OptionalDouble help us to create an object which may or may not contain a Double value. The orElseThrow() method help us to get the double value. If double value is not present then this method will throw NoSuchElementException. Syntax:
public Double orElseThrow()
Parameters: This method accepts nothing. Return value: This method returns the Double value described by this OptionalDouble. Exception: This method throws NoSuchElementException if no value is present Below programs illustrate orElseThrow() method: Program 1:
Java
// Java program to demonstrate// OptionalDouble.orElseThrow() methodimport java.util.OptionalDouble;public class GFG { public static void main(String[] args) { // create a OptionalDouble OptionalDouble opDouble = OptionalDouble.of(134.1); // get value using orElseThrow() System.out.println("double Value extracted using" + " orElseThrow() = " + opDouble.orElseThrow()); }} |
Output:
double Value extracted using orElseThrow() = 134.1
Program 2:
Java
// Java program to demonstrate// OptionalDouble.orElseThrow() methodimport java.util.OptionalDouble;public class GFG { public static void main(String[] args) { // create a OptionalDouble OptionalDouble opDouble = OptionalDouble.empty(); try { // try to get value from empty OptionalDouble Double value = opDouble.orElseThrow(); } catch (Exception e) { System.out.println("Exception thrown : " + e); } }} |
Output:
Exception thrown : java.util.NoSuchElementException: No value present
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#orElseThrow()
