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Collections

Core data structures, performance characteristics, and concurrent collections.

More on Collections

ArrayList vs LinkedList

Performance tradeoffs and when to choose each.

Concurrent Collections

Using ConcurrentHashMap and other thread-safe collections.

Collections Overview

The Java Collections Framework provides standard data structures like lists, sets, and maps. Understanding their performance characteristics is essential for choosing the right data structure for a task.

Key Areas

  • List vs Set vs Map semantics
  • ArrayList vs LinkedList performance tradeoffs
  • Concurrent collections: ConcurrentHashMap, CopyOnWriteArrayList

Recommended: profile common operations (add/remove/iterate) and prefer concurrent collections for thread-safe access.