OptionalDouble toString() method in Java with examples

The toString() method help us to get a non-empty string representation of this OptionalDouble.This non-empty string representation is suitable for debugging. The exact presentation format is unspecified and may vary between implementations and versions.

Syntax:

public String toString()

Parameters: This method accepts nothing.

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

Below programs illustrate toString() method:
Program 1:

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

import java.util.OptionalDouble;

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalDouble
        OptionalDouble opDouble
            = OptionalDouble.of(.3203);

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

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

Output:

Value: OptionalDouble[0.3203]

Program 2:

// Java program to demonstrate
// OptionalDouble.toString() method
import java.util.OptionalDouble;

public class GFG {

    public static void main(String[] args)
    {

        // create a empty OptionalDouble
        OptionalDouble opDouble
            = OptionalDouble.empty();

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

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

Output:

Value: OptionalDouble.empty

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