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In software development, an object is an entity that has state, behavior, and identity.cite-ref-ooa-1-0[1] An object can model some part of reality or can be an invention of the design process whose collaborations with other such objects serve as the mechanisms that provide some higher-level behavior. Put another way, an object represents an individual, identifiable item, unit, or entity, either real or abstract, with a well-defined role in the problem domain.cite-ref-ooa-1-1[1]

A programming language can be classified based on its support for objects. A language that provides an encapsulation construct for state, behavior, and identity is classified as object-based. If the language also provides polymorphism and inheritance it is classified as object-oriented. A language that supports creating an object from a class is classified as class-based. A language that supports object creation via a template object is classified as prototype-based.

The concept of object is used in many different software contexts, including:

• Possibly the most common use is in-memory objects in a computer program written in an object-based language.

• Information systems can be modeled with objects representing their components and interfaces.cite-ref-ooa-1-2[1]

• In the relational model of database management, aspects such as table and column may act as objects.cite-ref-oppel-2-0[2]

• Objects of a distributed computing system tend to be larger grained, longer lasting, and more service-oriented than programming objects.

• See also

• References

• External links

• Actor model – Model of concurrent computation

• Business object – Entity within a multi-tiered software application

• Instance (computer science) – Concrete manifestation of an object (class) in software development

• Object lifetime – Time period between the creation and destruction of an object-oriented programming instance

• Object copying – Technique in object-oriented programming

• Semantic Web – Extension of the Web to facilitate data exchange

cite-note-ooa-11. ↑ citerefgrady-boochrobert-maksimchukmichael-englebobbi-young2007Grady Booch; Robert Maksimchuk; Michael Engle; Bobbi Young; Jim Conallen; Kelli Houston (April 30, 2007). Object-Oriented Analysis and Design with Applications (3 ed.). Addison-Wesley Professional. ISBN 978-0201895513.

cite-note-oppel-22. ↑ citerefoppel2005Oppel, Andy (2005). SQL Demystified. McGraw Hill. p. 7. ISBN 0-07-226224-9.

• What Is an Object? from The Java Tutorials