Bad Code Smells

"Have a look at this application and identify where we need to / better do refactoring"

Apart from understanding refactoring techniques, understanding code smells help identify where you need to apply the refactoring techniques. Main code smells are given below:

• Duplicated Code.
  
• Long Method.
  
• Large Class.
  
• Long Parameter List.
  
• Divergent Change.
  
• Shotgun Surgery.
  
• Feature Envy.
  
• Data Clumps.
  
• Primitive Obsession.
  
• Switch Statements.
  
• Parallel Inheritance Hierarchies.
  
• Lazy Class.
  
• Speculative Generality.
  
• Temporary Field.
  
• Message Chains.
  
• Middle Man.
  
• Inappropriate Intimacy.
  
• Alternative Classes with Different
  
• Interfaces.
  
• Incomplete Library Class.
  
• Data Class.
  
• Refused Bequest.
  
• Comments.
  

More info:

• http://en.wikipedia.org/wiki/Code_smell
  
• http://industriallogic.com/papers/smellstorefactorings.pdf
  
• http://www.soberit.hut.fi/mmantyla/BadCodeSmellsTaxonomy.htm
  
• http://c2.com/cgi/wiki?CodeSmell
  
• http://sourcemaking.com/antipatterns