JUC Concurrent Collections Overview: List, Set, Map, and Queue

The series "Big Data Path to God" aims to publish over 500 articles, with more than 40 already released, and invites readers to follow the evolving outline.

1. List and Set

The JUC (java.util.concurrent) package includes thread‑safe implementations such as CopyOnWriteArrayList , CopyOnWriteArraySet , and ConcurrentSkipListSet . CopyOnWriteArrayList functions like a thread‑safe ArrayList, supporting high concurrency, while CopyOnWriteArraySet behaves like a thread‑safe HashSet and internally uses a CopyOnWriteArrayList.

2. Map

ConcurrentMap implementations include ConcurrentHashMap and ConcurrentSkipListMap . ConcurrentHashMap provides a thread‑safe hash table (similar to a synchronized HashMap) using lock‑striping, while ConcurrentSkipListMap offers a thread‑safe ordered map (similar to TreeMap) based on a skip‑list.

3. Queue

The JUC package provides several concurrent queue implementations: ArrayBlockingQueue (bounded array‑based), LinkedBlockingQueue (bounded linked‑list FIFO), LinkedBlockingDeque (bounded double‑ended queue supporting FIFO and FILO), ConcurrentLinkedQueue (unbounded FIFO), and ConcurrentLinkedDeque (unbounded double‑ended queue supporting both FIFO and FILO).

Follow the QR code to stay updated on the "Big Data Path to God" series, guiding readers from beginner to expert.