OptionalLong orElseThrow(Supplier) method in Java with examples

The orElseThrow(Supplier) method of OptionalLong class is used to get the long value contained by OptionalLong. 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:

public <X extends Throwable> long 
    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:

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// Java program to demonstrate
// OptionalLong.orElseThrow(Supplier) method
  
import java.util.OptionalLong;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalLong
        OptionalLong opLong = OptionalLong.of(894763545123L);
  
        // apply orElseThrow(Supplier)
        long value = opLong.orElseThrow(ArithmeticException::new);
  
        System.out.println("value " + value);
    }
}

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Output:

Program 2:

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// Java program to demonstrate
// OptionalLong.orElseThrow(Supplier) method
  
import java.io.IOException;
import java.util.OptionalLong;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalLong
        OptionalLong opLong = OptionalLong.empty();
  
        // apply orElseThrow(Supplier)
        Long value;
  
        try {
  
            value = opLong.orElseThrow(ArithmeticException::new);
        }
        catch (ArithmeticException e) {
            // TODO Auto-generated catch block
            System.out.println("Exception " + e);
        }
    }
}

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Output:

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



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