C++ STL Data Structure	Java Equivalent	Description
std::vector	ArrayList	Dynamic array that can resize itself.
std::list	LinkedList	Doubly-linked list.
std::deque	ArrayDeque	Double-ended queue (deque) that supports insertion/removal at both ends.
std::stack	Stack	LIFO (Last-In-First-Out) stack.
std::queue	Queue (interface)	FIFO (First-In-First-Out) queue. Commonly implemented with LinkedList.
std::priority_queue	PriorityQueue	Priority queue (heap) where elements are ordered by priority.
std::set	TreeSet	Sorted set implemented as a balanced binary search tree (Red-Black Tree).
std::multiset	No direct equivalent	Sorted multiset (allows duplicates). Can be emulated with TreeMap<Integer, Integer>.
std::map	TreeMap	Sorted map implemented as a balanced binary search tree (Red-Black Tree).
std::multimap	No direct equivalent	Sorted multimap (allows duplicate keys). Can be emulated with TreeMap<K, List<V>>.
std::unordered_set	HashSet	Hash table-based set.
std::unordered_map	HashMap	Hash table-based map.
std::unordered_multiset	No direct equivalent	Hash table-based multiset (allows duplicates). Can be emulated with HashMap<K, Integer>.
std::unordered_multimap	No direct equivalent	Hash table-based multimap (allows duplicate keys). Can be emulated with HashMap<K, List<V>>.
std::pair	AbstractMap.SimpleEntry	A pair of two elements.

Notes:

1. Java Collections Framework: Java provides a rich set of data structures through its Collections Framework, which is similar to C++ STL but with some differences in implementation and naming.
2. No Direct Equivalents: Some C++ STL data structures (e.g., multiset, multimap) do not have direct equivalents in Java. However, they can be emulated using combinations of other data structures.
3. Thread Safety: Java provides thread-safe versions of some data structures (e.g., Vector, Hashtable, ConcurrentHashMap), whereas C++ STL data structures are not thread-safe by default.

Example: Replacement for std::vector in Java

• C++: std::vector<int> v;
• Java: ArrayList<Integer> list = new ArrayList<>();