links que voy mirando

http://codeofdoom.com/wordpress/2009/03/29/rebuilding-vs-refactoring/
http://www.javaworld.com/javaworld/jw-08-2003/jw-0801-toolbox.html
http://theknowledge.me.uk/mywiki/books/refactoring-improving-the-design-of-existing-code.html#Chapter_10_Making_Method_Calls_Better
http://www.javaworld.com/javaworld/javaqa/2001-04/03-qa-0420-abstract.htm
http://codeofdoom.com/wordpress/2009/02/12/learn-this-when-to-use-an-abstract-class-and-an-interface/
http://codeofdoom.com/wordpress/2009/02/04/the-importance-of-composition/
http://geekswithblogs.net/mahesh/archive/2006/07/05/84120.aspx
http://en.wikipedia.org/wiki/Law_of_Demeter
http://haacked.com/archive/2009/07/14/law-of-demeter-dot-counting.aspx
http://qconlondon.com/london-2009/presentation/Null+References:+The+Billion+Dollar+Mistake