tic-tac-toe board

the programme below contains no errors but when i run it nothing is displayed can u please help me rectify this problems. thanks you again!!!

/**
A 3 x 3 tic-tac-toe board.
*/
public class TicTacToe
{
/**
Constructs an empty board.
*/
public TicTacToe()
{
board = new char[ROWS][COLUMNS];

// fill with spaces
for (int i = 0; i < ROWS; i++)
for (int j = 0; j < COLUMNS; j++)
board[i][j] = ' ';
}
/**
Set a field in the board. The field must be unoccupied.
@param i the row index
@param j the column index
@param player the player('x' or 'o')
*/
public void set(int i, int j, char player)
{
if (board[i][j] != ' ')
throw new IllegalArgumentException("Position occupied");
board[i][j] = player;
}
/**
Creates a string representation of the board such as
|x o|
| x |
| o|.
@return the string representation
*/
public String toString()
{
String r = "";
for (int i = 0; i < ROWS; i++)
{
r = r + "|";
for(int j = 0; j < COLUMNS; j++)
r = r + board[i][j];
r = r + "|\n";
}
return r;
}
private char[][] board;
private static final int ROWS = 3;
private static final int COLUMNS = 3;
}

Is this for a Mobile device?

First you are creating a board object, but you have no paint or Graphics going on here. That is why nothing is displayed.

If youa re using J2ME, I would create a Form that extends Canvas and in the paint method write the code to draw the lines of the tic-tac-toe game.

Mark

Looks like this isn't J2ME question, since all your other posts aren't either.

Moving to Java In General (Beginner) forum.

Mark

at a glance it looks like it should do what you want. Do you have another program that creates an instance, sets a few cells to X or O, then prints the toString()? What do you get from that?

no

Ofcourse it works. Add a main method and try: