Sanmoku.java

import java.util.Scanner;


class Sanmoku {
    private int[][] ban;
    private static final int N = 3;

    Sanmoku() {
        ban = new int[N][N];
    }

    public void mainLoop() {
        Scanner sc = new Scanner(System.in);
        int x;
        int y;
        boolean phase = true;

        while (true) {
            if (phase)
                System.out.println("phase : O");
            else
                System.out.println("phase : X");

            try {
                System.out.print("put (vertical axis):");
                y = sc.nextInt();
                System.out.print("put (horizontal axis):");
                x = sc.nextInt();
            } catch (NumberFormatException e) {
                System.out.println("Wrong input");
                continue;
            }

            if (x < 0 || x > 2 || y < 0 || y > 2) {
                System.out.println("Wrong input");
                continue;
            }

            if (ban[y][x] != 0) {
                System.out.println("Already exsits");
                continue;
            }

            if (phase) {
                ban[y][x] = 1;
                phase = false;
            } else {
                ban[y][x] = 2;
                phase = true;
            }

            printBan();

            int result = checkWin();
            if (result == 0)
                continue;
            else if (result == 1) {
                System.out.println("Winner: O");
                break;
            } else if (result == 2) {
                System.out.println("Winner: X");
                break;
            }

        }
    }

    private int checkWin() {
        for (int i = 0; i < N; i++) {
            for (int j = 1; j <= 2; j++) {
                if (ban[i][0] == j && ban[i][1] == j && ban[i][2] == j)
                    return j;
                if (ban[0][i] == j && ban[1][i] == j && ban[2][i] == j)
                    return j;
                if (ban[0][0] == j && ban[1][1] == j && ban[2][2] == j)
                    return j;
                if (ban[0][2] == j && ban[1][1] == j && ban[2][0] == j)
                    return j;
            }
        }
        return 0;
    }

    private void printBan() {
        String banmen = "  012  \n" +
                        " +---+ \n";
        for (int i = 0; i < N; i++) {
            banmen += i + "|";
            for (int j = 0; j < N;  j++) {
                assert 0 <= ban[i][j] && ban[i][j] < 3 :
                    "0 <= ban[i][j] < 3 expected, but " + ban[i][j];

                if (ban[i][j] == 0)
                    banmen += " ";
                else if (ban[i][j] == 1)
                    banmen += "O";
                else if (ban[i][j] == 2)
                    banmen += "X";
            }
            banmen += "|\n";
        }
        banmen += " +---+";
        System.out.println(banmen);
    }

    public static void main(String[] args) {
        Sanmoku sanmoku = new Sanmoku();
        sanmoku.mainLoop();
    }
}