Thread: how to extend a subclass?!

hi,
i want to write a class that extends from a subclass of another class,something like this:

public class A{
//some codes here
public class B{
//some codes here
}
}

public class C extends A.B ( or public class C extends B ){
//some codes here
}

can anyone help me with that?!

What happened when you tried? Did you get an error message?

when i try this code (public class C extends A.B) i get this error message :
No enclosing instance of type DataStructures is available due to some
intermediate constructor invocation

i dont know how to resolve this error message...

That's because your B class is not a subclass, it's an inner class. And since your B class is not static, it belongs to a specific instance of A. So when you try to make C extend B, the compiler says "I can't reach B without an instance of A".

Is there a reason you're keeping B as an inner class? Is there a reason it's not static?