Rahul.p Kumar wrote: . . . sth . . .
For reasons explained
here, please avoid that sort of abbreviation. People who didn't learn English as a first language won't understand that, least of all after you said "nth" and "mth".
Java doesn't support 2-Dimensional arrays. It supports arrays of arrays, which can be more versatile. For example your array of arrays can include differently sized arrays, or even an empty array, as its elements.