JAVA question

PROBLEM PROMPT: Board Games

For this problem, you are given an interface Game that describes a 2-player grid-based board game: Game.java. Game declares the following methods:

1. boolean isValidMove(String move) // returns true if the move represented by the String is valid
2. void executeMove(String move) // executes the move represented by the String
3. boolean gameOver() // returns true if the game is over
4. String displayBoard() // returns a String representing the current state of the board
5. int determineWinner() // if there is a winner, returns the player number of the winner (either 1 or 2); if no winner, returns 0

Note that with these five methods alone, this interface is flexible enough to handle games such as tic-tac-toe, Connect Four, chess, checkers, Othello, the game of Nim, etc. Your job is to provide implementations of the Game interface for two of these games: tic-tac-toe and Connect Four. Specifically, you must implement two classes that implement the Game interface: TicTacToeGame and ConnectFourGame.

ConnectFourGame

• ConnectFourGame has a 6 x 7 board on which players can place either a red or a yellow piece (represented by 'r' and 'y', respectively). However, in Connect Four, unlike tic-tac-toe, each column is a "chute" into which a player drops a piece to make a move. The pieces fill up the column one by one (up to 6 pieces in one column). If you are unfamiliar with the game, please see https://en.wikipedia.org/wiki/Connect_Four (Links to an external site.) and/or look it up on youtube.
• A "move" in ConnectFourGame is a string that contains the column number (0-6), and the character to mark the space with (either 'r' or 'y'). For example, placing a red piece down the last column would be done with the command: "6r".
• A "move" in ConnectFourGame is valid if:
  • The column number represents a valid column on the board that is not already full
  • The mark is 'r' if it is r's turn, or 'y' if it is y's turn.
• Whoever makes the first move is player 1. For instance, if 'r' makes the first move, then 'r' is player 1 (and 'y' is player 2), and vice-versa.
• A player wins by getting 4 in a row, either horizontally, vertically, or diagonally
• A game is over if there are no more moves, or a player has won.

Game Driver and Game engine are provided,

package labs.lab5;

import java.util.Scanner;

public class GameDriver { public static void main(String[] args) { System.out.println("Which game do you want to play? Enter 1 for Tic-Tac-Toe, 2 for Connect Four: "); Scanner scanner = new Scanner(System.in); int option = scanner.nextInt(); GameEngine gamePlayer; if (option == 1) { gamePlayer = new GameEngine(new TicTacToeGame()); } else { gamePlayer = new GameEngine(new ConnectFourGame()); } gamePlayer.play(); } }

package labs.lab5;

import java.util.Scanner;

/** * General player for two-player game. */ public class GameEngine { private Game game; private int playerTurn;

/** * Create a game player for the provided game. * * @param game game model */ public GameEngine(Game game) { this.game = game; this.playerTurn = 1; }

/** * Play the game. */ public void play() { Scanner scanner = new Scanner(System.in);

System.out.println(game.displayBoard());

while (!game.gameOver()) { String move = getMove(scanner); game.executeMove(move); switchPlayer(); System.out.println(game.displayBoard()); }

printWinner(); }

private String getMove(Scanner scanner) { boolean valid; String move; do { System.out.print(" Enter move Player " + playerTurn + ": "); move = scanner.next(); valid = game.isValidMove(move); if (!valid) { System.out.println("Invalid move!"); } } while (!valid);

return move; }

private void switchPlayer() { if (playerTurn == 1) { playerTurn = 2; } else { playerTurn = 1; } }

private void printWinner() { int winner = game.determineWinner(); if (winner > 0) { System.out.println(" Player " + winner + " wins!"); } else { System.out.println(" Nobody wins."); } } }