Quick Answer
Java Collections Framework provides reusable data structures. Core interfaces: List (ordered, allows duplicates), Set (no duplicates), Map (key-value pairs), Queue (FIFO), Deque (double-ended). Common implementations: ArrayList, LinkedList, HashSet, TreeSet, HashMap, TreeMap. Prefer List/Map/Set interfaces in variable types for flexibility. Use Collections utility class for sorting, searching, and synchronizing.
Answer
Collections store groups of objects. Common types: List, Set, Map, Queue. Provide efficient searching, sorting, and manipulation.
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Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
