unit uSayHello;

interface

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

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

ISpeakEndlish = interface(IInterface)
    function SayHello: string;
end;

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

TChinese = class(TMan,ISpeakChinese)
private
    function SayHello: string;
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 TAmericanChinese : string
 
;
var
    Dad:ISpeakChinese;
    Mum:ISpeakEndlish;
begin
  Dad := TChinese.create;
  Mum := TAmerican.create;
  result := Dad.SayHello + Mum.SayHello;
end;

end.

Delphi 接口(6)-接口和多重繼承