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interface DongVat { void An(); } interface DongVatSongDuoiNuoc : DongVat { void Boi(); } class ConCa : DongVatSongDuoiNuoc { public void An() { } public void Boi() { } }
ConCa conCa = new ConCa(); DongVat dongVat = conCa; DongVatSongDuoiNuoc dongVatSongDuoiNuoc = conCa;
class ConBo: DongVatSongDuoiNuoc { public void An() { } public void Boi() { throw new Exception("Con bo khong biet boi"); } }
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