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Thread: Cross-Class Implementation

  1. #1
    Join Date
    Aug 2012
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    Default Cross-Class Implementation

    So, I have a situation where I have a set of abstract classes that have to interact with themselves and eachother, but only within a certain implementation. This results in a situation where I have something that looks like:

    Java Code:
    public interface Map
         public Location getNearest(Location l);
    Which I can implement with something that looks like:
    Java Code:
    public class 2DMap implements Map
         public Location getNearest(Location l)
               //actual code goes here
    Or something that looks like:
    Java Code:
    public class 2DMap implements Map
        public 2DLocation getNearest(2DLocation l){
              //actual code goes here
    In the first option, the 2DMap would be expected to handle Locations from other implementations- something from a 3D map or a hex grid, which it clearly could not do. The second option, however, does not compile, because it doesn't really fufill the method header.

    This is something I could fix easily enough with casting- within each method cast the relevant types to what they need to be- but it feels like there should be a more elegant, OOP-friendly way do to so.

    What would be the "correct" way to go about this? Mind, not just looking for specific answers to the example listed, but for this type of situation in general- abstract systems where the specific implementations work in the described way, but only within the implementation.

  2. #2
    Tolls is offline Moderator
    Join Date
    Apr 2009
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    Default Re: Cross-Class Implementation

    Map<T extends Location>?
    (Note syntax is suspect as I rarely write these things).
    quad64bit likes this.
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