Hash

Does not have an order. It's an random order

LinkedHash

Orders by inplemented order.

Tree

Orders by the actual values of the elements.

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Set

Do not accept duplication.
ex)TreeSet, HashSet, LinkedHashSet

Queue

It has a queue, and the first element is affected by the operation
ex)PriorityQueue

Map

It has a <key,value>.
ex)HashMap, LinkedHashMap, TreeMap

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New collections to me!