About Question enthuware.ocpjp.v11.2.3650 :

[Dzholdoshev]

What if I want to print text from House's default method, what code should I write?
((House)off).lockTheGates(); doesn't work

[admin]

You can call House.super.lockTheGates(); from within any instance method of HomeOffice class.

You cannot use this syntax from outside HomeOffice to invoke House's lockTheGates(), though. Meaning, if you have a reference to a HomeOffice object, then the method implemented by HomeOffice will be invoked. It is not possible to invoke the default method if the implementing object has overridden it.

It is the same as in any instance method in a super class - subclass hierarchy. Once a subclass overrides a superclass's method, it is not possible to access the super class's implementation. But that's ok because that's is the whole point of overriding a method.

[giginar]

Even if you make HomeOffice abstract, it will still fail to compile because it will inherit two incompatible methods with the same name - one from Home, which is default and one from Office, which is abstract.

Hello, in this sentence there is a 'typo'; the name of the interface is not 'Home', it should be 'House'. thanks.

[admin]

Noted. Thank you for your feedback!