Classes are built to create objects and then the objects are allocated in the constructors and used in the methods. The objects that are allocated in the constructor should have a releasing point and that is also in the destructor method. The process in which, the constructor constructs, and after the work destructor destructs is called converse process. The classes can be made to handle the memory properly by using the persistence property after the object that is currently used is being destroyed.

THe example is as follows:

unit My;

interface

uses

Classes;

type

TMy = class

private

fileData: TStringList;

published

Constructor Create (const fileName: string);

Destructor Destroy; override;

procedure PrintFile;

end;