public class Cell
{
    public Cell ()
    {
    }
}
@@ -10,43 +10,338 @@
 ass 
-Cell%0A%7B%0A    public Cell ()%0A    %7B%0A    %7D
+Tile%0A%7B%0A    public Tile (char type)%0A    %7B%0A        _type = type;%0A    %7D%0A%0A    public char type ()%0A    %7B%0A        return _type;%0A    %7D%0A    %0A    public boolean isBug ()%0A    %7B%0A        return TileId.BUG == _type;%0A    %7D%0A%0A    @Override%0A    public String toString ()%0A    %7B%0A        return Character.toString(_type);%0A    %7D%0A%0A    private char _type;
 %0A%7D

Update Cell.java