This was a nice refresher for someone (me) who hasn't done Java in a while. What I had most difficult with Java was to understand the purpose of interfaces. They are so obvious to me now, but back when I learned about it (and abstract classes) I felt like giving up on coding all-together. That was when I checked out Head First Java and it's like that sometimes, that you need a different way to understand a concept.
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This was a nice refresher for someone (me) who hasn't done Java in a while. What I had most difficult with Java was to understand the purpose of interfaces. They are so obvious to me now, but back when I learned about it (and abstract classes) I felt like giving up on coding all-together. That was when I checked out Head First Java and it's like that sometimes, that you need a different way to understand a concept.