Constructors and Destructors
You can define all sorts of methods for a class, but there are two kinds of methods that have a very special place in an object’s lifetime: constructors and destructors.
A constructor is a method that is called automatically when the program creates a new instance of a class. When part of the program creates a new instance of the class, the system calls the appropriate constructor before it returns the new object to the code that created it.
You can use a constructor to initialize the object’s properties and fields, get data for the object from a database, open resources, such as files, that the object will use, and generally prepare the object for use.
The syntax for constructors differs from language to ...