user2057847 user2057847 - 27 days ago 21
Java Question

Initialize Values of 2D Array using Nested For Loops

I am trying to format an array that is the following:

[1] [2] [3] [4] [5]
[6] [7] [8] [9] [10]
[11] [12] [13] [14] [15]


How could I initialize the two dimensional array and the values using nested for loops?

Answer

I think you have a misunderstanding of two dimensional arrays. Think of them beeing arrays containing arrays.

if you really want this:

[[1] [2] [3] [4] [5]
[6] [7] [8] [9] [10]
[11] [12] [13] [14] [15]]

You could initialize it like that:

int[][] array2d = new int[15][1]
for (int i = 0; i < array2d.length; i++) {
    array2d[i][0] = i + 1;
}

If in fatc, what you really want is:

[[1, 2, 3, 4, 5]
[6, 7, 8, 9, 10]
[11, 12, 13, 14, 15]]

you could use:

int[][] array2d = new int[3][5]
for (int i = 0; i < array2d.length; i++) {
    for (int j = 0; j < array2d[0].length; j++) {
        array2d[i][j] = (i * array2d[0].length) + j + 1;
    }
}
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