Which of the following modifiers can be used with a non-local inner class?

• A. Final, volatile, static
• B. Private, protected, synchronized
• C. Public, protected, private, static, final, abstract
• D. Static, native, strictfp

Answer: (C)

A non-local inner class in Java is defined within the scope of another class but is not a member of the outer class. When it comes to applying modifiers to such classes, Java allows several different access modifiers and some other modifiers as well.

The correct answer includes public, protected, private, static, final, and abstract. Each of these modifiers serves distinct purposes:

• Public: This allows the inner class to be accessible from any other class.

• Protected: This restricts visibility to the same package or subclasses.

• Private: This restricts visibility to only the outer class.

• Static: This is interesting as it allows the inner class to be invoked without an instance of the outer class. However, a static inner class cannot access non-static members of the outer class without a reference to an instance of that outer class.

• Final: This modifier indicates that the inner class cannot be subclassed.

• Abstract: An abstract inner class can be defined, which means it can have abstract methods and cannot be instantiated until those methods are implemented.

In contrast, non-local inner classes cannot be marked as volatile or synchronized as those are intended for fields and methods, respectively, and wouldn't apply at