public class TicTacToe
{
    private char[][] board;
    private static final char X = 'X';
    private static final char O = 'O';
    private static final char EMPTY = ' ';
    
    public TicTacToe(int size)
    {
        board = new char[size][size];
        initialize();
    }
    
    private void initialize()
    {
        for(int row=0; row < board.length; row++)
        {
            for(int col=0; col < board[row].length; col++)
            {
                board[row][col] = X;
            }
        }
    }
    
    public String toString()
    {
        String str = "";
        
        for(int row=0; row < board.length; row++)
        {
            for(int col=0; col < board[row].length; col++)
            {
                str += board[row][col];
                if(col != board[row].length - 1)
                    str += "|";
            }
            str += "\n";
            
            if(row != board.length - 1)
            {
                //draw separator
                for(int col=0; col < board[row].length; col++)
                {
                    str += "—";
                    if(col != board[row].length - 1)
                         str += "+";
                }
                str += "\n";
            }
            
            
        }
        
        return str;
    }
}