Making a Tic-Tac-Toe Game using Java.

Winner can win horizontally, diagonally, and vertically. Not only that I have to have flexibility in expanding the tic-tac-toe game to be able to fit any size and not just 3x3. For example, it can be 4x4 and it'll somewhat become like connecting four instead or even 2x2. However the default size is 3x3 if no input is placed.

If the size of the board is less than 1, throw an IllegalArgumentException.

If the "X" and "O" are not within the board such as in a 3x3 board if the user declares X to be at location (4,1), throw an IndexOutOfBoundException.

So I am suppose to use the following public methods:

public TTTBoard(int size)

public TTTBoard()

public char get(int r, int c) //return the character at the position (r,c)

public void set(int r, int c, char ch) //Change an already set character to another one.

public int size() //Makes the size, must be flexible not just 3x3

public char winner() //Finds the winner

public String toString() //Draws the board

| | -+-+- O| | -+-+- |X| //Example of how the board string should look like