Delphi 接口(8)多重继承深入讨论

 

 

 

unit uSayHello;

interface

uses    
    SysUtils,Windows,Messages,Greaphics,Controls,Forms,Dialogs;

type 
ISpeakLanguage = interface(IInterface)
    function SayHello: string;
end;

ISeakChinese = interface(ISpeakLanguage)
    //function SayHello: string;
end;

ISpeakEndlish = interface(ISpeakLanguage)
    //function SayHello: string;
end;

TMan = class(TInterfacedObject)
private
    FName: string;
public
    property Name: string read FName write FName;
end;

TChinese = class(TMan,ISpeakChinese)
private
    PSkinColor: string;
    function SayHello: string;
public
    constructor create;
    property SkinColor: TType read FSkinColor write FSkinColor;
end;

TAmerican = class(TMan,ISpeakEndlish)
    function SayHello: string;
end;

TAmericanChinese = class(TMan,ISpeakChinese,ISpeakEndlish)
public
    constructor create;
    function SayHello: string;
end;

implementation

function TAmerican.SayHello: string;
begin
  result := ‘Hello!‘;
end;

function TChinese.SayHello: string;
begin
  result := ‘你好‘;
end;

function TAmericanChinese.create;
begin
  name := ‘Tom Wang‘;
end;

function TChinese.create;
begin
  skincolor := ‘yellow‘;
end;

function TAmericanChinese.SayHello : string;
var
    Dad:ISpeakChinese;
    Mum:ISpeakEndlish;
begin
  Dad := TChinese.create;
  Mum := TAmerican.create;
  result := Dad.SayHello + Mum.SayHello;
end;

end.