控制台五子棋小游戏

五子棋游戏，第一步肯定是画棋盘初始化等工作，我们可以新建一个类来做这个事情。

public class Chessboard {// 定义一个二维数组充棋盘private String[][] board;// 定义棋盘大小public static final int BOARD_SIZE = 20;/*** 初始化棋盘* @return void*/public void initBoard() {// 初始化棋盘数组board = new String[BOARD_SIZE][BOARD_SIZE];// 把每个元素赋值为“十”，用于控制台输出棋盘for (int i = 0; i < BOARD_SIZE; i++) {for (int j = 0; j < BOARD_SIZE; j++) {board[i][j] = "十";}}}public void test() {Object[][] array = new Object[10][10];for (int i = 0; i < array[i].length; i++) {for (int j = 0; j < array[i].length; j++) {array[i][j] = new Object();}}}/*** 在控制台输出棋盘*/public void printBoard() {// 打印每个数组元素for (int i = 0; i < BOARD_SIZE; i++) {for (int j = 0; j < BOARD_SIZE; j++) {// 打印之后不换行System.out.print(board[i][j]);}// 打印完每一行数组元素就换行一次System.out.print("\n");}}/*** 给棋盘位置赋值* @param posX X 坐标* @param posY Y 坐标* @param chessman 棋子*/public void setBoard(int posX, int posY, String chessman) {this.board[posX][posY] = chessman;}/*** 返回棋盘* @return 返回棋盘*/public String[][] getBoard() {return this.board;}
}

下面肯定会有两种不一样的棋子，所以可以定义一个枚举类来设置两个棋子。

public enum Chessman {BLACK("●"),WHITE("○");private String chessman;/*** 私有构造器*/private Chessman (String chessman) {this.chessman = chessman;}public String getChessman() {return this.chessman;}
}

接下来我觉得最难的不是下棋，而是如何判断输赢，可以通过如下的方式判断输赢。下面的这些内容我觉得是五子棋的核心代码。

// 下面代码中的WIN_COUNT是达到赢的条件的棋子数量，对于五子棋来说当然是5了
/*** 判断输赢* @param posX*          棋子的X坐标* @param posY*          棋子的Y坐标* @param ico*          棋子的类型* @return*          如果有五颗相邻棋子连成一条直线，返回真，否则返回假*/private boolean isWon(int posX, int posY, String ico) {// 直线起点的X坐标int startX  = 0;// 直线的起点Y坐标int startY = 0;// 直线的结束点坐标int endX = Chessboard.BOARD_SIZE - 1;// 直线的结束Y坐标int endY = endX;// 同一条线上相邻棋子累积树int sameCount = 0;int temp = 0;// 计算起点的最小X坐标与Y坐标temp = posX - WIN_COUNT + 1;startX = temp < 0 ? 0 : temp;temp = posY - WIN_COUNT + 1;startY = temp < 0 ? 0: temp;// 计算终点的最大X坐标与Y坐标temp = posX + WIN_COUNT - 1;endX = temp > Chessboard.BOARD_SIZE - 1 ? Chessboard.BOARD_SIZE - 1 : temp;temp = posY + WIN_COUNT - 1;endY = temp > Chessboard.BOARD_SIZE - 1 ? Chessboard.BOARD_SIZE - 1 : temp;// 从左向右方向计算相邻棋子的数目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;}}if (sameCount != WIN_COUNT - 1)sameCount = 0;if (sameCount == 0) {// 从上到下方向计算相邻棋子的数目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;}}}if (sameCount != WIN_COUNT - 1)sameCount = 0;if (sameCount == 0) {// 从左上到右下计算相同相邻棋子的数目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 != WIN_COUNT - 1)sameCount = 0;if (sameCount == 0) {int i = endX;for (int j = startY; j < endY; j++) {if (i > startX) {if (board[i][j] == ico && board[i-1][j+1] == ico) {sameCount++;} else if (sameCount != WIN_COUNT - 1) {sameCount = 0;}i--;}}}return sameCount == WIN_COUNT - 1 ? true : false;}

每次从下棋的位置为中心搜寻能够产生胜者的四条线上是否达到了赢的条件。
下面是该类的全部代码。

import java.io.BufferedReader;
import java.io.InputStreamReader;public class GobangGame {// 定义达到赢的条件的棋子数目private final int WIN_COUNT = 5;// 定义用户输入的坐标Xprivate int posX = 0;// 定义用户输入的Y坐标private int posY = 0;// 定义棋盘private Chessboard chessboard;/*** 空的构造器*/public GobangGame(){}/*** 构造器，初始化棋盘和棋子属性** @param chessboard*          棋盘类*/public GobangGame (Chessboard chessboard) {this.chessboard = chessboard;}/*** 检查输入是否合法** @param inputStr*          有控制台输入的字符串。* @return*          字符串合法返回true，反则返回false。*/public boolean isValid(String inputStr) {// 将用户输入的字符串以逗号隔开，分成两个字符串String[] posStrArr = inputStr.split(",");try {posX = Integer.parseInt(posStrArr[0]) - 1;posY = Integer.parseInt(posStrArr[1]) - 1;} catch (NumberFormatException e) {chessboard.printBoard();System.out.println("请以(数字, 数字)的格式输入：");return false;}// 检查输入值是否在范围内if (posX < 0 || posX >= Chessboard.BOARD_SIZE || posY < 0|| posY >= Chessboard.BOARD_SIZE) {chessboard.printBoard();System.out.println("X与Y坐标只能大于等于1，与小于等于" + Chessboard.BOARD_SIZE+ "请重新输入：");return false;}// 检查是否已经有棋子String[][] board = chessboard.getBoard();if (board[posX][posY] != "十") {chessboard.printBoard();System.out.println("此位置已经有棋子了，请重新输入：");return false;}return true;}/*** 开始下棋*/public void start() throws Exception {// true游戏结束boolean isOver = false;chessboard.initBoard();chessboard.printBoard();// 获取键盘输入BufferedReader br = new BufferedReader(new InputStreamReader(System.in));String inputStr = null;// br.readLine:每当键盘输入一行内容按回车键，则输入的内容被br读取到while ((inputStr = br.readLine()) != null) {isOver = false;if (!isValid(inputStr)) {// 如果不合法，要求重新输入，在继续continue;}// 把对应的数组元素赋值为“●”String chessman = Chessman.BLACK.getChessman();chessboard.setBoard(posX, posY, chessman);// 判断用户是否赢了if (isWon(posX, posY, chessman)) {isOver = true;} else {// 计算机随机选择坐标位置int[] computerPosAr = computerDo();chessman = Chessman.WHITE.getChessman();chessboard.setBoard(computerPosAr[0], computerPosAr[1], chessman);// 判断计算机是否赢了if (isWon(computerPosAr[0], computerPosAr[1], chessman)) {isOver = true;}}// 如果产生胜者，询问用户是否继续if (isOver) {// 如果继续，重新初始化棋盘，继续游戏if (isReplay(chessman)) {chessboard.initBoard();chessboard.printBoard();continue;}// 如果不继续break;}chessboard.printBoard();System.out.println("请输入您下棋的坐标，应以x, y格式输入：");}}/*** 是否重新开始下棋* @param chessman*          "●"为用户，"○"为计算机* @return 开始为true，反则返回false。*/private boolean isReplay(String chessman) throws Exception{chessboard.printBoard();String message = chessman.equals(Chessman.BLACK.getChessman()) ? "恭喜您，您赢了，": "分遗憾，您输了，";System.out.println(message + "再下一局？(y/n)");BufferedReader br = new BufferedReader(new InputStreamReader(System.in));boolean flag = false;do {String s = br.readLine();if (s.equals("y")) {return true;}else if (s.equals("n")) {return false;} else {System.out.println("请重新输入：");flag = true;}} while (flag);return true;}/**** 计算机随机下棋*/private int[] computerDo() {int posX = (int) (Math.random() * (Chessboard.BOARD_SIZE - 1));int posY = (int) (Math.random() * (Chessboard.BOARD_SIZE - 1));String[][] board = chessboard.getBoard();while (board[posX][posY] != "十") {posX = (int) (Math.random() * (Chessboard.BOARD_SIZE - 1));posY = (int) (Math.random() * (Chessboard.BOARD_SIZE - 1));}int[] result = {posX, posY};return  result;}/*** 判断输赢* @param posX*          棋子的X坐标* @param posY*          棋子的Y坐标* @param ico*          棋子的类型* @return*          如果有五颗相邻棋子连成一条直线，返回真，否则返回假*/private boolean isWon(int posX, int posY, String ico) {// 直线起点的X坐标int startX  = 0;// 直线的起点Y坐标int startY = 0;// 直线的结束点坐标int endX = Chessboard.BOARD_SIZE - 1;// 直线的结束Y坐标int endY = endX;// 同一条线上相邻棋子累积树int sameCount = 0;int temp = 0;// 计算起点的最小X坐标与Y坐标temp = posX - WIN_COUNT + 1;startX = temp < 0 ? 0 : temp;temp = posY - WIN_COUNT + 1;startY = temp < 0 ? 0: temp;// 计算终点的最大X坐标与Y坐标temp = posX + WIN_COUNT - 1;endX = temp > Chessboard.BOARD_SIZE - 1 ? Chessboard.BOARD_SIZE - 1 : temp;temp = posY + WIN_COUNT - 1;endY = temp > Chessboard.BOARD_SIZE - 1 ? Chessboard.BOARD_SIZE - 1 : temp;// 从左向右方向计算相邻棋子的数目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;}}if (sameCount != WIN_COUNT - 1)sameCount = 0;if (sameCount == 0) {// 从上到下方向计算相邻棋子的数目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;}}}if (sameCount != WIN_COUNT - 1)sameCount = 0;if (sameCount == 0) {// 从左上到右下计算相同相邻棋子的数目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 != WIN_COUNT - 1)sameCount = 0;if (sameCount == 0) {int i = endX;for (int j = startY; j < endY; j++) {if (i > startX) {if (board[i][j] == ico && board[i-1][j+1] == ico) {sameCount++;} else if (sameCount != WIN_COUNT - 1) {sameCount = 0;}i--;}}}return sameCount == WIN_COUNT - 1 ? true : false;}/*** 开始玩游戏*/public static void main(String[] args) throws Exception{GobangGame gb = new GobangGame(new Chessboard());gb.start();}
}