CODEWITHSUNDEEP
javainheritanceinterface-implementation
shrumsowen11
shrumsowen11

Reputation: 57

Does a class which is extending an abstract class still has to implement the interface that abstract class is implementing?: java

public abstract class ClassA implements ClassB{
}



public class ClassC extends ClassA implements ClassB{
}

Since class "ClassC" is extending class "ClassA", does "ClassC" still has to implement "ClassB"? Or "ClassB" is automatically implemented for class "ClassC"?

Upvotes: 0

Views: 52

Answers (2)

Jim Garrison
Jim Garrison

Reputation: 86764

Assuming ClassA is not abstract and fully implements ClassB, then ClassC inherits ClassA's implementation and does not need to re-implement anything from ClassB unless it wants to override the behavior.

It also does not need to specify implements ClassB. The following example is valid:

public static interface I { }
public static class A implements I { }
public static class B extends A { }

public static void main(String[] args) {
    I b = new B();
}

Upvotes: 1

Leonardo Tadeu Mantovani
Leonardo Tadeu Mantovani

Reputation: 25

You dont need do implement again it is already implemented by the Product Class, i've created an example to show you

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I created the method just to show you how it would work

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If you implement the interface into the super class all the childs will have the Interface methods! Hope it helps :)

Upvotes: 0

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