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()
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