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3 days ago · Learn about the Java Collection Framework, which provides a common interface and implementation for various data structures and algorithms. Explore the hierarchy, methods, and examples of the Collection interface and its subinterfaces and classes.
- 9 min
- Iterable Interface. The Iterable interface is the root interface for all the collection classes. The Collection interface extends the Iterable interface and therefore all the subclasses of Collection interface also implement the Iterable interface.
- Collection Interface. The Collection interface is the interface which is implemented by all the classes in the collection framework. It declares the methods that every collection will have.
- List Interface. List interface is the child interface of Collection interface. It inhibits a list type data structure in which we can store the ordered collection of objects.
- ArrayList. The ArrayList class implements the List interface. It uses a dynamic array to store the duplicate element of different data types. The ArrayList class maintains the insertion order and is non-synchronized.
Keep it together with Collections. Stay organized and pick up where you left off. Keep track of your ideas, save recipes, plan your next DIY project, and more!
People also ask
What is a collection in Java?
What is Java Collections Framework?
Is collection a part of the collections framework?
What is a collection in JDK?
- Interfaces of Collections FrameWork. The Java collections framework provides various interfaces. These interfaces include several methods to perform different operations on collections.
- Java Collection Interface. The Collection interface is the root interface of the collections framework hierarchy. Java does not provide direct implementations of the Collection interface but provides implementations of its subinterfaces like List, Set, and Queue.
- Subinterfaces of the Collection Interface. As mentioned earlier, the Collection interface includes subinterfaces that are implemented by Java classes. All the methods of the Collection interface are also present in its subinterfaces.
- Java Map Interface. In Java, the Map interface allows elements to be stored in key/value pairs. Keys are unique names that can be used to access a particular element in a map.
- Reduces programming effort: By providing useful data structures and algorithms, the Collections Framework 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. If my network administration API furnishes a collection of node names and if your GUI toolkit expects a collection of column headings, our APIs will interoperate seamlessly, even though they were written independently.
- Reduces effort to learn and to use new APIs: Many APIs naturally take collections on input and furnish them as output. In the past, each such API had a small sub-API devoted to manipulating its collections.
A collection is an object that represents a group of objects (such as the classic Vector class). A collections framework is a unified architecture for representing and manipulating collections, enabling collections to be manipulated independently of implementation details.
A collection represents a group of objects, known as its elements. Some collections allow duplicate elements and others do not. Some are ordered and others unordered. The JDK does not provide any direct implementations of this interface: it provides implementations of more specific subinterfaces like Set and List.
