This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I presume it does, if the compiler doesn't complain. May I attempt to answer your other question by pointing out that (unlike arrays), when you insert something into a Vector, the index of all entries after the inserted entry gets increased by 1? I found it hard to get that right when I tried sorting-like activities on Lists.