Java Fundamentals - Methods, Variables, and Memory Management

Overriding (runtime polymorphism through inheritance) and overloading (compile-time polymorphism with same name, different parameters) are concepts that apply specifically to methods in object-oriented programming. They are not applicable to variables or classes.

Protected members in Java are accessible within the same package and through inheritance to subclasses. For a subclass outside the package, the protected member can only be accessed through inheritance (not via a superclass object reference).

In Java, varargs (int...) must be the last parameter in a method signature. Option A is a simple varargs parameter - valid. Option B has a required parameter before varargs - valid because varargs is still last. Option C uses array syntax instead of varargs - syntactically valid but different semantics (would not match a varargs call in overloading). Option D is invalid because varargs cannot be followed by another parameter.

Static variables (class variables) are created when the class is loaded and persist until the program ends - they have the longest scope. Instance variables exist only as long as the object exists. Local (method) variables exist only during method execution. Block variables have the narrowest scope, existing only within their code block.

Java has defined default values for uninitialized fields: Object references default to null, numeric primitives to 0 or 0.0, boolean to false, and char to '\u0000' (null character). All four options correctly state these default values for their respective types.