slidingString

Returns sliding windows of the given size over the list.

Example:

    // list = ["a", "b", "c", "d"]
    var windows = Lists.slidingString (list, 2);
    // [["a","b"], ["b","c"], ["c","d"]]

Parameters:

list	the source list.
windowSize	the window size (must be > 0, otherwise empty result).

Returns:

an ArrayList of window lists.