About Question enthuware.ocpjp.v21.2.3689 :

[steevman]

The question here states "Identify correct statements.".
The option "Class B will compile if, instead of final, it is made non-sealed." is considered wrong, with the explanation:
"A permitted subclass of a sealed class must be final, non-sealed, or sealed. So, final is fine for class B."

While final is perfectly fine, so is "non sealed", which makes "Class B will compile if, instead of final, it is made non-sealed." true.

[admin]

Actually the option is trying to imply that final has to be removed and then made non-sealed. But you are right, it is not written correctly to imply the same unambiguously.
Fixed.
thank you for your feedback!

[nnavlani]

In your explanation, "A permitted subclass of a sealed class must be final, non-sealed, or sealed. So, final is fine for class B.
Remember that since interfaces cannot be final, a permitted subinterface of a sealed interface must be either sealed or non-sealed." In the question, it's a Class and NOT an interface. And so Class B can or cannot be extended and so there should be no need to change final to non-sealed.

[admin]

Not sure what is your point.

[nnavlani]

My Point is that the answer explains that A and B are Interfaces, whereas in the question, both A and B are Classes and NOT interfaces. So while the explanation may be good and works for interfaces, the question is asked for A and B as classes only.

[admin]

The first line of the explanation is for classes. It completes the reasoning for the given situation.
The second line gives extra information relevant for interfaces. It is not for this particular code but provides extra info if the given code had interfaces inste of classes.

[vs2013]

Hi. I don't have a mention of class B declared as an interface anywhere in the question, the correct answer also assumes B is a class and not an interface, so also not sure where the interface in the explanation comes from:

Code: Select all

//in file B.java
package p2;
public final class B extends p1.A{
}

Any clarification on this will be greatly appreciated. Thank you.

[admin]

The question is about class B and the explanation explains why this option is correct.

The point about interfaces is extra information.