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.
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.