Available on jvm
staticempty():OptionalLong
staticof(param1:Int64):OptionalLong
equals(param1:Dynamic):Bool
getAsLong():Int64
hashCode():Int
ifPresent(param1:LongConsumer):Void
isPresent():Bool
orElse(param1:Int64):Int64
orElseGet(param1:LongSupplier):Int64
orElseThrow<X>(param1:Supplier<X>):Int64
toString():String