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| In ], a '''constructor''' is a ] |
In ], a '''constructor''' in a class is a special ] (function) that can be used to create objects of the class and never has a return type. Constructors are special ] that are called automatically upon the creation of an ] (instance of a class). They are distinguished by having the same name as the ] of the object they're associated with. Its main purpose is to pre-define the object's ] and to establish the ] of the class, failing if the invariant isn't valid. A properly written constructor will leave the ] in a 'valid' state. | ||
| === ] === | |||
| ==== Example ==== | |||
| public class Example | |||
| { | |||
| //declaration of instance ](s). | |||
| protected int data; | |||
| //defenition of the '''constructor'''. | |||
| public Example() | |||
| { | |||
| data = 1; | |||
| } | |||
| } | |||
| ==See also== | ==See also== | ||
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| ] | ] | ||
| {{compu-stub}} | {{compu-stub}} | ||
Revision as of 11:18, 31 December 2005
In object-oriented programming, a constructor in a class is a special method (function) that can be used to create objects of the class and never has a return type. Constructors are special instance methods that are called automatically upon the creation of an object (instance of a class). They are distinguished by having the same name as the class of the object they're associated with. Its main purpose is to pre-define the object's data members and to establish the invariant of the class, failing if the invariant isn't valid. A properly written constructor will leave the object in a 'valid' state.
Java
Example
public class Example
{
//declaration of instance variable(s).
protected int data;
//defenition of the constructor.
public Example()
{
data = 1;
}
}
See also
References
- Bjarne Stroustrup: The C++ Programming Language, Addison-Wesley, ISBN 0-201-70073-5
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