This class is similar to a Perl associative array (or hash). It can store a set of key-value pairs, neither of which can be null.
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Hashtable staff = new Hashtable();
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Employee harry = new Employee("Harry Hacker");
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staff.put( "987-98-9996", harry );
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Values are retrieved by indexing with a key. Like Vectors, Hashtables only store objects of type Object, so you must cast the result:
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steve = (Employee) staff.get("149-26-7355");
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If there is no entry, a null value is returned.
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Performance of the Hashtable can be affected by giving an initialCapacity and a loadFactor for reallocation.
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