public void getAllRaceID(Callback<List<String>> callback) throws NullPointerException {
		gw2API.getAllRaceIDs().enqueue(callback);
	}
public void getAllRaceID ( Callback < List < String > > callback ) throws NullPointerException { gw2API . getAllRaceIDs ( ) . enqueue ( callback ) ; }
For more info on races API go <a href="https://wiki.guildwars2.com/wiki/API:2/races">here</a><br/>
Give user the access to {@link Callback#onResponse(Call, Response)} and {@link Callback#onFailure(Call, Throwable)} methods for custom interactions

@param callback callback that is going to be used for {@link Call#enqueue(Callback)}
@throws NullPointerException if given {@link Callback} is empty
@see Race race info