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Java has long been a popular programming language, known for its versatility and robust standard library. With the release of Java 21, developers have gained access to a powerful new interface: SequenceCollection. This interface extends the capabilities of Java collections, offering enhanced control over ordered collections with a well-defined encounter order. In this article, we will explore the features of the SequenceCollection interface, including new methods like addFirst, addLast, getFirst, getLast, removeFirst, removeLast, and reversed, and discuss how they empower developers to manage ordered data efficiently. Understanding the SequenceCollection Interface The SequenceCollection interface is defined in Java 21 as a collection that has a well-defined encounter order, supports operations at both ends and is reversible. This encounter order is a fundamental concept in this interface, where elements are conceptually arranged linearly from the first element to the last element. While this definition doesn't imply anything about the physical positioning of elements, it provides a clear ordering for developers to work with.