About Question enthuware.ocajp.i.v7.2.1220 :

[Javier]

Hi!

I would like to know why is compiling and running without problem the statement:

b.f();// A has got f(), but the object is of type B.
If there is not method f() in the B class...

Why is running without problem??

Thank you!!

[admin]

If B is a subclass of A and if A has non private f() then B will inherit f(). Thus, there is no issue in calling b.f().

[smahale]

In the given code,

public class C{
A a = new A();//1
A b = new B();//2
}

if we were to do System.out.println(a.i);
Would this now print 10, or would it be a compile error?

Thanks!

[admin]

What happened when you tried it out?

[burlacu.valeri]

Hi,

public void f(){}

why b.f( ) is compile error?

For me, it works without errors ... :/

[admin]

Hi,

public void f(){}

why b.f( ) is compile error?

For me, it works without errors ... :/

It is not a compile error that is why this option is not correct. Option 5, "None of the above statements is correct", is the correct option.

[burlacu.valeri]

Hi,

ok, now I have understood.