Collections. As you can see there is a trend, starting with basic programming knowledge and working up to more intermediate/advanced concepts. How to Hashmaps work, List - ArrayList vs LinkedList. When is it appropriate to use a particular data structure. How do they work, what kind of overhead is involved with maintaining them. Overriding object equals/comparators and how to apply those concepts to collections in Java.

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Collections. As you can see there is a trend, starting with basic programming knowledge and working up to more intermediate/advanced concepts. How to Hashmaps work, List -> ArrayList vs LinkedList. When is it appropriate to use a particular data structure. How do they work, what kind of overhead is involved with maintaining them. Overriding object equals/comparators and how to apply those concepts to collections in Java.

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