Constructor
A constructor is a special method that is automatically called at the creation of an object. The identifier of this method is the name of the class, and nothing else is required for a method to be a constructor.It is not necessary to explicitely define a constructor but if some processing - attributes initialization for example - is required for each instance of the class.
A constructor has always a "void" return type.
Overriding of method allows a class to have several constructors.
Example: class Car int speed int power void Car(int p) ` this method is the constructor speed = 0 ` speed is initialized with a default value power = p ` power is initialized by an argument return /class
Une classe peut avoir plusieurs constructeurs grâce au principe de surcharge des
méthodes.
| Example of class, with the speed and power attributs set up by the constructor of the class. |
class
Cas int speed int power void car(int p) ` this method is the constructor speed = 0 ` initializing the speed power = p `initializing the power return /class |
| Exercises |
|
1) Define the "demo" class demo with a constructor to initialize
these variables : |