OptionalLong orElseThrow() method in Java with examples

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 NoSuchElemenrException.

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:

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// Java program to demonstrate
// OptionalLong.orElseThrow() method
import 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());
    }
}

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Output:

Value extracted using orElseThrow() = 45213246

Program 2:

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// Java program to demonstrate
// OptionalLong.orElseThrow() method
  
import 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);
        }
    }
}

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Output:

Exception thrown : java.util.NoSuchElementException: No value present

References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalLong.html#orElseThrow()



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