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  1. #1
    JuliaDavies is offline Member
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    Mar 2012
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    Default HELP!! NullPointerException - code won't compile

    Hi, please can someone help me!
    My code won't compile and the error thrown is NullPointerException.
    The two lines of code it says are null are:

    public SwingSudokuBoard(int[][] board) {
    this(board.length); <-----THIS ONE
    for (int row = 0; row < size; row++) {
    for (int col = 0; col < size; col++) {
    setCell(board[row][col], row, col);

    public SwingSudokuBoard(int size) {
    cells = new TextField[size][size];
    panel.setLayout(new GridLayout(size, size));
    for (int row = 0; row < size; row++) {
    for (int col = 0; col < size; col++) {
    panel.add(cells[row][col]); <-----THIS ONE

    How do I make them not Null? Or please can anyone explain to me why they are being thrown as errors?
    I initialised panel here: private JPanel panel = new JPanel(); at the beginning of the class SwingSudokuBoard (which extends SudokuBoard)
    and I initialised board here:
    public SudokuBoard(int[][] board) {
    this.board = board;
    } in SudokuBoard class
    I initialised cells in the same method as above: cells = new TextField[size][size];

    Does length need to be initialised? Is this where I am going wrong?
    Thank you

  2. #2
    Tolls is offline Moderator
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    Apr 2009
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    Default Re: HELP!! NullPointerException - code won't compile

    You really do need to use [code] tags[/code].
    Which of those lines is the one throwing the exception.
    And, since this is a new thread, you ought to post the stack trace here.
    Please do not ask for code as refusal often offends.

    ** This space for rent **

  3. #3
    DarrylBurke's Avatar
    DarrylBurke is offline Forum Police
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    Sep 2008
    Madgaon, Goa, India
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    Default Re: HELP!! NullPointerException - code won't compile

    DOn't double post the same question. I'm closing this thread as the other one has more responses.

    If you're forever cleaning cobwebs, it's time to get rid of the spiders.

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