Is it bad practice to use an Enum's ordinal value to index an array in Java?

Question

I have two arrays: Walls and Neighbors.

public boolean[] walls = new boolean[4];
public Cell[] neighbors = new Cell[4];

and I have an Enum:

Answer 1

Using an enum's ordinal for your use depends on implicit order. I like to be explicit especially if you use the integer values as index into your array linking value to meaning.

In this case I would therefore opt to use final static int NORTH = 0, etc.