question: default void forEachRemaining ( LongConsumer action ) { Objects . requireNonNull ( action ) ; while ( hasNext ( ) ) action . accept ( nextLong ( ) ) ; }
target:  Performs the given action for each remaining element until all elements have been processed or the action throws an exception.  Actions are performed in the order of iteration, if that order is specified. Exceptions thrown by the action are relayed to the caller.