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.
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