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Showing content from https://www.geeksforgeeks.org/java/optional-of-method-in-java-with-examples/ below:

Optional of() method in Java with examples

Last Updated : 12 Jul, 2025

The

of()

method of

java.util.Optional class

in Java is used to get an instance of this Optional class with the specified value of the specified type.

Syntax:

public static <T> 
  Optional<T> of(T value)

Parameters:

This method accepts

value

as parameter of type T to create an Optional instance with this value.

Return value:

This method returns an instance of this

Optional class

with the specified value of the specified type.

Exception:

This method throws

NullPointerException

if the specified value is null. Below programs illustrate of() method:

Program 1: Java


 // Java program to demonstrate
// Optional.of() 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);
    }
}

Output:

Optional: Optional[9455]

Program 2: Java


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

import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        try {
            // create a Optional
            Optional<Integer> op
                = Optional.of(null);

            // print value
            System.out.println("Optional: "
                               + op);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output:

java.lang.NullPointerException

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/Optional.html#of-T-

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