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This implements a dynamic array. It is similar to ArrayList, but with some differences.
Stack is a subclass of Vector that implements a standard last-in, first-out stack.
Dictionary is an abstract class that represents a key/value storage repository and operates much like Map.
Hashtable was part of the original java.util and is a concrete implementation of a Dictionary.
Properties is a subclass of Hashtable. It is used to maintain lists of values in which the key is a String and the value is also a String.
A BitSet class creates a special type of array that holds bit values. This array can increase in size as needed.