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The Collection Interfaces

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Collections in Java

Java provided ad hoc classes such as Dictionary, Vector, Stack, and Properties to store and manipulate groups of objects. Although these classes were quite useful, they lacked a central, unifying theme. Thus, the way that you used Vector was different from the way that you used Properties.

The collections framework was designed to meet several goals, such as –

  • The framework had to be high-performance. The implementations for the fundamental collections (dynamic arrays, linked lists, trees, and hashtables) were to be highly efficient.
  • The framework had to allow different types of collections to work in a similar manner and with a high degree of interoperability.
  • The framework had to extend and/or adapt a collection easily.

Towards this end, the entire collections framework is designed around a set of standard interfaces. Several standard implementations such as LinkedList, HashSet, and TreeSet, of these interfaces are provided that you may use as-is and you may also implement your own collection, if you choose.

A collections framework is a unified architecture for representing and manipulating collections. All collections frameworks contain the following –

Interfaces – These are abstract data types that represent collections. Interfaces allow collections to be manipulated independently of the details of their representation. In object-oriented languages, interfaces generally form a hierarchy.

Implementations, i.e., Classes – These are the concrete implementations of the collection interfaces. In essence, they are reusable data structures.

Algorithms – These are the methods that perform useful computations, such as searching and sorting, on objects that implement collection interfaces. The algorithms are said to be polymorphic: that is, the same method can be used on many different implementations of the appropriate collection interface.

In addition to collections, the framework defines several map interfaces and classes. Maps store key/value pairs. Although maps are not collections in the proper use of the term, but they are fully integrated with collections.

The Collection Interfaces

The collections framework defines several interfaces. This section provides an overview of each interface –

  1. The Collection Interface
  2. This enables you to work with groups of objects; it is at the top of the collections hierarchy.

  3. The List Interface
  4. This extends Collection and an instance of List stores an ordered collection of elements.

  5. The Set
  6. This extends Collection to handle sets, which must contain unique elements.

  7. The SortedSet
  8. This extends Set to handle sorted sets.

  9. The Map
  10. This maps unique keys to values.

  11. The Map.Entry
  12. This describes an element (a key/value pair) in a map. This is an inner class of Map.

  13. The SortedMap
  14. This extends Map so that the keys are maintained in an ascending order.

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