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());
}
} |
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);
}
}
} |
OptionalDouble: OptionalDouble.empty Exception: java.util.NoSuchElementException: No value present
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#getAsDouble()