain by OptionalInt as IntStream. If a value is present, method returns a sequential IntStream containing only that value, otherwise returns an empty IntStream.

Syntax:

public IntStream stream()

Parameters: This method accepts nothing.

Return value: This method returns the optional value as an IntStream.

Below programs illustrate stream() method:
Program 1:

// Java program to demonstrate
// OptionalInt.stream() method

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

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalInt
        OptionalInt opInt = OptionalInt.of(452146);

        // get value as stream
        IntStream out = opInt.stream();

        // print value
        System.out.println("Value:");
        out.forEach(System.out::println);
    }
}

Output:

Program 2:

// Java program to demonstrate
// OptionalInt.stream() method

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

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalInt
        OptionalInt opInt = OptionalInt.empty();

        // get value as stream
        IntStream out = opInt.stream();

        // print value
        if (out.count() == 0)
            System.out.println("opInt is empty");
    }
}

Output:

References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalInt.html#empty()