OptionalLong help us to create an object which may or may not contain a Long value. The orElseThrow() method help us to get the value and if value is not present then this method will throw NoSuchElementException. Syntax:
public Long orElseThrow()
Parameters: This method accepts nothing. Return value: This method returns the Long value described by this OptionalLong. Exception: This method throws NoSuchElementException if no value is present Below programs illustrate orElseThrow() method: Program 1:
Java
// Java program to demonstrate// OptionalLong.orElseThrow() methodimport java.util.OptionalLong;public class GFG { public static void main(String[] args) { // create a OptionalLong OptionalLong opLong = OptionalLong.of(45213246); // get value using orElseThrow() System.out.println("Value extracted using" + " orElseThrow() = " + opLong.orElseThrow()); }} |
Output:
Value extracted using orElseThrow() = 45213246
Program 2:
Java
// Java program to demonstrate// OptionalLong.orElseThrow() methodimport java.util.OptionalLong;public class GFG { public static void main(String[] args) { // create a OptionalLong OptionalLong opLong = OptionalLong.empty(); try { // try to get value from empty OptionalLong long value = opLong.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/OptionalLong.html#orElseThrow()
