I have a requirement wherein i should write a method of type `String[]` and return the same.But the implementation that i have, uses and returns `List<List<String>>`.Also the `List<List<String>>` gets and returns values from the database and the values are not known prior to add them to the `String[]` directly.The list can also be of a huge size to accomodate it in an `String[]` . How to get this conversion done.