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c1/TicTacToe.java

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+// **THIS IS AN EXAMPLE IMPLEMENTATION!**
+// Brett Wortzman
+// CSE 123
+// C0: Abstract Strategy Games
+//
+// A class to represent a game of tic-tac-toe that implements the 
+// AbstractStrategyGame interface.
+import java.util.*;
+
+public class TicTacToe extends AbstractStrategyGame {
+    private char[][] board;
+    private boolean isXTurn;
+
+    // Constructs a new TicTacToe game.
+    public TicTacToe() {
+        board = new char[][]{{'-', '-', '-'},
+                             {'-', '-', '-'},
+                             {'-', '-', '-'}};
+        isXTurn = true;
+    }
+
+    // Returns whether or not the game is over.
+    public boolean isGameOver() {
+        return getWinner() >= 0;
+    }
+
+    // Returns the index of the winner of the game.
+    // 1 if player 1 (X), 2 if player 2 (O), 0 if a tie occurred,
+    // and -1 if the game is not over.
+    public int getWinner() {
+        for (int i = 0; i < board.length; i++) {
+            // check row i
+            if (board[i][0] == board[i][1] && board[i][0] == board[i][2] && board[i][0] != '-') {
+                return board[i][0] == 'X' ? 1 : 2;
+            }
+
+            // check col i
+            if (board[0][i] == board[1][i] && board[0][i] == board[2][i] && board[0][i] != '-') {
+                return board[0][i] == 'X' ? 1 : 2;
+            }
+        }
+
+        // check diagonals
+        if (board[0][0] == board[1][1] && board[0][0] == board[2][2] && board[0][0] != '-') {
+            return board[0][0] == 'X' ? 1 : 2;
+        }        
+        if (board[0][2] == board[1][1] && board[0][2] == board[2][0] && board[0][2] != '-') {
+            return board[0][2] == 'X' ? 1 : 2;
+        }
+
+        // check for tie
+        for (int i = 0; i < board.length; i++) {
+            for (int j = 0; j < board[i].length; j++) {
+                if (board[i][j] == '-') {
+                    // unfilled space; game not over
+                    return -1;
+                }
+            }
+        }
+
+        // it's a tie!
+        return 0;
+    }
+
+    // Returns the index of which player's turn it is.
+    // 1 if player 1 (X), 2 if player 2 (O), -1 if the game is over
+    public int getNextPlayer() {
+        if (isGameOver()) {
+            return -1;
+        }
+        return isXTurn ? 1 : 2;
+    }
+
+    // Given the input, places an X or an O where
+    // the player specifies.
+    // Throws an IllegalArgumentException if the position is
+    // invalid, whether that be out of bounds or already occupied.
+    // Board bounds are [0, 2] for both rows and cols.
+    public void makeMove(Scanner input) {
+        char currPlayer = isXTurn ? 'X' : 'O';
+
+        System.out.print("Row? ");
+        int row = input.nextInt();
+        System.out.print("Column? ");
+        int col = input.nextInt();
+
+        makeMove(row, col, currPlayer);
+        isXTurn = !isXTurn;
+    }
+
+    // Private helper method for makeMove.
+    // Given a row and col, as well as player index,
+    // places an X or an O in that row and col.
+    // Throws an IllegalArgumentException if the position is
+    // invalid, whether that be out of bounds or already occupied.
+    // Board bounds are [0, 2] for both rows and cols.
+    private void makeMove(int row, int col, char player) {
+        if (row < 0 || row >= board.length ||
+            col < 0 || col >= board[0].length) {
+                throw new IllegalArgumentException("Invalid board position: " + row + "," + col);
+        }
+
+        if (board[row][col] != '-') {
+            throw new IllegalArgumentException("Space already occupied: " + row + "," + col);
+        }
+        
+        board[row][col] = player;
+    }
+
+    // Returns a String containing instructions to play the game.
+    public String instructions() {
+        String result = "";
+        result += "Player 1 is X and goes first. Choose where to play by entering a row and\n";
+        result += "column number, where (0, 0) is the upper left and (2, 2) is the lower right.\n";
+        result += "Spaces show as a - are empty. The game ends when one player marks three spaces\n";
+        result += "in a row, in which case that player wins, or when the board is full, in which\n";
+        result += "case the game ends in a tie.";
+        return result;
+    }
+
+    // Returns a String representation of the current state of the board.
+    public String toString() {
+        String result = "";
+        for (int i = 0; i < board.length; i++) {
+            for (int j = 0; j < board.length; j++) {
+                result += board[i][j] + " ";
+            }
+            result += "\n";
+        }
+        return result;
+    }
+}