详测 Generics Collections TStack(1): Push、Pop、Peek - 其他功能同 TQueue

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
  Stack: TStack<string>;
  s,str: string;
begin
  Stack := TStack<string>.Create();

  {压栈}
  Stack.Push('AAA');
  Stack.Push('BBB');
  Stack.Push('CCC');

  str := '';
  for s in Stack do str := str + s + ' ';
  ShowMessage(str); {AAA BBB CCC }

  {出栈: 后进的先出}
  Stack.Pop;

  str := '';
  for s in Stack do str := str + s + ' ';
  ShowMessage(str); {AAA BBB }

  {下一个将要出栈的...}
  ShowMessage(Stack.Peek); {BBB}

  Stack.Free;
end;

end.