Java Collections Framework Tutorial

The Java Collections Framework (JCF) is a set of classes and interfaces that implement commonly reusable collection data structures. It provides a ready-made architecture for storing and manipulating a group of objects.

What does the Collection Framework contain?

  • Interfaces: They are abstract data types that represent collections. E.g., `Collection`, `List`, `Set`, `Map`, etc.
  • Classes: They are concrete implementations of the collection interfaces. E.g., `ArrayList`, `LinkedList`, `HashSet`, `HashMap`, etc.
  • Algorithms: They are the methods that perform useful computations, such as `searching` and `sorting`, on objects that implement collection interfaces.

Benefits of Java Collections Framework

  • Reduces programming effort: By providing useful data structures and algorithms, the JCF frees you to concentrate on the important parts of your program rather than on the low-level "plumbing" required to make it work.
  • Increases program speed and quality: This collections framework provides high-performance, high-quality implementations of useful data structures and algorithms.
  • Allows interoperability among unrelated APIs: The collection interfaces are the vernacular by which APIs pass collections back and forth.
  • Reduces effort to design and learn new APIs.
  • Reduces effort to design and learn new APIs.
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