Constructors & Destructors

Introduction To Constructors

A class’s constructors control its initialization.

A constructor’s code executes to initialize an instance of the class when a program requests a new object of the class’s type.

Note: Constructors often set properties of their classes, but they are not restricted to doing so.

Constructor Declaration

Like other methods, a constructor can either have or not have parameters.

Note: A constructor’s name must be the same as the name of the class it is declared in.

It is also important to keep in mind that a constructor cannot return a value.

Note: No return type, not even void can be used while declaring a constructor.

Default Constructors

Constructors without any parameters are called default constructors.

The default constructor can be used to set some initial default value of the members of a class but it’s not necessary.

Example

Let’s take a look at how default constructors are declared and called.