What multithreaded collections do you know?

In Java, for example, multi-threaded collections include classes from the java.util.concurrent package, which provide thread safety when working from multiple threads without the need for external synchronization.

Main multi-threaded collections:

• ConcurrentHashMap — a thread-safe implementation of a hash table.
• CopyOnWriteArrayList — a list optimized for frequent reads and infrequent modifications.
• ConcurrentLinkedQueue — a non-blocking queue based on a linked list.
• BlockingQueue (e.g., ArrayBlockingQueue, LinkedBlockingQueue) — queues with blocking operations for thread interaction.
• ConcurrentSkipListMap and ConcurrentSkipListSet — thread-safe sorted collections.

Example of using ConcurrentHashMap:

ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>();
map.put("key1", 1);
Integer value = map.get("key1");

These collections help avoid synchronization issues and improve the performance of multi-threaded applications.