TicTacToe.java

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/**
 *
 * @author Amirhossein Aleyasen <aleyase2@illinois.edu>
 * created on Jan 25, 2016, 9:38:45 PM
 */
public class TicTacToe {

    public static void main(String[] args) {

    }

    public String ticTacToeCheck(String[][] game) {

        for (int i = 0; i < 3; i++) { // checks for rows if we can find any winner
            if (game[i][0].equals(game[i][1]) && game[i][0].equals(game[i][2])) { // check if we have a winner in row i
                return game[i][0]; // return the winner character
            }
        }

        for (int j = 0; j < 3; j++) { //checkes for columns if we ca find any winner
            if (game[0][j].equals(game[1][j]) && game[0][j].equals(game[2][j])) { // check if we have a winner in column j
                return game[0][j]; // return the winner character
            }
        }

        if (game[0][0].equals(game[1][1]) && game[0][0].equals(game[2][2])) { //check for main diagonal 
            return game[0][0]; // return the winner character
        }

        if (game[0][2].equals(game[1][1]) && game[0][2].equals(game[2][0])) { //check for the second diagonal
            return game[0][2]; //return the winner character
        }

        return "C"; // if the game ended in tie's. 
    }
}