How to determine the length of the row and column of a two dimensional array?

For example:

I have the following code:

String[][] s = new String[3][2];

I understood, how to determine the length of the "row" like the following:

int i = s.length;

System.out.println(i);

This gives me length as 3.

But how do I determine the length of the "column" just like in above fashion? I want my answer to be 2 because it's length is 2.

Thanks