Connect4 Game

How this game is playe can be found at here.

 public class Connect4 {
     char[][] board = new char[][];

     public Connect4(char[][] board) {
         this.board = board;
     }

     public static void main(String[] args) {
         Connect4 game = new Connect4(new char[][]);
         game.fillBoard(' ');
         Scanner input = new Scanner(System.in);
         char player = 'X';
         while (true) {
             game.showGameBoard();
             System.out.print("Player " + player + ", please enter the column where you'd like to drop your piece: ");
             int col = input.nextInt();
             if (game.tryDropPiece(col, player)) {
                 if (game.checkForWin()) {
                     System.out.println("Player " + player + " wins!");
                     game.showGameBoard();
                     return;
                 }
                 player = game.switchPlayer(player); // Switch players
             }
         }
     }

     public char[][] fillBoard(char myChar) {
         for (int row = ; row < board.length; row++) {
             Arrays.fill(board[row], , board[row].length, myChar);
         }
         return board;
     }

     public void showGameBoard() {
         System.out.println();
         for (int row = ; row < board.length; row++) {
             System.out.print("|");
             for (int col = ; col < board[row].length; col++) {
                 System.out.print(" " + board[row][col] + " |");
             }
             System.out.println();
         }
     }

     public boolean tryDropPiece(int col, char player) {
         if (board[][col] != ' ') {
             System.out.println("That column is already full.");
             return false;
         }
         for (int row = board.length - ; row >= ; row--) {
             if (board[row][col] == ' ') {
                 board[row][col] = player;
                 return true;
             }
         }
         return false;
     }

     public boolean checkForWin() {
         boolean result = false;
         // Check for win horizontally
         for (int row = ; row < board.length; row++) {
             for (int col = ; col < board[row].length - ; col++) {
                 if (board[row][col] != ' ' && board[row][col] == board[row][col + ]
                         && board[row][col] == board[row][col + ] && board[row][col] == board[row][col + ]) {
                     return true;
                 }
             }
         }
         // Check for win vertically
         for (int col = ; col < board[].length; col++) {
             for (int row = ; row < board.length - ; row++) {
                 if (board[row][col] != ' ' && board[row][col] == board[row + ][col]
                         && board[row][col] == board[row + ][col] && board[row][col] == board[row + ][col]) {
                     return true;
                 }
             }
         }

         // Check for win diagonally, from top left
         for (int row = ; row < board.length - ; row++) {
             for (int col = ; col < board[row].length - ; col++) {
                 if (board[row][col] != ' ' && board[row][col] == board[row + ][col + ]
                         && board[row][col] == board[row + ][col + ] && board[row][col] == board[row + ][col + ]) {
                     return true;
                 }
             }
         }

         // Check for win diagonally, from top right
         for (int row = ; row < board.length - ; row++) {
             for (int col = ; col < board[row].length; col++) {
                 if (board[row][col] != ' ' && board[row][col] == board[row + ][col - ]
                         && board[row][col] == board[row + ][col - ] && board[row][col] == board[row + ][col - ]) {
                     return true;
                 }
             }
         }
         return false;

     }

     public char switchPlayer(char currentPlayer) {
         if (currentPlayer == 'X') {
             return 'O';
         } else {
             return 'X';
         }
     }
 }