结论:

1. inherited默认调用的是父类的同名 同参数方法。(常用,如果是同名 同参数方法 比如 overide 的,可以省略,只写个inherited就可。)

2. 子类的方法里可以 inherited+ 父类的其它非同名 同参数方法。见:下方 son3

若父类不存在 同名 同参数方法 则编译报错。如下图:

inherited 的研究。-LMLPHP

inherited 的研究。-LMLPHP

unit Unit6;

interface

uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.Samples.Gauges; type
TForm6 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end; TFather = class
public
constructor Create; overload;
constructor Create(const str: string); overload;
end; TSon = class(TFather)
public
constructor Create; overload;
constructor Create(const str: string); overload;
constructor Create(const str1, str2: string); overload;
end; var
Form6: TForm6; implementation {$R *.dfm} { TFather } constructor TFather.Create;
begin
OutputDebugString('father');
end; constructor TFather.Create(const str: string);
begin
OutputDebugString(PChar(str));
end; { TSon } constructor TSon.Create;
begin
inherited;
end; constructor TSon.Create(const str: string);
begin
inherited;
end; constructor TSon.Create(const str1, str2: string);
begin
//inherited; //父类没有两个参数的函数的时候会怎样?
inherited Create(str1 + str2); //这里用了 非同名 同参数方法
end; procedure TForm6.Button1Click(Sender: TObject);
var
son1, son2, son3: TSon;
begin
son1 := TSon.Create;
son2 := TSon.Create('test');
son3 := TSon.Create('abc', 'cde'); son1.Free;
son2.Free;
son3.Free;
end; end.
04-28 01:35