In java how collection is single unit of objects

Posted by GyanGuide1 on April 26th, 2017

Introduction to Collections

A collection sometimes known as a container is an object that groups multiple elements into a single unit. Collections are used to store, retrieve, manipulate, and communicate aggregate data.

Typically, they represent data items that form a natural group, such as a , a mail folder (a collection of letters), or a telephone directory (a mapping of names to phone numbers).

What Is a Collections Framework?

A collections framework is a unified architecture for representing

and manipulating collections.

What is Collection in java?

Collection represents a single unit of objects i.e. a group.

What is framework in java?

- provides readymade architecture. java training center bangalore

- represents set of classes and interface.

Collection consist of 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: 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 essence, algorithms are reusable functionality.

 Benefits of the Java Collections Framework

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The Java Collections Framework provides the following benefits:

Reduces programming effort: By providing useful data structures and algorithms, the Collections Framework frees us to concentrate on the important parts of your program rather than on the low-level "plumbing" required to make it work. By facilitating interoperability among unrelated APIs, the Java Collections Framework frees you from writing adapter objects or conversion code to connect APIs.

Increases program speed and quality:This Collections Framework provides high-performance, high-quality implementations of useful data structures and algorithms. The various implementations of each interface are interchangeable, so programs can be easily tuned by switching collection implementations. Because you're freed from the drudgery of writing your own data structures, java/j2ee classes bangalore you'll have more time to devote to improving programs' quality and performance.

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. Advanced java training in bangalore There was little consistency among these ad hoc collections sub-APIs, so you had to learn each one from scratch, and it was easy to make mistakes when using them. With the advent of standard collection interfaces, the problem went away.

Reduces effort to design new APIs: This is the flip side of the previous advantage. Designers and implementers don't have to reinvent the wheel each time they create an API that relies on collections; instead, they can use standard collection interface.

Fosters software reuse: New data structures that conform to the standard collection interfaces are by nature reusable. The same goes for new algorithms that operate on objects that implement these interfaces.

Summary

The Java collections framework gives the programmer access to prepackaged data structures as well as to algorithms for manipulating them. best core java training in bangalore

A collection is an object that can hold references to other objects. The collection interfaces declare the operations that can be performed on each type of collection.

The classes and interfaces of the collections framework are in package java.util.

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