CODEWITHSUNDEEP
javaarraysfilebufferedreader
karpiu08
karpiu08

Reputation: 35

Reading 2d array from file using BufferedReader in java

I'm trying to load file, which looks like this:

0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0

to 2d array, which is in class sudokuboard.

The function, which i use for this is following:

 @Override
public SudokuBoard read() throws DaoException {

    SudokuBoard board = new SudokuBoard();

    try {
        BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(fileName)));

        while (in.ready() == true) {

            for (int row = 0; row < 9; row++) {
                for (int column = 0; column < 9; column++) {

                    board.setDigit(row, column, in.read());

                    //System.out.print(in.read() + ", ");
                }
                in.read(); // this is important

                System.out.println("");
            }
        }
    } catch (IOException e) {
        throw new DaoException(DaoException.IO_EXCEPTION, e);
    }
    return board;

}

What i have after reading this file is:

0 0 0 6 115 113 0 126 0 
0 0 0 4 115 113 0 126 0 
0 0 0 2 115 113 0 126 0 
0 0 0 3 115 113 0 126 0 
0 0 0 8 115 113 0 126 0 
0 0 0 5 115 113 0 126 0 
0 0 0 1 115 113 0 126 0 
0 0 0 9 120 120 -1 -1 -1 
-1 -1 -1 -1 -1 -1 -1 -1 -1

Anybody knows where the problem is ?

Thanks for help !

Upvotes: 1

Views: 5899

Answers (2)

Rod
Rod

Reputation: 49

I've been playing with your code a bit. And this is what I came up with. Surely, there are better solutions, but I think this one will work for you.

BufferedReader in = null;
try {
    in = new BufferedReader(new InputStreamReader(new FileInputStream("C:/Users/Rod/Desktop/123.txt")));
    int column = 0;
    int row = 0;
    int pom;
    while ((pom = in.read()) != -1) {
        pom -= 48;
        if (pom > -1 && pom < 10) {
            System.out.print("" + pom + ", ");
            // board.setDigit(row, column, pom);
            column++;
            if (column > 8) {
                column = 0;
                System.out.println("");
                row++;
                if (row > 8)
                    break;
            }
        }
    }

} catch (Exception e) {
    System.out.print("ERROR");
    // e.printStackTrace();
} finally {
    if (in != null)
        in.close();
}

Tell me did it worked well for you.

P.S. I've edited code after comments. All the best.

Upvotes: 0

Alessandro Suglia
Alessandro Suglia

Reputation: 1927

What do you think about this solution?

public static int[][] readBoard(String boardFileName) throws IOException {
    int[][] board = new int[9][9];

    BufferedReader reader = null;

    try {
        reader = new BufferedReader(new FileReader(boardFileName));

        for(int i = 0; i < 9 && reader.ready(); i++) {
            String[] splittedRow = reader.readLine().split(" "); // split using the space character
            for(int j = 0; j < 9; j++) {
                board[i][j] = Integer.parseInt(splittedRow[j]);
            }
        }

        return board;

    } catch(IOException e) {
        throw e; // lets the caller manage the exception
    } finally {
        assert reader != null;
        reader.close();
    }
}

Obviously, don't take care about the error management that is completely absent :)

I hope that this code will help you...

Upvotes: 1

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