i think they are wrong

[feng cao]

a) An interface that is declared within the body of a class or interface is known as a nested interface.
b) A class declaration can be a member of an interface.

the two questions are from a mock exam. the answer is that they are right. but I test them. they are wrong.
i.e

interface A{
B b; //if you declare B here, there is a compile error.
A1 a; //the same as above. you have to initialize a.
}
interface B{}
class A1{}

[marc weber]

I think they meant "defined" rather than "declared." That is...

interface A {
  interface B {}
  class C {}
}

Which mock exam is this in?

[mambe nanje]

I think nested interface declaration and classes is available thru this

button.addEventListener(new ActionListener(){
public void actionPerformed(){
//do stuff
}
});

the syntax may be wrong but that is and inner interface being instantiated, and such and interface can be considered to be instantiated and if we use something like WindowAdapter, then that will be a class being instantiated but realy what we are creating is an object that implements the interface

[feng cao]

in Dan Chisholm mock exam. chapter10

[Jim Yingst]

[Marc]: I think they meant "defined" rather than "declared." That is...

I think "declared" is perfectly fine here. That's the term the JLS would use. The distinction to be made here is that the original poster thought the question was talking about the declaration of a field (at least, that's what his test code is about), and the question was actually about nested class and interface declarations (as shown in Marc's code example).