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Definition

instantiation

Contributor(s): John MacLeod

In programming, instantiation is the creation of a real instance or particular realization of an abstraction or template such as a class of objects or a computer process. To instantiate is to create such an instance by, for example, defining one particular variation of object within a class, giving it a name, and locating it in some physical place.

1) In object-oriented programming, some writers say that you instantiate a class to create an object, a concrete instance of the class. The object is an executable file that you can run in a computer.

2) In the object-oriented programming language, Java, the object that you instantiate from a class is, confusingly enough, called a class instead of an object. In other words, using Java, you instantiate a class to create a specific class that is also an executable file you can run in a computer.

3) In approaches to data modeling and programming prior to object-oriented programming, one usage of instantiate was to make a real (data-filled) object from an abstract object as you would do by creating an entry in a database table (which, when empty, can be thought of as a kind of class template for the objects to be filled in).

This was last updated in September 2005

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You said, "In the object-oriented programming language, Java, the object that you instantiate from a class is, confusingly enough, called a class instead of an object." This is complete nonsense. An object instantiated from a class is not called a class, it is an object of that class. The class is simply a blueprint for an object (which is a consequence of the fact that ALL Java classes are in fact sub-classes of java.lang.Object, and inherit its characteristics).

You guys need to hire better writers.
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