解决这个问题的唯一方法是将您的类声明为 abstract ，并将其保留为子类以实现缺少的方法。但最终，链中的某个人必须实现它以满足接口合同。如果你真的不需要特定的方法，你可以实现它，然后返回或抛出一些 NotImplementedException ，在你的情况下哪个更合适。

The only way around this is to declare your class as abstract and leave it to a subclass to implement the missing methods. But ultimately, someone in the chain has to implement it to meet the interface contract. If you truly do not need a particular method, you can implement it and then either return or throw some variety of NotImplementedException, whichever is more appropriate in your case.

接口也可以指定一些方法为'default'并在接口定义中提供相应的方法实现（ https://docs.oracle.com/javase/tutorial/java/IandI/defaultmethods。 HTML ）。实现接口时无需提及这些默认方法。

The Interface could also specify some methods as 'default' and provide the corresponding method implementation within the Interface definition (https://docs.oracle.com/javase/tutorial/java/IandI/defaultmethods.html). These 'default' methods need not be mentioned while implementing the Interface.