常量的 访问限制

Posted 2020-09-16 不能富贵难成大器皆因懒， 胸无大志庸庸碌碌只为闲。

unit Unit5;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm5 = class(TForm)
    Button1: TButton;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

TBoy = class
  const
    abc = ‘boy‘;
end;

TGirl = class
  const
    abc = ‘girl‘;

end;


const

  abc = ‘真全局‘;

var
  Form5: TForm5;

implementation

{$R *.dfm}

procedure TForm5.Button1Click(Sender: TObject);
begin
  Memo1.Lines.Add(abc);
  Memo1.Lines.Add(TBoy.abc); //类常量 是有 访问限制的
  Memo1.Lines.Add(TGirl.abc)
end;

procedure TForm5.FormCreate(Sender: TObject);
begin
  ReportMemoryLeaksOnShutdown := True;
end;

end.