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Version History:

 1.0 1998-01-01 initial version

 1.1 1998-11-10 add name and address.

 1.2 1998-12-28 JDK 1.2 style Comparator

 1.3 2002-02-19 java.util.Comparator by default.

 1.4 2002-03-30 tidy code.

 1.5 2003-05-30 add dummy private constructor

 1.6 2008-01-01 add generics to comparator

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