Java Inheritance - implementation and extension

Question

I have class A, and interfaces I, J, K and L

I then have AB and finally class C

class AB extends A

class C extends AB implements I, J, K, L

Interface I requires a method void setSize(int size).

Class A already has a method setSize(int size){this.size = size;}

Am I correct in saying I still have to override class A's setSize and implement setSize in class C to get the implementation correct?

FYI, I, J, K, and L are called Interfaces, not Implementations — chama
– chama, Commented Oct 30, 2014 at 20:04

khelwood · Accepted Answer · 2014-10-30 19:56:26Z

2

If your class provides the method setSize(int) (matching the signature of the interface), then it will satisfy the interface requirements. If it inherits a matching method (not abstract) from a superclass, then it is provided; you don't need to override it.

answered Oct 30, 2014 at 19:56

khelwood

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1 Comment

Narrim Over a year ago

It was wierd my IDE was telling me I had to reimplement and giving me an error...but it was compiling ok. Then throwing non specific run time errors...but I am sure I can work through those. And sorry yes of course they are interfaces...my bad.

Sergii Lagutin · Accepted Answer · 2014-10-30 19:56:33Z

2

If any of superclasses has method with required signature, you don't need to implement it in your classes.

answered Oct 30, 2014 at 19:56

Sergii Lagutin

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