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Optional stream() method in Java with examples

Last Updated : 12 Jul, 2025

The

method of

in Java is used to get the sequential stream of the only value present in this Optional instance. If there is no value present in this Optional instance, then this method returns returns an empty Stream.

public Stream<T> stream()

This method do not accept any parameter.

This method returns the sequential stream of the only value present in this Optional instance. If there is no value present in this Optional instance, then this method returns an empty Stream. Below programs illustrate stream() method:

Below programs require JDK 9 and above to execute.

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

import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        // create a Optional
        Optional<Integer> op
            = Optional.of(9455);

        // print value
        System.out.println("Optional: "
                           + op);

        // get the Stream
        System.out.println("Getting the Stream:");
        op.stream().forEach(System.out::println);
    }
}

Optional: Optional[9455]
Getting the Stream:
9455

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

import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        // create a Optional
        Optional<Integer> op
            = Optional.empty();

        // print value
        System.out.println("Optional: "
                           + op);

        try {

            // get the Stream
            System.out.println("Getting the Stream:");
            op.stream().forEach(System.out::println);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Optional: Optional.empty
Getting the Stream:

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