OptionalDouble getAsDouble() method in Java with examples

OptionalDouble help us to create an object which may or may not contain a double value. The getAsDouble() method returns value If a value is present in OptionalDouble object, otherwise throws NoSuchElementException.

Syntax:

public double getAsDouble()

Parameters: This method accepts nothing.

Return value: This method returns the value described by this OptionalDouble.

Exception: This method throws NoSuchElementException if no value is present

Below programs illustrate getAsDouble() method:

Program 1:

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

import java.util.OptionalDouble;

public class GFG {

    public static void main(String[] args)
    {

        // Create an OptionalDouble instance
        OptionalDouble opDouble
            = OptionalDouble.of(44356.455);

        System.out.println("OptionalDouble: "
                           + opDouble.toString());

        // Get value in this instance
        // using getAsDouble()
        System.out.println("Value in OptionalDouble = "
                           + opDouble.getAsDouble());
    }
}

Output:

OptionalDouble: OptionalDouble[44356.455]
Value in OptionalDouble = 44356.455

Program 2:

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

import java.util.OptionalDouble;

public class GFG {

    public static void main(String[] args)
    {

        try {

            // Create an OptionalDouble instance
            OptionalDouble opDouble = OptionalDouble.empty();

            System.out.println("OptionalDouble: "
                               + opDouble.toString());

            // Get value in this instance
            // using getAsDouble()
            System.out.println("Value in OptionalDouble = "
                               + opDouble.getAsDouble());
        }
        catch (Exception e) {

            System.out.println("Exception: " + e);
        }
    }
}

Output:

OptionalDouble: OptionalDouble.empty
Exception: java.util.NoSuchElementException: No value present

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