Tic Tac Toe Game java using only methods and 2d arrays

Question

Still cannot figure out what im doing wrong. I have no idea how to get the CPU choice into the board. I did get the board to re display the updated board with the row and column the player selected. I need to have 4 methods and id like them to do exactly only this: 1) displayBoard (takes single passed parameter of 2d array representing current tic tac toe board. 2.) makeAMove (takes 2 passed parameters: Two dimensional array representing tictactoe board and player character value ('X' or 'O'). Updates array with valid row and column selected by player character. This method does NOT return anything, it simply updates the board array. 3.) hasWon (Takes 2 passed parameters, 2 dimensional array representing TicTacToe board and player character ('X' or 'O'). Return TRUE if player character has won, FALSE otherwise. 4.) boardFull (Takes single passed parameter of two dimensional array representing TicTacToe board and return TRUE if all cells are occupied, false otherewise. These area ll th…

Accepted Answer

You just have to do this:

```
board[rowNumber][columnNumber] = player;
```

Of course you would have to check beforehand that cell is not already occupied. If yes, then ask again for user input. I guess that wouldn't be that tough.

Apart from that, I would suggest you some improvements to your code:

Rather than having two players as `char` types, use an `enum Player`, with two constants - `X` and `O`. And use a `Player[]` instead.

```
enum Player {
    X, O;
}
```

No need to initialize your array with `'1', '2', ...`. Now that they will be `null` by default.

Rather than having `board` as local variable, and passing it in all the methods, make it a field in your class.

Currently your code is making just one move. Why? Also, you're not even using the return value of `hasWon()` and `boardFull()` method.

You can divide the `hasWon` method into 3 methods - `hasWonHorizontal()`, `hasWonVertical()`, `hasWonDiagonal()`. This will avoid that long `if` condition in the same method. And then call these 3 methods in sequence from `hasWon()` method.

Tic Tac Toe Game java using only methods and 2d arrays

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