Need I to put overload or override words after the constructor declaration in derived class?

Question

I have a class hierarchy, this one:

type
TMatrix = class
    protected
      //...
    public
      constructor Create(Rows, Cols: Byte);
    //...
type
  TMinMa         


        

Answer 1

Overload, tells the compiler that a method has the same name with different parameters.

Override, tells the compiler that a method overrides it virtual or dynamic declared in the base class.

Reintroduce, will hide the virtual or dynamic method declared in the base class.

Theses definitions are from Ray Lischner's book {Delphi in a nutshell}

type
  TFirst = class
  private
    FValue: string;
    FNumber: Integer;
  public
    constructor Create(AValue: string; ANumber: integer);

    property MyValue: string read FValue write FValue;
    property MyNumber: Integer read Fnumber write FNumber; 
  end;

  TSecond = class(TFirst)
  public
    constructor Create(AValue: string; ANumber: Integer);
  end;

constructor TFirst.Create(AValue: string; ANumber: integer);
begin
  MyValue := AValue;
  MyNumber := ANumber;
end;

{ TSecond }

constructor TSecond.Create(AValue: string; ANumber: Integer);
begin
  inherited;
end;

The TSecond as it is declared will call the create of the TFirst, without the inherited, the TSecond members stay empty.