Trouble populating 2d array

Question

I'm trying to populate a 2d array in java for a sudoku board. The numbers come from a csv file. The issue is the code just reads the first four numbers, then restarts at 0 again for a new row. How do I stop this from happening, and get it to continue to the end of the numbers?

    String[] lines = Cell.toCSV().split(",");
    int[] intArray = new int[lines.length];

    for (int i = 0; i < intArray.length; i++) {
        intArray[i] = Integer.parseInt(lines[i]);
    } //convert string to int

    int[][] dataArray = new int[4][4]; //4x4 sudoku game

    for (int col = 0; col < size; col++) {
        for (int row = 0; row < dataArray[col].length; row++) {
            dataArray[col][row] = intArray[row];
    }

Eran · Accepted Answer · 2016-04-08 02:02:50Z

1

You need a separate counter for the original array :

int index = 0;
for (int col = 0; col < dataArray.length; col++) {
    for (int row = 0; row < dataArray[col].length; row++) {
        dataArray[col][row] = intArray[index++];
}

This is assuming the intArray has enough values to populate the 2D array. You should probably validate that prior to this loop.

BTW, the first dimension of a 2D array is usually considered as the row, not the column, so your loop variable names are a bit confusing.

answered Apr 8, 2016 at 2:02

Eran

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1 Comment

snazzyjazzy Over a year ago

Thanks, that was the solution :)

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