/**
 * Cell information for the Map.
 */

public class CellId
{
    public static final char ENTRANCE = '@';
    public static final char OPEN_PASSAGE = '.';
    public static final char STONE_WALL = '#';
    
    public static final int DOOR_CODE = 32; // a-A

    private CellId ()
    {
    }
}
/**
 * Cell information for the Map.
 */

public class CellId
{
    public static final char ENTRANCE = '@';
    public static final char OPEN_PASSAGE = '.';
    public static final char STONE_WALL = '#';

    private CellId ()
    {
    }
}
Remove unneeded code.