Java — Which two are legal declarations for non-nested classes and interfaces?

Introduction / Context:This evaluates legal top-level class and interface declarations.

Concept / Approach:

• A top-level class can be public or default only (not protected/private).
• It cannot be both final and abstract at the same time (contradiction).
• Interfaces cannot be static at the top level.
• abstract public class Test {} is legal.
• final public class Test {} is legal.

Final Answer:final public class Test {} and abstract public class Test {}