delphi - How to copy data from one class into another class -

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How to copy data from one class to another using DELPHI using overlapping operator?

My dummy app goes like this: 

  type TClass_A = class a: string; End; TClass_B = Classroom (TClass_A) b: String; End; Implementation Process TForm1.Button1Click (Sender: TObject); Var a: TClass_A; B: T Class_ B; Start one: = TClass_A.Create; B: = TClass_B.create; B: = A; // & lt; & Lt; - What code should be here? Do I Overload: = Operator? End;    
 
 
 Assignment operator can not be overloaded in Delphi.  
 You will need to present a method to copy how this can be done. An example of this is  TPersistent.Assign . The Virtual  Assign  method will be completely justified to get it from  TPersistent  and implementing the desired functionality.

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