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It all depends on if AbstractB implements C semantically. I.e if it makes sense semantically for AbstractB to implement C, then go for it.

If we take concrete examples the semantic difference becomes clear.

If A = Dog , AbstractB = Animal, C = IBark

Only choice that makes sense is

class Dog extends Animal implements IBark{

This makes no sense, since this would imply that all animals bark.

class Animal implements IBark{

The other differences come into play if you have more than just class A inheriting from AbstractB. In #1 they need not implement C, in #2 they are all forced to implement C.

It all depends on if AbstractB implements C semantically. I.e if it makes sense semantically for AbstractB to implement C, then go for it.

If we take concrete examples the semantic difference becomes clear.

If A = Dog , AbstractB = Animal, C = IBark

Only choice that makes sense is

class Dog extends Animal implements IBark{

This makes no sense, since this would imply that all animals bark.

class Animal implements IBark{

The other differences come into play if you have more than just class A inheriting from AbstractB. In #1 they need not implement C, in #2 they are forced to implement C.

It all depends on if AbstractB implements C semantically. I.e if it makes sense semantically for AbstractB to implement C, then go for it.

If we take concrete examples the semantic difference becomes clear.

If A = Dog , AbstractB = Animal, C = IBark

Only choice that makes sense is

class Dog extends Animal implements IBark{

This makes no sense, since this would imply that all animals bark.

class Animal implements IBark{

The other differences come into play if you have more than just class A inheriting from AbstractB. In #1 they need not implement C, in #2 they are all forced to implement C.

1
source | link

It all depends on if AbstractB implements C semantically. I.e if it makes sense semantically for AbstractB to implement C, then go for it.

If we take concrete examples the semantic difference becomes clear.

If A = Dog , AbstractB = Animal, C = IBark

Only choice that makes sense is

class Dog extends Animal implements IBark{

This makes no sense, since this would imply that all animals bark.

class Animal implements IBark{

The other differences come into play if you have more than just class A inheriting from AbstractB. In #1 they need not implement C, in #2 they are forced to implement C.