The Ultimate Guide to Java Collections Framework [in 2023]

java-collections-overview.md

The Ultimate Guide to Java Collections Framework [in 2023]

Collection	Interface	Ordered	Sorted	Thread safe	Duplicate	Nullable
ArrayList	List	Yes	No	No	Yes	Yes
Vector	List	Yes	No	Yes	Yes	Yes
LinkedList	List, Deque	Yes	No	No	Yes	Yes
CopyOnWriteArrayList	List	Yes	_No	Yes	Yes	Yes
HashSet	Set	No	No	No	No	One null
LinkedHashSet	Set	Yes	No	No	No	One null
TreeSet	Set	Yes	Yes	No	No	No
CopyOnWriteArraySet	Set	Yes	No	Yes	No	One null
ConcurrentSkipListSet	Set	Yes	Yes	Yes	No	No
HashMap	Map	No	No	No	No (key)	One null (key)
HashTable	Map	No	No	Yes	No (key)	No (key)
LinkedHashMap	Map	Yes	No	No	No (key)	One null (key)
TreeMap	Map	Yes	Yes	No	No (key)	No (key)
ConcurrentHashMap	Map	No	No	Yes	No (key)	No
ConcurrentSkipListMap	Map	Yes	Yes	Yes	No (key)	No
ArrayDeque	Deque	Yes	No	No	Yes	No
PriorityQueue	Queue	Yes	No	No	Yes	No
ConcurrentLinkedQueue	Queue	Yes	No	Yes	Yes	No
ConcurrentLinkedDeque	Deque	Yes	No	Yes	Yes	No
ArrayBlockingQueue	Queue	Yes	No	Yes	Yes	No
LinkedBlockingDeque	Deque	Yes	No	Yes	Yes	No
PriorityBlockingQueue	Queue	Yes	No	Yes	Yes	No