B4J Question Optimal way to store Arrays as CSV?

I do not have enough experience with B4J.

I am currently saving a list of arrays having multiple string items as a CSV like this:
1. Iterate over the list having arrays
2. Read array elements one by one
3. Create a string with array elements and commas in between
4. Add that string to new list
5. Save the new list using file.writelist

Would like to know if that is the optimal method or there can be a better way ?

Thanks!