HELP!! NullPointerException - code won't compile

[JuliaDavies]

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) {
super(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.length);
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
Julia

[Tolls]

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.

[DarrylBurke]

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

db