What are the main interfaces in the Collections Framework?

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The Java Collections Framework (JCF) provides a set of core interfaces that define different types of data structures and their behavior. The main interfaces are:

  1. Collection – Root interface for most collections; represents a group of objects. Subinterfaces:

    • List – Ordered collection, allows duplicates (e.g., ArrayList, LinkedList).

    • Set – Unordered, no duplicates (e.g., HashSet, LinkedHashSet).

    • Queue – Designed for holding elements before processing, follows FIFO or priority rules (e.g., PriorityQueue).

    • Deque – Double-ended queue allowing insertion/removal at both ends (e.g., ArrayDeque).

  2. Map – Key-value pairs, keys are unique (e.g., HashMap, TreeMap). Not a subinterface of Collection.

  3. SortedSet – A Set that maintains elements in sorted order (e.g., TreeSet).

  4. SortedMap – A Map with sorted keys (e.g., TreeMap).

These interfaces provide flexibility to work with different data structures and allow switching implementations without changing code logic.

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