Delphi 中的哈希表(1): THashedStringList
发布时间:2020-12-15 09:59:27 所属栏目:大数据 来源:网络整理
导读: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(Sende
unit Unit1; interface uses 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)); //25 end; //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. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |