Web Reference: Sep 4, 2012 · Vector is another List, much like an ArrayList in that its implementation is based on a dynamic array; it's, however, a relic of the older versions of Java and is guaranteed to be thread-safe by being wholly synchronized. In practice, new Vector() is more-or-less equivalent to Collections.synchronizedList(new ArrayList()). Jul 21, 2014 · One more difference on Array vs ArrayList is that you can create instance of ArrayList without specifying size, Java will create Array List with default size but its mandatory to provide size of Array while creating either directly or indirectly by initializing Array while creating it. By the way you can also initialize ArrayList while creating it. May 12, 2014 · The ArrayList implementation uses an underlying array, but all accesses have to go through the get(), set(), remove(), etc. methods which means it goes through more code than a simple array access.
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