Crazy Java Practice 第1章 控制台五子棋

package org.crazyit.gobang;

import java.io.BufferedReader;
import java.io.InputStreamReader;

/**
 * 五子棋游戏类
 * 
 * @author yangenxiong [e-mail]
 * @author Kelvin Mak [e-mail]
 * @version  1.0
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br>Copyright (C), 2009-2010, yangenxiong
 * <br>This program is protected by copyright laws.
 */
public class GobangGame {
	// 定义达到赢条件的棋子数目
	private final int WIN_COUNT = 5;
	// 定义用户输入的X坐标
	private int posX = 0;
	// 定义用户输入的X坐标
	private int posY = 0;
	// 定义棋盘
	private Chessboard chessboard;

	/**
	 * 空构造器
	 */
	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
	 *            由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(,)作为分隔，分隔成两个字符串
		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;
		}
		// 检查输入数值是否在范围之内
		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;
		}
		// 检查输入的位置是否已经有棋子
		String[][] board = chessboard.getBoard();
		if (board[posX][posY] != "十") {
			chessboard.printBoard();
			System.out.println("此位置已经有棋子，请重新输入：");
			return false;
		}
		return true;
	}

	/**
	 * 开始下棋
	 */
	public void start() throws Exception {
		// true为游戏结束
		boolean isOver = false;
		chessboard.initBoard();
		chessboard.printBoard();
		// 获取键盘的输入
		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，再继续
				continue;
			}
			// 把对应的数组元素赋为"●"
			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 {
				// 计算机随机选择位置坐标
				int[] computerPosArr = computerDo();
				chessman = Chessman.WHITE.getChessman();
				chessboard.setBoard(computerPosArr[0], computerPosArr[1],
						chessman);
				// 判断计算机是否赢了
				if (isWon(computerPosArr[0], computerPosArr[1], chessman)) {
					isOver = true;
				}
			}
			// 如果产生胜者，询问用户是否继续游戏
			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，退出程序
				break;
			}
			chessboard.printBoard();
			System.out.println("请输入您下棋的坐标，应以x,y的格式输入：");
		}
	}

	/**
	 * 是否重新开始下棋。
	 * 
	 * @param chessman
	 *            "●"为用户，"○"为计算机。
	 * @return 开始返回true，反则返回false。
	 */
	public boolean isReplay(String chessman) throws Exception {
		chessboard.printBoard();
		String message = chessman.equals(Chessman.BLACK.getChessman()) ? "恭喜您，您赢了，"
				: "很遗憾，您输了，";
		System.out.println(message + "再下一局？(y/n)");
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		if (br.readLine().equals("y")) {
			// 开始新一局
			return true;
		}
		return false;

	}

	/**
	 * 计算机随机下棋
	 */
	public 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
	 *            棋子类型
	 * @return 如果有五颗相邻棋子连成一条直接，返回真，否则相反。
	 */
	public boolean isWon(int posX, int posY, String ico) {
		// 直线起点的X坐标
		int startX = 0;
		// 直线起点Y坐标
		int startY = 0;
		// 直线结束X坐标
		int endX = Chessboard.BOARD_SIZE - 1;
		// 直线结束Y坐标
		int endY = endX;
		// 同条直线上相邻棋子累积数
		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;
		// 从左到右方向计算相同相邻棋子的数目
		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 == 0) {
			// 从上到下计算相同相邻棋子的数目
			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 == 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++;
				}
			}
		}
		return sameCount == WIN_COUNT - 1 ? true : false;
	}

	public static void main(String[] args) throws Exception {

		GobangGame gb = new GobangGame(new Chessboard());
		gb.start();
	}
}

package org.crazyit.gobang;

/**
 * 棋子枚举类
 * 
 * @author yangenxiong [e-mail]
 * @author Kelvin Mak [e-mail]
 * @version  1.0
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br>Copyright (C), 2009-2010, yangenxiong
 * <br>This program is protected by copyright laws.
 */
public enum Chessman {
	BLACK("●"), WHITE("○");
	private String chessman;

	/**
	 * 私有构造器
	 */
	private Chessman(String chessman) {
		this.chessman = chessman;
	}

	/**
	 * @return String 黑棋或者白棋
	 */
	public String getChessman() {
		return this.chessman;
	}
}

package org.crazyit.gobang;

/**
 * 棋盘对象
 * 
 * @author yangenxiong [e-mail]
 * @author Kelvin Mak [e-mail]
 * @version  1.0
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br>Copyright (C), 2009-2010, yangenxiong
 * <br>This program is protected by copyright laws.
 */
public class Chessboard {
	// 定义一个二维数组来充当棋盘
	private String[][] board;
	// 定义棋盘的大小
	public static final int BOARD_SIZE = 22;

	/**
	 * 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.length; i++) {
			for (int j = 0; j < array[i].length; j++) {
				array[i][j] = new Object();
			}
		}
	}

	/**
	 * 在控制台输出棋盘的方法
	 */
	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++) {
				// 打印后不换行
				System.out.print(board[i][j]);
			}
			// 每打印完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;
	}
}

isWon() 必须加入这段代码（随书代码无此段代码），否则，撇方向（斜杠/）方向的同色棋子不会得到检测

		if (sameCount == 0) {
			int j=1;
			for(int i = posX; i <= endX; i++){
				if((posX + j <= endX) && (posY - j >= startY)){
					if (board[posX][posY] == ico && board[posX + j][posY - j] == ico) {
						sameCount++;
					} else if (sameCount != WIN_COUNT - 1) {
						sameCount = 0;
					}
					j++;
				}
			}
			j=1;
			for(int i = posX; i >= startX; i--){
				if((posX - j >= startX) && (posY + j <= endY)){
					if (board[posX][posY] == ico && board[posX - j][posY + j] == ico) {
						sameCount++;
					} else if (sameCount != WIN_COUNT - 1) {
						sameCount = 0;
					}
					j++;
				}
			}			
		}