[java] Help with Connect 4

/** * File: Connect4Processor.java *  * Version 1.0 *  * Revisions: *  1.1 Initial Revision from Gamedev.net post * 	1.2 Fixed problems with output and board storage. */package gdnetfixes;import java.io.BufferedReader;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;import java.util.ArrayList;/** * A connect 4 game that uses input files to specify a players sequence of moves * extended to multiple players current only one player and the input file is * hard-coded to be named test.txt and must be in the same directory as this  * game is being run from.  */public class Connect4Processor {		//all the moves to be made by a particular player.    private ArrayList moves = new ArrayList();        //Two dimensional array representing the board.    private int board[][] = new int[6][5]; //columns by rows        /**     * Empty Constructor, does nothing.     */    public Connect4Processor() {    	//empty constructor. Could call startup().    }    /**     * Creates and initializes the game as well as reads in all the moves     * by each of the players.      *      * @throws IOException Thrown if there is an error reading the input files.     */    public void startup() throws IOException {        BufferedReader in = new BufferedReader(         						new FileReader(new File("test.txt")) );        //Scanner in2 = new Scanner(new File("test2.txt"));        //Scanner in3 = new Scanner(new File("test3.txt"));        System.out.println(                "Please insert the name of the file you would like to input");        String strln = null;        while ( (strln = in.readLine()) != null ) {            moves.add(strln);        }        in.close();        //in2.close();        //in3.close();        // System.out.println("0123456");//prints out the game board        initBoard();    }        /**     * We need to make sure that all locations on the board are set to -1 in      * order to check for empty spaces when a move occurs.     */    public void initBoard() {    	for( int c = 0; c < board.length; c++ ) {    		for( int r = 0; r < board[c].length; r++ ) {    			board[c][r] = -1; //make sure all numbers are set to -1    		}    	}    }    /**     * It is easier to display a board if we have a 2D array. We simply iterate     * through each rows and print the integer or if it is empty (or equals -1)     * then we want to print a blankspace.     */    public void displayBoard() {        System.out.println("");        System.out.println("0123456");            //loop through the board by rows.        for( int r = 0; r < board[0].length; r++ ) {        	for( int c = 0; c < board.length; c++ ) {        		if( board[c][r] == -1 ) {        			System.out.print(" ");        		}else{        			System.out.print(board[c][r]);        		}        	}        	        	//the last column is reached so move to the next line.        	System.out.print("\n");        }                System.out.println();    }    /**     * This method loops through each move and plays the move. This method     * should be responsible for maintaining players and checking to see if     * the game is in a win state if so then it should display a notice of who     * one and exit the game loop. Or simply exit when all moves have been      * preformed.      */    public void playGame() {    	    	int player = 1;    	        for (int i = 0; i < moves.size(); i++) {        	//make the next move        	int move = Integer.parseInt((String) moves.get(i));        	        	if( !move( move, player ) ) {        		//the column was full        		System.out.println("Column " + move + " is full!");        	}        	        	//now print the board.        	displayBoard();        }                System.out.println("Game Over!");    }        /**     * Places a players piece on the game board by checking all the pieces in      * the column starting with the bottom most piece and then places a piece     * with the players number in the first empty location.      *      * @param column The column the player wishes to slide a piece to.     * @param player The number of the player who is currently moving.     */    public boolean move( int column, int player ) {     	    	//move is the column number so we know that now find next empty row    	//iterating up from the bottom of the board.    	for( int i = board[column].length-1; i >= 0; i--) {    		    		//if the spot on the board is empty    		if( board[column] == -1 ) {        		// you can place a piece    			board[column] = player;    			return true;    		}    	}    	    	return false; //the column is full.    }    /**     * The main entry point for the game. This method recieves command line      * arguments in the array of strings args. Creates a new Connect4Processor     * and initializes it and plays the game.      *      * @param args Variable array of command line arguments     * @throws IOException Thrown by Connect4Processor if a file error occurs.     */    public static void main(String[] args) throws IOException {        Connect4Processor c4p = new Connect4Processor();        c4p.startup();        c4p.playGame();    }    } //end Connect4Processor class