DelphiBasics
TObject
Type
The base class type that is ancestor to all other classes System unit
  type TObject = class
    constructor Create;
    ...
    ...
    destructor Destroy; virtual;
  end;
Description
The TObject type defines the base class type. It is the oldest grandparent of all classes - every class is ultimately derived from TObject.
 
Because of this, every object inherits the methods of TObject.
 
The TObject methods fall into two categories - class and non-class. When prefixed by the keyword Class, a method may be called in both an object of the class, and in the class itself. Such a static method cannot access any class fields because a class has no data itself - only instantiated classes - objects - have data.
 
Some key Class (static) methods:
 
function ClassName  Gives the class name as a string
ClassParent  Gives the class parent name
ClassInfo  Gives class Run Time info
InstanceSize  Size of class object in bytes
NewInstance  Creates a new class object

 
Some key Object methods:
 
Create  Empty object creator
Free  Calls Destroy for a non-nil object ref
Destroy  Releases object storage
AfterConstruction  Called after construction
BeforeDestruction  Called before destruction
Related commands
Class Starts the declaration of a type of object class
Printer Returns a reference to the global Printer object
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Example code : Using TObject methods inherited in a TForm subclass
begin
  // The unit form was derived from TObject.
  // So we can use methods of TObject:
  ShowMessage('Form1 object class name = '+
              Form1.ClassName);
  ShowMessage('Form1 object class parent name = '+
              Form1.ClassParent.ClassName);
  ShowMessage('Form1 object instance size = '+
              IntToStr(Form1.InstanceSize));

  // And now on TObject itself
  ShowMessage('TObject class name = '+
              TObject.ClassName);
  ShowMessage('TObject instance size = '+
              IntToStr(TObject.InstanceSize));
end;
Show full unit code
   Form1 object class name = TForm1
   Form1 object parent class name = TForm
   Form1 object instance size = 764
   TObject class name = TObject
   TObject instance size = 4
 
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