copying column of a 2D array as 1D array in java?

Question

Let's say I have a 2D array:

int[][] a = new int[4][3];

populated such that:

1 2 3
4 5 6
7 8 9
2 5 7

Is there any shortcut method in java to extract lets say column 1 as single array:

array1 = {1 4 7 2};

Currently what I am doing is traversing through the whole 2D matrix and with if condition (if j==0), I traverse over the rows and add values to 1D array.
Just wondering if there is any standard method offered in java for such tasks.

Answer 1

No there is no shortcut to doing this. You have to loop over the arrays, switching the x & y indices.