Enthuware

If we cannot override the final method (mA), how is it possible to call it from TestClass?

Why do you think final has anything to do with access?

We instantiate object of Encyclopedia: After we want to 'execute' method:
But since type of reference is Book, we need that class Book has mA method. It really has it. But we must `execute` this method from Encyclopedia object, and since this method (in Encyclopedia object) is not compile, how could we `execute` it?

Sorry but I am not sure what you mean by "and since this method (in Encyclopedia object) is not compile". Can you be a bit more clear about what you mean by this so that I can address your confusion?

Remember that final just means that a subclass cannot override it. It doesn't mean the subclass cannot access it or can not inherit it. This is OCAJP stuff

I just try to understand if the line //2 will cause compilation to fail, then how could we run method o1.mA()? Since this method is fail to compile. By this logic the line //4 should not compile too?
I have passed OCA (81%) ))

In other words, how could we run something if this "someting" is not compiled?

Sergey wrote:In other words, how could we run something if this "someting" is not compiled?

Line marked //2 doesn't compile because it is trying to override a final method. There is no problem with line marked //4 because Encylopedia inherits method mA() from Book.

Thanks. Now it is clear. It (method mA()) cannot be overridden but it inherited.