还是TicTacToe 2.0

　　基本内容已经搞定了，AI明天写。

　　1.0的AI就是完全靠随机，只要玩家先走，电脑就基本没机会赢，这样就不叫游戏了，所以必须得改进。

public class Game {
    String chessBoard;
    String[][] pieces = new String[3][3];
    
    /** 初始化棋盘样式和棋子数组。*/
    public Game() {
        chessBoard = 
                "--------------   
" +
                "| %s | %s | %s | 
" +
                "--------------   
" +
                "| %s | %s | %s | 
" +
                "--------------   
" +
                "| %s | %s | %s | 
" +
                "--------------   
";
        
        for (String[] s1: pieces) {
            for (int i = 0; i < s1.length; i++)
                s1[i] = " ";
        }
    }
    
    /** 在棋盘上落子。*/
    int changeBoard(int row, int column, String chessMan) {
        if (this.pieces[row][column] == " ") {
            this.pieces[row][column] = chessMan;
            return 1;
        }
        return -1;
    }
    
    /** 棋子数组降维。*/
    String[] pieceList() {
        String[] temp = new String[9];
        for (int i = 0, j = 0; i < 3; i++, j += 3)
            System.arraycopy(this.pieces[i], 0, temp, j, 3);
        return temp;
    }
    
    /** 打印棋盘。*/
    void printChessBoard() {
        System.out.printf(this.chessBoard, (Object[])this.pieceList());
    }
    
    /** 判断平局。*/
    boolean isFilled() {
        for (String[] s1: this.pieces) {
            for (String s2: s1) {
                if (s2 == " ")
                    return false;
            }
        }
        return true;
    }
    /** 判断胜利。*/
    boolean checkWin() {
        for (int i = 0; i < 3; i++) {
            if ((this.pieces[i][0] == this.pieces[i][1] && 
                this.pieces[i][1] == this.pieces[i][2] && 
                this.pieces[i][1] != " ")
                ||
                (this.pieces[0][i] == this.pieces[1][i] && 
                this.pieces[1][i] == this.pieces[2][i] &&
                this.pieces[1][i] != " "))
                return true;
        }
        if ((this.pieces[0][0] == this.pieces[1][1] &&
            this.pieces[1][1] == this.pieces[2][2] &&
            this.pieces[1][1] != " ")
            ||
            (this.pieces[2][0] == this.pieces[1][1] &&
            this.pieces[1][1] == this.pieces[0][2] &&
            this.pieces[1][1] != " "))
            return true;
        
        return false;
    }
}

public class Player {
    
    /** 玩家落子。*/
    void move(Game game) {
        
        while (true) {
            java.util.Scanner input = new java.util.Scanner(System.in);
            
            System.out.print("请输入行数(1-3):");
            String row = input.next();
            if (!isValid(row))
                continue;
            System.out.print("请输入列数(1-3):");
            String column = input.next();
            if (!isValid(column))
                continue;
            
            int r = Integer.parseInt(row) - 1;
            int c = Integer.parseInt(column) - 1;
            
            if (game.changeBoard(r, c, "○") == -1) {
                System.out.println("这里有子了。
");
                continue;
            }
            
            return;
        }
    }
    
    /** 检查玩家输入。*/
    boolean isValid(String userInput) {
        if (userInput.matches("[123]{1}"))
            return true;
        else
            return false;
    }
}

public class Computer {
    
    /** 电脑落子。*/
    void move(Game game) {
        int row, column;
        
        while (true) {
            row = (int) (Math.random() * 3);
            column = (int) (Math.random() * 3);
            if (game.changeBoard(row, column, "×") == -1)
                continue;
            break;
        }
    }
    
    /** 找出并返回棋盘上的关键点。*/
    boolean hasCriticalPoint(Game game) {
        return false;
    }
}

public class Run {
    public static void main(String[] args) {
        Game game = new Game();
        Player player = new Player();
        Computer computer = new Computer();
        
        while (true) {
            game.printChessBoard();
            
            player.move(game);
            System.out.println();
            if (game.checkWin()) {
                game.printChessBoard();
                System.out.println("你赢了!!!!!!!赢了啊啊啊啊啊啊啊啊啊啊啊啊！！！！");
                break;
            }
            if (game.isFilled()) {
                game.printChessBoard();
                System.out.println("平局了。");
                break;
            }
            computer.move(game);
            if (game.checkWin()) {
                game.printChessBoard();
                System.out.println("电脑赢了!!!!!!!赢了啊啊啊啊啊啊啊啊啊啊啊啊！！！！");
                break;
            }
            if (game.isFilled()) {
                game.printChessBoard();
                System.out.println("平局了。");
                break;
            }
                
            System.out.println();
        }
    }
    
    public static void trace(String toShow) {
        System.out.printf("===Trace:%s===
", toShow);
    }
}