Connect4 Game

How this game is playe can be found at here.

1  1 public class Connect4 {
2  2     char[][] board = new char[6][7];
3  3 
4  4     public Connect4(char[][] board) {
5  5         this.board = board;
6  6     }
7  7 
8  8     public static void main(String[] args) {
9  9         Connect4 game = new Connect4(new char[6][7]);
10 10         game.fillBoard(' ');
11 11         Scanner input = new Scanner(System.in);
12 12         char player = 'X';
13 13         while (true) {
14 14             game.showGameBoard();
15 15             System.out.print("Player " + player + ", please enter the column where you'd like to drop your piece: ");
16 16             int col = input.nextInt();
17 17             if (game.tryDropPiece(col, player)) {
18 18                 if (game.checkForWin()) {
19 19                     System.out.println("Player " + player + " wins!");
20 20                     game.showGameBoard();
21 21                     return;
22 22                 }
23 23                 player = game.switchPlayer(player); // Switch players
24 24             }
25 25         }
26 26     }
27 27 
28 28     public char[][] fillBoard(char myChar) {
29 29         for (int row = 0; row < board.length; row++) {
30 30             Arrays.fill(board[row], 0, board[row].length, myChar);
31 31         }
32 32         return board;
33 33     }
34 34 
35 35     public void showGameBoard() {
36 36         System.out.println();
37 37         for (int row = 0; row < board.length; row++) {
38 38             System.out.print("|");
39 39             for (int col = 0; col < board[row].length; col++) {
40 40                 System.out.print(" " + board[row][col] + " |");
41 41             }
42 42             System.out.println();
43 43         }
44 44     }
45 45 
46 46     public boolean tryDropPiece(int col, char player) {
47 47         if (board[0][col] != ' ') {
48 48             System.out.println("That column is already full.");
49 49             return false;
50 50         }
51 51         for (int row = board.length - 1; row >= 0; row--) {
52 52             if (board[row][col] == ' ') {
53 53                 board[row][col] = player;
54 54                 return true;
55 55             }
56 56         }
57 57         return false;
58 58     }
59 59 
60 60     public boolean checkForWin() {
61 61         boolean result = false;
62 62         // Check for win horizontally
63 63         for (int row = 0; row < board.length; row++) {
64 64             for (int col = 0; col < board[row].length - 3; col++) {
65 65                 if (board[row][col] != ' ' && board[row][col] == board[row][col + 1]
66 66                         && board[row][col] == board[row][col + 2] && board[row][col] == board[row][col + 3]) {
67 67                     return true;
68 68                 }
69 69             }
70 70         }
71 71         // Check for win vertically
72 72         for (int col = 0; col < board[0].length; col++) {
73 73             for (int row = 0; row < board.length - 3; row++) {
74 74                 if (board[row][col] != ' ' && board[row][col] == board[row + 1][col]
75 75                         && board[row][col] == board[row + 2][col] && board[row][col] == board[row + 3][col]) {
76 76                     return true;
77 77                 }
78 78             }
79 79         }
80 80 
81 81         // Check for win diagonally, from top left
82 82         for (int row = 0; row < board.length - 3; row++) {
83 83             for (int col = 0; col < board[row].length - 3; col++) {
84 84                 if (board[row][col] != ' ' && board[row][col] == board[row + 1][col + 1]
85 85                         && board[row][col] == board[row + 2][col + 2] && board[row][col] == board[row + 3][col + 3]) {
86 86                     return true;
87 87                 }
88 88             }
89 89         }
90 90 
91 91         // Check for win diagonally, from top right
92 92         for (int row = 0; row < board.length - 3; row++) {
93 93             for (int col = 3; col < board[row].length; col++) {
94 94                 if (board[row][col] != ' ' && board[row][col] == board[row + 1][col - 1]
95 95                         && board[row][col] == board[row + 2][col - 2] && board[row][col] == board[row + 3][col - 3]) {
96 96                     return true;
97 97                 }
98 98             }
99 99         }
100100         return false;
101101 
102102     }
103103 
104104     public char switchPlayer(char currentPlayer) {
105105         if (currentPlayer == 'X') {
106106             return 'O';
107107         } else {
108108             return 'X';
109109         }
110110     }
111111 }