详测 Generics Collections TQueue (1): Enqueue、Dequeue、Peek

unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses Generics.Collections;
procedure TForm1.Button1Click(Sender: TObject);
var
Queue: TQueue<string>;
s,str: string;
begin
Queue := TQueue<string>.Create();
{入列}
Queue.Enqueue('AAA');
Queue.Enqueue('BBB');
Queue.Enqueue('CCC');
Queue.Enqueue('DDD');
{查看}
str := '';
for s in Queue do str := str + s + ' ';
ShowMessage(str); {AAA BBB CCC DDD}
{出列, 并查看出列元素}
ShowMessage(Queue.Dequeue); {AAA}
str := '';
for s in Queue do str := str + s + ' ';
ShowMessage(str); {BBB CCC DDD}
{查看下一个将要出列的是...}
ShowMessage(Queue.Peek); {BBB}
Queue.Free;
end;
end.