Collections has always been a confusing topic, with hell lot of things which mix up and nothing comes out when you are finished reading the whole chapter. Please suggest some good book/site where collections conecepts can be understood easily.
I agree, I am also having trouble in getting the hold of all those hash... methods. I don't have any experience of using collections and I just got 5 correct out of 16 questions in the self test. I think its better to learn collections from a basic book and practice some coding, then revisit this chapter again.