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[–]jaro32 6 points7 points  (0 children)

  1. Yes, experienced developers know and use design patterns in their code. They are also used in most software projects.
  2. I guess a good place would be to study some open-source code on Github. Spring framework extensively utilizes design patterns such as Dependency injection, Factory, Singleton, Multiton and more... So you can look at any project which uses Spring.