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;

type
  TForm1 = class(TForm)
    Button1: TButton;
    ListBox1: TListBox;
    Label1: TLabel;
    Edit1: TEdit;
    Label2: TLabel;
    Label3: TLabel;
    Memo1: TMemo;
    ComboBox1: TComboBox;
    Label4: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  Memo1.Lines.Add(Edit1.Text);       //添加国名到Tmemo中
  If ListBox1.ItemIndex>=0           //用户在ListBox中已作选择
     Then Memo1.Lines.Add(ListBox1.Items[ListBox1.ItemIndex]); //添加大洲名到Memo中
  Memo1.Lines.Add(ComboBox1.Text);
end;





procedure TForm1.FormCreate(Sender: TObject);
begin
  ListBox1.Items.Add('亚洲');
  ListBox1.Items.Add('非洲');
  ListBox1.Items.Add('欧洲');
  ListBox1.Items.Add('北美洲');
  ListBox1.Items.Add('南美洲');
  ListBox1.Items.Add('大洋洲');
  ListBox1.Items.Add('南极洲');
  ComboBox1.SelText
end;

end.