OptionalDouble orElseThrow() method in Java with examples

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 NoSuchElemenrException.

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:

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

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Output:

double Value extracted using orElseThrow() = 134.1

Program 2:

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

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Output:

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

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

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