OptionalInt orElseThrow() method in Java with examples

OptionalInt help us to create an object which may or may not contain a Int value. The orElseThrow() method help us to get the int value and if int value is not present then this method will throw NoSuchElementException. Syntax:

public Int orElseThrow()

Parameters: This method accepts nothing. Return value: This method returns the Int value described by this OptionalInt. Exception: This method throws NoSuchElementException if no value is present Below programs illustrate orElseThrow() method: Program 1:

Java

// Java program to demonstrate
// OptionalInt.orElseThrow() method

import java.util.OptionalInt;

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalInt
        OptionalInt opInt = OptionalInt.of(12345);

        // get value using orElseThrow()
        System.out.println("int Value extracted using"
                           + " orElseThrow() = "
                           + opInt.orElseThrow());
    }
}

Output:

int Value extracted using orElseThrow() = 12345

Program 2:

Java

// Java program to demonstrate
// OptionalInt.orElseThrow() method

import java.util.OptionalInt;

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalInt
        OptionalInt opInt = OptionalInt.empty();

        try {

            // try to get value from empty OptionalInt
            int value = opInt.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/OptionalInt.html#orElseThrow()