Java programming using ArrayList Help?

Hi,can anybody help and guide me on doing this java program? (Largest rows and columns)Write a program that randomly fills in 0s and 1s into an n-by-n matrix,prints the matrix,and finds the rows and columns with the most 1s.(HINT:Use two ArrayLists to store the row and column indices with the most 1s.

Here are the output required: Enter the array size n : 4 //input by user

The random array is

0011

0011

1101

1010

The largest row index : 2

The largest column index : 2,3

Any help would be greatly appreciated .