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:Â
Java
// Java program to demonstrate// OptionalInt.orElseThrow() methodÂ
import java.util.OptionalInt;Â
public class GFG {Â
    public static void main(String[] args)    {Â
        // create a OptionalInt        OptionalInt opInt = OptionalInt.of(12345);Â
        // get value using orElseThrow()        System.out.println("int Value extracted using"                           + " orElseThrow() = "                           + opInt.orElseThrow());    }} |
Output:
int Value extracted using orElseThrow() = 12345
Program 2:Â
Java
// Java program to demonstrate// OptionalInt.orElseThrow() methodÂ
import java.util.OptionalInt;Â
public class GFG {Â
    public static void main(String[] args)    {Â
        // create a OptionalInt        OptionalInt opInt = OptionalInt.empty();Â
        try {Â
            // try to get value from empty OptionalInt            int value = opInt.orElseThrow();        }        catch (Exception e) {Â
            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()
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