Card.CLUBS is most likely a static final of a data type. I say a data type and don't give a specific type because without the signature of Card's constructor or the source/compiled class for Card, you have no way of knowing what exactly it is. Here is an example of it as an integer.

public class Card
{
   public static final int CLUBS = 1;
}

Looks like an enum to me.

public enum Card
{
    CLUB, SPADE, HEART, DIAMOND
}

If you have to do that sort of stuff use Java enums, that's why they're for. Integer enumerations are annoying and unsafe to use (ie, if its an integer you could do new Card(-128, 4), if its a true enum it wouldn't compile).

It's most definitely not an enum. The class being instantiated is Cards and it's passing Cards.CLUBS with no namespace. Try the following:

public enum Cards
{
   CLUBS
}

public class Cards
{
}

This will not compile because they are in the same package and have the same name. Without a namespace on the Cards enum being passed into the Cards constructor, it will not compile.

Now that I'm thinking... If that is exactly the line of code, it can't be an enum, you can't instantiate a new enum object. They get initialized only once in Java, constructor is private.

Now if it's something like new Card (Cards.CLUB, 4) that would be an enum.

In any case my recommendation still stands, use enums instead of integer statics for that sort of thing (ie categorization).

EDIT: Sort of ninja'd, through not for the same reasons :D

Now that I'm thinking... If that is exactly the line of code, it can't be an enum, you can't instantiate a new enum object. They get initialized only once in Java, constructor is private.

Now if it's something like new Card (Cards.CLUB, 4) that would be an enum.

In any case my recommendation still stands, use enums instead of integer statics for that sort of thing (ie categorization).

I agree with TheChubu, although your exact line of code tells me that it's definitely not an enum and my reply gave you what it most likely is, I would suggest using an enum instead.

public enum Cards
{
   CLUB
}

public class Card
{
   public Card(Cards cardType, int value) { }
}

//usage
Card card = new Card(Cards.CLUB, 4);

Take note though, it's better to use enums when making something in Java for a typical OS, like Linux or Windows but in some cases, like programming in Java for Android it's best to use the "static final int" as this provides better performance; at least last I heard.