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OptionalDouble orElseThrow(Supplier) method in Java with examples

  • Last Updated : 27 May, 2019

The orElseThrow(Supplier) method of OptionalDouble class used to get the value contained by OptionalDouble. If a value is present, this method returns the value, otherwise, this method throws an exception produced by the exception supplying function. The exception Supplier function is passed as a parameter.

Syntax:

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public <X extends Throwable> double 
    orElseThrow(Supplier<X> exceptionSupplier)
        throws X extends Throwable

Parameters: This method accepts one parameter exceptionSupplier which is the supplying function that produces an exception to be thrown.

Return value: This method returns the value, if present.



Exception: This method throw following Exceptions:

  • X – if no value is present.
  • NullPointerException – if no value is present and the exception supplying function is null
  • X extends Throwable

Below programs illustrate orElseThrow(Supplier) method:
Program 1:




// Java program to demonstrate
// OptionalDouble.orElseThrow(Supplier) method
  
import java.util.OptionalDouble;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalDouble
        OptionalDouble opDouble
            = OptionalDouble.of(0.268924);
  
        // apply orElseThrow(Supplier)
        double value
            = opDouble.orElseThrow(ArithmeticException::new);
  
        System.out.println("value " + value);
    }
}

Output:

Program 2:




// Java program to demonstrate
// OptionalDouble.orElseThrow(Supplier) method
import java.io.IOException;
import java.util.OptionalDouble;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalDouble
        OptionalDouble opDouble
            = OptionalDouble.empty();
  
        // apply orElseThrow(Supplier)
        double value;
  
        try {
  
            value = opDouble.orElseThrow(IOException::new);
        }
        catch (IOException e) {
  
            System.out.println("Exception " + e);
        }
    }
}

Output:

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




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