Help Finishing a Program

[Madarawolf]

I'm trying to write a program that creates a tic-tac-toe board using an array and then lets you play it. I need help writing the code that checks if a player has won using a method.
Here is what I have:

public static char checkForWin(char [][] board){
        char retval = 'F'; // 
        int xCount = 0;
        int oCount = 0;
        
        for(int row = 0; row < board.length; row++){
            for(int col = 0; col < board.length; col++){
                if(board[row][col] == 'X')
                    xCount+= 1;
                else if(board[row][col] == 'O')
                    oCount+= 1;
            }
        }
        
        if(xCount < board.length || oCount < board.length)
            retval = 'N';
        else if(xCount == board.length)
            retval = 'X';
        else if(oCount == board.length)
            retval = 'O';
                    
        return retval;

then where the method is called:

win = checkForWin(board);
            } while(win == 'N'); // must be F, O or X to leave loop
            if(win == 'F'){
                System.out.printf("\nThe board is Full: no Winner\n");
            } else {
                System.out.printf("\nThe winner is %c\n", win);