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are very powerful and perform a wide range of functions
defines a means to retrieve successive elements from a data structure.
the BitSet class
implements a group of bits or flags that can be set and cleared individually
the Vector class
similar to a traditional Java array, except that it can grow as necessary to accommodate new elements.
the Stack class
implements a last-in-first-out (LIFO) stack of elements
the Dictionary class
an abstract class that defines a data structure for mapping keys to values.
the Hashtable class
provides a means of organizing data based on some user-defined key structure.
properties is a subclass of Hashtable
used to maintain lists of values in which the key is a String and the value is also a String.