Optional toString() method in Java with examples

The toString() method of java.util.Optional class in Java is used to get the string representation of this Optional instance.

Syntax:

public String toString()

Parameters: This method accepts nothing.

Return value: This method returns the string representation of this Optional instance.

Below programs illustrate toString() method:
Program 1:

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

import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        // create a Optional
        Optional<Integer> op
            = Optional.of(452146);

        // get value using toString
        String value = op.toString();

        // print value
        System.out.println("String Representation: "
                           + value);
    }
}

Output:

String Representation: Optional[452146]

Program 2:

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

import java.util.Optional;

public class GFG {

    public static void main(String[] args)
    {

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

        // get value using toString
        String value = op.toString();

        // print value
        System.out.println("String Representation: "
                           + value);
    }
}

Output:

String Representation: Optional.empty

References: https://docs.oracle.com/javase/9/docs/api/java/util/Optional.html#toString–