Java Collections Key usages and phrases

Java Collections Key usages & phrases 

ArrayList – orderd, fast iteration and fast random access.
LinkedList – orderd,fast insertion and deletion

HashSet – unsorted, unordered Set. no duplicates and you don’t care about order.
LinkedHashSet– orderd, Use this class instead of HashSet when you care about the iteration order.
TreeSet– Sorted set.

HashMap– unsorted, unordered. don’t care about the order.
LinkedHashMap– maintains insertion order (or, optionally, access order). slower than HashMap for adding and removing elements, you can expect faster iteration with a LinkedHashMap.
TreeMap – Sorted. TreeMap lets you pass your own comparison rules in when you construct