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    <p>If you work with arrays the neighbors of an example cell a[1][1] can be a[0][1], a[2][1], a[1][0] and a[1][2] if you only work in 4 directions.</p> <p>You can also create a class for the cells, which knows its direct neighbor cells, so you can get the left neighbor like cell.getLeftNeighbor().</p> <p><strong>Edit:</strong></p> <p>Ok, so now that you have your code so far we can help a bit more specific. :)</p> <p>The way you implemented it, you would have to access the disease logic in your class PlayingArea. I do not quite understand what your methods in the class Disease do, forTwo() will assign 'E' or 'F' to the char D for example.</p> <p>You need to determine on which coordinates the disease is, you can do it on different ways:</p> <ul> <li><p>Specify the coordinates in PlayingArea, like 5 and 4 = grid[5][4].The direct neighbors are now grid[x-1][x], grid[x+1][x], grid[x][x-1] and grid[x][x+1].</p></li> <li><p>Replace the char[][] with a Cell[][]. You would have to create a class Cell, which only needs to know with a boolean, which letter is in it and if it is diseased. Additionally you can give it other Cells as attributes, this way you can access a cells neighbors directly.</p> <pre><code>public class Cell{ public char letter; public boolean diseased; public Cell leftCell, rightCell, topCell, bottomCell; public Cell(char newLetter){ letter = newLetter; } } </code></pre> <p>This example is without setter/getter methods, you can create cells in the PlayingArea, set the state of disease of each cell and assign/access neighbor cells.</p></li> </ul>
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