I'm programming a game in java which is made up of a grid of tiles. I wan't to be able to inuitively define the edges of the tiles and how they relate to each other, e.g. to get the opposite edge of a tile, I want to be able to just type TOP.opposite()
. However, when using enums to define these edges I end up having to forward reference at least two of them in the contstructor:
public enum Edge {
TOP(Edge.BOTTOM), //illegal forward reference
BOTTOM(Edge.TOP),
LEFT(Edge.RIGHT), //illegal forward reference
RIGHT(Edge.LEFT);
private Edge opposite;
private Edge(Edge opp){
this.opposite = opp;
}
public Edge opposite(){
return this.opposite;
}
}
Is there any way of getting round this problem using enums which is just as simple?
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