Answer Posted / punit pannu

collection API:- Collection is a interface which contains three sub-interfaces list set and queue sub-interfaces.

1.List sub-interface: it contains three concrete classes
Arraylist
Vector and
Linkedlist

2. Set sub-interface:- it contains two classes
HashSet
LinkedHashSet

and one interface- SortedSet which contains one concrete
class - TreeSet


3. Map interface: it contains three concrete classes
HashMap
HashTable
LinkedHashMap

and one sub-interface

SortedMap

which contains one concrete class

TreeMap.

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