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java - Adding enum type to a list

If I need to add an enum attribute to a list, how do I declare the list? Let us say the enum class is:

public enum Country{ USA, CANADA; }

I want to do:

List<String> l = new ArrayList<>();
l.add(Country.USA);

What needs to be used instead of List<String>?

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Should be:

List<Country> l = new ArrayList<Country>();
l.add(Country.USA); // That one's for you Code Monkey :)

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