unit1.pas

这有很多Delphi应用的例子

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    RadioGroup1: TRadioGroup;
    Edit1: TEdit;
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  RadioGroup1.Items.Add('苹果');
  RadioGroup1.Items.Add('波萝');
  RadioGroup1.Items.Add('香蕉');
  RadioGroup1.Items.Add('西瓜');
  RadioGroup1.Items.Add('葡萄');
  RadioGroup1.ItemIndex := 5;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Edit1.Text:=RadioGroup1.Items[RadioGroup1.ItemIndex];
end;

end.