Expertise in Java collection API

Hi Folks,

I am an amateur in Java Collection API, I can try to understand collection API, but somehow I am having trouble mastering it. Especially the hash maps. Is there any better way to master by doing some exercises. Any suggestions would be appreciated.
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Mark BullockQA EngineerCommented:
Here is a pretty recent Java programming course. Section 10.3 has an explanation of HashMap and compares it with TreeMap. It has exercises and a quiz. The best way to learn something about programming is to write code and debug it.

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kalyangkmAuthor Commented:
Hi Mark,

Thanks. Please send me some more of such websites or exercises.
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