Question

public class A extends B implements C {
}

Class B and interface C have the same member function name（not the same signature）.
This code can’t be compiled. How can I solve this?

Answer 1

The inherited class implements your interface method, so there should not be an error. In fact, both having the same name is really the idea of implementing an interface…

Here’s a check list:

• The method must have not only the same name, but the same signature. Make sure you’ve specified the correct argument and return types (this includes initial values).
• If your sub class A also implements the same method, you must mark it as override. Same rules apply regarding the signature.
• If you do override B’s method, it must not be declared final.