Problem in Java “change in the status of a cell.”

Hello,
I have a small question about OOP. Let me explain:
I have a Grid object:
Code :

    1.import java.util.*;
    2.import java.io.*;
    3.import java.lang.Math;
    4.public class Grid {
    5.private static Cell[][] grid;
    6.private int sizeOfGrid;
    7.public Grid(int size) { // Déclaration d'un tableau de cellules
    8.sizeOfGrid = size;
    9.grid = new Cell[size][size];
   10.}

The grid object is an array of subject Cell:
Code :

    1.public class Cell {
    2.private CellStatus status;
    3.private int aliveNeighbour;
    4.public Cell() {
    5.status.makeCellDead();
    6.aliveNeighbour = 0;
    7.}

and finally, the class Cell contains an object CellStatus:

 
Code :

    1.public class CellStatus {
    2.private boolean alive;
    3.public CellStatus (boolean isAlive) {
    4.alive = isAlive;
    5.}

The Boolean object alive CellStatus can see if a cell is alive or dead. In the program, I have to change the status of a cell.

For example: grid [x] [y]. MakeCellDead ();

I wonder how I do it. If the variables must be static, etc …

thank you