1.棋盤類          

/** * 棋盤 *  */public class Chessboard {	// 定義一個二維數組來充當棋盤	PRivate String[][] board;	// 定義棋盤的大小	public  final int BOARD_SIZE = 15;	/**	 * 初始化棋盤	 * 	 * @return void	 */	public void initBoard() {		board = new String[BOARD_SIZE][BOARD_SIZE];		// 把每個元素賦值為“十”，用于控制臺輸出棋盤		for (int i = 0; i < BOARD_SIZE; i++) {			for (int j = 0; j < BOARD_SIZE; j++) {				board[i][j] = "十";			}		}	}	/**	 * 在控制臺輸出棋盤	 */	public void printBoard() {		// 打印每個數組元素		for (int i = 0; i < BOARD_SIZE; i++) {			for (int j = 0; j < BOARD_SIZE; j++) {								System.out.print(board[i][j]);// 打印后不換行			}						System.out.print("/n");// 每打印完一行數組元素就換行一次		}	}	/**	 * 給棋盤位置賦值	 * 	 * @param posX	 *            X坐標	 * @param posY	 *            Y坐標	 * @param chessman	 *            棋子	 */	public void setBoard(int posX, int posY, String chessman) {		board[posX][posY] = chessman;	}	/**	 * 返回棋盤	 * 	 * @return 返回棋盤	 */	public String[][] getBoard() {		return board;	}		public int getBoardSize() {		return BOARD_SIZE;	}}2.棋手類----你和電腦
public class ChessMan {	static final String blackChessman="●"; 	static final String whiteChessman="○";	/**	 * @return String 黑棋	 */	public static String getBlackChessman() {		return blackChessman;	}	/**	 * @return String 白棋	 */	public static String getWhiteChessman() {		return whiteChessman;	}}
3.五子棋的具體實現類
import java.io.BufferedReader;import java.io.InputStreamReader;import java.util.Random;import java.util.Scanner;/** * 五子棋游戲類 *  */public class GobangGame {	private final int WIN_COUNT = 5;// 定義達到贏條件的棋子數目	private int posX = 0;// 定義用戶輸入的X坐標	private int posY = 0;// 定義用戶輸入的X坐標	private Chessboard chessboard;// 定義棋盤	/**	 * 構造器，初始化棋盤和棋子屬性	 * 	 * @param chessboard	 *            棋盤類	 */	public GobangGame(Chessboard chessboard) {		this.chessboard = chessboard;	}	/**	 * 檢查輸入是否合法。	 * 	 * @param inputStr	 *            由控制臺輸入的字符串。	 * @return 字符串合法返回true,反則返回false。	 */	public boolean isValid(String inputStr) {		// 將用戶輸入的字符串以逗號(,)作為分隔，分隔成兩個字符串		String[] posStrArr = inputStr.split(",");		try {			posX = Integer.parseInt(posStrArr[0]) - 1;//用戶棋子的X坐標			posY = Integer.parseInt(posStrArr[1]) - 1;//用戶棋子的Y坐標		} catch (NumberFormatException e) {			chessboard.printBoard();			System.out.println("請以(數字,數字)的格式輸入：");			return false;		}				// 檢查輸入數值是否在范圍之內		if (posX < 0 || posX >= chessboard.getBoardSize() || posY < 0				|| posY >= chessboard.getBoardSize() ) {			chessboard.printBoard();			System.out.println("X與Y坐標只能大于等于1,與小于等于" + chessboard.getBoardSize() 					+ ",請重新輸入：");			return false;		}				// 檢查輸入的位置是否已經有棋子		String[][] board = chessboard.getBoard();		if (board[posX][posY] != "十") {			chessboard.printBoard();			System.out.println("此位置已經有棋子，請重新輸入：");			return false;		}				return true;	}	/**	 * 開始下棋	 */	public void start() throws Exception {		chessboard.initBoard();		chessboard.printBoard();				Scanner scan = new Scanner(System.in);				boolean isOver = false;// true為游戲結束		while(!isOver){			System.out.print("請輸入棋子的位置：");			String inputStr = scan.nextLine();			//isOver = false;			if (!isValid(inputStr)) {								continue;// 如果不合法，要求重新輸入，再繼續			}						String chessman =ChessMan.getBlackChessman();			chessboard.setBoard(posX, posY,chessman);			// 判斷用戶是否贏了			if (isWon(posX, posY,chessman)) {				isOver = true;			} else {				// 計算機隨機選擇位置坐標				int[] computerPosArr = computerDo();				chessman = ChessMan.getWhiteChessman();				chessboard.setBoard(computerPosArr[0], computerPosArr[1],chessman);				// 判斷計算機是否贏了				if (isWon(computerPosArr[0], computerPosArr[1], chessman)) {					isOver = true;				}			}			// 如果產生勝者，詢問用戶是否繼續游戲			if (isOver) {				// 如果繼續，重新初始化棋盤，繼續游戲				if (isReplay(chessman)) {					isOver = false;					chessboard.initBoard();					chessboard.printBoard();					continue;				}				// 如果不繼續，退出程序				break;			}			chessboard.printBoard();		}	}	/**	 * 是否重新開始下棋。	 * 	 * @param chessman	 *            "●"為用戶，"○"為計算機。	 * @return 開始返回true，反則返回false。	 */	public boolean isReplay(String chessman) throws Exception {		chessboard.printBoard();		String playerWin = "恭喜您，您贏了，";		String computerWin = "很遺憾，您輸了，";		String message = chessman.equals(ChessMan.getBlackChessman()) ? playerWin:computerWin ;		System.out.println(message + "再下一局？(y/n)");		Scanner scan = new Scanner(System.in);		if (scan.next().equals("y")) {			// 開始新一局			return true;		}		return false;	}	/**	 * 計算機隨機下棋	 */	public int[] computerDo() {		Random random = new Random();		int posX =  random.nextInt(chessboard.getBoardSize()-1);		int posY =  random.nextInt(chessboard.getBoardSize()-1);		String[][] board = chessboard.getBoard();		while (board[posX][posY] != "十" && board[posX][posY]!=ChessMan.getBlackChessman()&& board[posX][posY]!=ChessMan.getWhiteChessman()) {			posX = random.nextInt(chessboard.getBoardSize()-1);			posY = random.nextInt(chessboard.getBoardSize()-1);		}		int[] result = { posX, posY };		return result;	}	/**	 * 判斷輸贏	 * 	 * @param posX	 *            棋子的X坐標。	 * @param posY	 *            棋子的Y坐標	 * @param ico	 *            棋子類型	 * @return 如果有五顆相鄰棋子連成一條直接，返回真，否則相反。	 */	public boolean isWon(int posX, int posY, String ico) {		int startX = 0;// 直線起點的X最小坐標		int startY = 0;// 直線起點Y最小坐標			int endX = chessboard.getBoardSize()-1;// 直線結束X最大坐標				int endY = chessboard.getBoardSize()-1;// 直線結束Y最大坐標				int sameCount = 0;// 同條直線上相鄰棋子累積數		int temp = 0;		// 計算起點的最小X坐標與Y坐標		temp = posX - WIN_COUNT + 1;		startX = (temp<0)? 0:temp;		temp = posY - WIN_COUNT + 1;		startY = (temp<0)?0:temp;		// 計算終點的最大X坐標與Y坐標		temp = posX + WIN_COUNT - 1;		endX = temp > (chessboard.getBoardSize()-1)?(chessboard.getBoardSize()-1):temp;		temp = posY + WIN_COUNT - 1;		endY = temp >(chessboard.getBoardSize()-1)?(chessboard.getBoardSize()-1):temp;					// 計算一行中相同棋子的數目		String[][] board = chessboard.getBoard();		for (int i = startY; i < endY; i++) {			if (board[posX][i] == ico && board[posX][i + 1] == ico) {				sameCount++;			} else if (sameCount < WIN_COUNT - 1) {				sameCount = 0;			}		}				// 計算一行中相同棋子的數目		if (sameCount == 0) {			for (int i = startX; i < endX; i++) {				if (board[i][posY] == ico && board[i + 1][posY] == ico) {					sameCount++;				} else if (sameCount < WIN_COUNT - 1) {					sameCount = 0;				}			}		}				// 從左上到右下計算相同棋子的數目		if (sameCount == 0) {			int j = startY;			for (int i = startX; i < endX; i++) {				if (j < endY) {					if (board[i][j] == ico && board[i + 1][j + 1] == ico) {						sameCount++;					} else if (sameCount < WIN_COUNT - 1) {						sameCount = 0;					}					j++;				}			}		}				if (sameCount == 0) {			// 從右上到左下計算相同棋子的數目			int j = startX;			for (int i = endY; i > startY; i--) {				if (j < endY) {					if (board[i][j] == ico && board[i-1][j+1] == ico) {						sameCount++;					} else if (sameCount < WIN_COUNT - 1) {						sameCount = 0;					}					j++;				}			}		}				return sameCount >= (WIN_COUNT-1)?true:false;	}}4.控制類
import java.util.Scanner;public class Main {	public static void main(String[] args) throws Exception {		GobangGame gb = new GobangGame(new Chessboard());		gb.start();	}}源代碼