我有接口、抽象方法和更多分類并使用這些引用類型如下。   public interface InterfaceA {    boolean mehod1();    boolean method2();    boolean newMethod(); //When added new method      }public abstract class AbstractA implements InterfaceA{// other common method}public Class C extend AbstractA //have to override three methodpublic Class D extend AbstractA //have to override three methodpublic Class E extend AbstractA //have to override three method but only should be override old methodpublic Class F extend AbstractA  //have to override three method  but only should be override old method這些類派生了 AbstractA 類，我只想在接口中使用新方法，但只實現 C 和 D 類，其他應該只使用舊方法。應該如何設計？