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.
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: