Question

I am writing a program where I have a 2D array of objects from a cell class, and I need to write a method where I pass a cell object as a parameter and I return an arraylist of cells that surround the cell(N, S, E, W). Each cell is given a location from the Point class. What I am having trouble with is how to use the locations that I know(x, y-1 is north) to produce a cell. Any help on this is appreciated. Thank you.

Answer 1

If (x,y) is your cell then the four surrounding cells to it is

(x+1, y)
(x-1, y)
(x, y+1)
(x, y-1)

and you might make assumptions that

+x axis is EAST
-x axis is WEST
+y axis is NORTH
-y axis is SOUTH

so

(x+1, y) is EAST to the cell,
(x-1, y) is WEST to the cell,
(x, y+1) is NORTH to the cell and 
(x, y-1) is SOUTH 

to the cell you pass as paremeter to your method.