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:

// 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()); 
    } 
} 

Output:

double Value extracted using orElseThrow() = 134.1

Program 2:

// 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); 
        } 
    } 
} 

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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