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  1. #1
    salmontres is offline Member
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    Dec 2011
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    Default Basics on collections

    Hi guys,

    I'm trying to think of the most intelligent way to do the following: I want to write a class that contains a collection Cache of objects of type Member. The Member class is nested within the Cache class. Different classes should be able to call the Cache, but I want to maintain a single static set of the elements going into the Cache. A few questions arise in this case:

    1. How do I declare the set to be used within the Cache? (Right now, when declaring global field for my class, I have
    private static LinkedList<CacheMember> mru_list = null; as a global field for the Cache class, but does this mean that every time the Cache class is called, my static list is getting reset to null? How can I avoid this? (I tried simply writing
    private static LinkedList<CacheMember> mru_list; at the declaration of my global field, but the problem is that I heard it was bad practice to leave a field uninitialized, so I wanted to avoid doing this...))

    2. Is the Cache class begging to implement the Collection interface? (This isnít a school project, Iím simply trying to become a better programmer, so Iíd like to follow good logical form.)

    Any feedback would be greatly appreciated!

  2. #2
    JosAH's Avatar
    JosAH is offline Moderator
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    Sep 2008
    Voorschoten, the Netherlands
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    Default Re: Basics on collections

    A static member is only initialized once (when the class has just been loaded), so you can do this:

    Java Code:
    public class Cache {
       private static LinkedList<Member> mruList= new LinkedList<MemberL>();
    The LinkList class already implements the Collection interface because the List interface extends the Collection interface.

    kind regards,

    Build a wall around Donald Trump; I'll pay for it.

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