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Revision as of 02:24, 26 January 2006
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;
//definition of the constructor.
public Example()
{
data = 1;
}
}
See also
References
- Bjarne Stroustrup: The C++ Programming Language, Addison-Wesley, ISBN 0-201-70073-5