Which two of the following are legal declarations for nonnested classes and interfaces?
1.final abstract class Test {}
2.public static interface Test {}
3.final public class Test {}
4.protected abstract class Test {}
5.protected interface Test {}
6.abstract public class Test {}
Answer: C
(3), (6). Both are legal class declarations.
(1) is wrong because a class cannot be abstract and final—there would be no way to use such a class. (2) is wrong because interfaces and classes cannot be marked as static. (4) and (5) are wrong because classes and interfaces cannot be marked as protected.