本文整理自网络，侵删。
我的这个示例实为一个主线程，两个辅线程，辅线程是重新定义了两线程类，Tthread1和Tthread2，都是从Tthread继承而来。
关键是两个辅线程的Execute事件重载了祖先类Tthread的Execute.实现了相应的功能。这两个线程的事件可同时执行，无需等待。
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
Tthread1 = class(Tthread)
protected
procedure Execute;override;
end;
type
Tthread2 = class(Tthread)
protected
procedure Execute;override;
end;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
st1: TStaticText;
st2: TStaticText;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure Tthread1.Execute;
var
i: integer;
begin
FreeOnTerminate:=true;
for i:=1 to 10000 do
begin
form1.st1.Caption:= inttostr(i);
application.ProcessMessages;
end;
end;
procedure Tthread2.Execute;
var
i: integer;
begin
FreeOnTerminate:=true;
for i:=1 to 10000 do
begin
form1.st2.Caption:= inttostr(i);
application.ProcessMessages;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
mythread:Tthread1;
begin
mythread:=Tthread1.Create(false);
end;
procedure TForm1.Button2Click(Sender: TObject);
var
mythread:Tthread2;
begin
mythread:=Tthread2.Create(false);
end;
end.
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