How to edit an array from another class in Java [duplicate]

Question

I have created a 2d array (used as a playing board) and in another class I want to take my array and be able to perform operations on it.

My array definition (in class PlayingBoard):

public char[][] myGrid = new char[12][12];

Now I want to manipulate this array from other classes in my project. I tried to call this grid in the class it was not defined in

int i, j;
for(i = 0; i < 12; i++) {
    for(j = 0; j < 12; j++) {
        PlayingBoard.myGrid[i][j] = 'x';
    }
}

I get the error:

Non-static variable myGrid cannot be referenced from static context

How can I reference, edit, and operate on myGrid from this second class?

Answer 1

You must change one of the two things:

1. declare myGrid as static

   public static char[][] myGrid = new char[8][8];
   

2. access myGrid via an object instance:

   PlayingBoard pb = new PlayingBoard();
   int i, j;
   for(i = 0; i < 12; i++) {
       for(j = 0; j < 12; j++) {
           pb.myGrid[i][j] = 'x';
       }
   }