Java best practices: Re-declaring inherited interfaces?

Asked Jan 29 '18 at 05:02

Active Jan 29 '18 at 05:02

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I know that when a class extends another class, it will inherit all interfaces that it has implemented. In terms of best practices, does it make sense to declare again in subclass?

public interface LeggedCreature {
    public int getLegCount();
}

public abstract class Animal implements LeggedCreature {
    ...
}

public class Dog extends Animal {
    @Override public int getLegCount() { return 4; }
}

public class MutatedDog extends Dog {
    @Override public int getLegCount() { return 6; }
}

Does that make more sense, or does the version below makes more sense?

public class MutatedDog extends Dog implements LeggedCreature {
    @Override public int getLegCount() { return 6; }
}

asked Jan 29 '18 at 05:02

Jai

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`@Override` will stop mistakes there so I don’t think you need to. – Ry- Jan 29 '18 at 05:03
i think it is. declare interface will let user note that it's a implement of interfaces. this is more readable. – Shen Yudong Jan 29 '18 at 05:07
@yudongshen The Javadoc is the same whether you do or don't do this. – user207421 Jan 29 '18 at 05:41

Java best practices: Re-declaring inherited interfaces?

0 Answers0