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()
