Delphi 中的哈希表(1): THashedStringList

2016-08-22 10:19:44来源:http://zsqztg.blog.51cto.com/601880/289286作者:zhangshengqi人点击


unit Unit1;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;type TForm1 = class(TForm) Button1: TButton; Button2: TButton; procedure Button1Click(Sender: TObject); procedure FormCreate(Sender: TObject); procedure FormDestroy(Sender: TObject); procedure Button2Click(Sender: TObject); private { Private declarations } public { Public declarations } end;var Form1: TForm1;implementation{$R *.dfm}uses IniFiles; //THashedStringList 来自 IniFiles 单元var Hash: THashedStringList;{ THashedStringList 继承自 TStringList, 只是覆盖了 IndexOf、IndexOfName 两个方法以增加效率; 如果注重效率而不需要太多功能, 可以使用 TStringHash, 它是直接从 TObject 继承的数组链表 }//建立哈希表procedure TForm1.FormCreate(Sender: TObject);var i: Integer;begin Hash := THashedStringList.Create; for i := 97 to 122 do begin Hash.Add(Chr(i) + '=' + IntToStr(i)); end; ShowMessage(Hash.Text);{构建结果: a=97 b=98 c=99 d=100 e=101 f=102 g=103 h=104 i=105 j=106 k=107 l=108 m=109 n=110 o=111 p=112 q=113 r=114 s=115 t=116 u=117 v=118 w=119 x=120 y=121 z=122}end;//检索哈希表procedure TForm1.Button1Click(Sender: TObject);var i: Integer;begin i := Hash.IndexOf('z=122'); ShowMessage(IntToStr(i)); //25 i := Hash.IndexOfName('z'); ShowMessage(IntToStr(i)); //25end;//基本操作procedure TForm1.Button2Click(Sender: TObject);begin Hash.Values['a'] := '65'; //赋值 Hash.ValueFromIndex[0] := '65'; //用索引赋值 ShowMessage(Hash.Values['z']); //122, 取值 ShowMessage(Hash.ValueFromIndex[25]);//122, 用索引取值 {其他操作参加 TStringList}end;procedure TForm1.FormDestroy(Sender: TObject);begin Hash.Free;end;end.

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