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Java SequencedCollection for Ordered Data Structures: SequencedList, SequencedSet, and SequencedDeque
Learn how Java 21’s SequencedCollection simplifies working with ordered data structures. See how it enhances List, Deque, and Set with examples.
3 min readFeb 26, 2025
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🚀 Introduction: Why SequencedCollection in Java 21?
Before Java 21, working with ordered data structures required different methods for accessing the first and last elements.
For example:
List→list.get(0),list.get(list.size() - 1)Deque→deque.getFirst(),deque.getLast()Set(e.g.,LinkedHashSet) → No direct way to get the first/last element
💡 Java 21 introduces SequencedCollection, a new interface that provides consistent methods for handling ordered data structures.
