What does method overriding achieve in Java?

• A. It disables the inherited method
• B. It allows changing the implementation of a base class method in a derived class
• C. It prevents polymorphism
• D. It requires all methods to be declared as final

Answer: (B)

Method overriding in Java allows a derived class to provide a specific implementation of a method that is already defined in its base class. When a subclass overrides a method, it replaces or alters the base class's version of the method, contributing to the concept of polymorphism in object-oriented programming. This means that when a method is called on an object, the runtime will determine which method to execute based on the object's actual class type rather than the reference type.

This is particularly useful for providing behavior that is more specific to the derived class without modifying the base class, facilitating code reuse and enhancing flexibility. It allows subclasses to modify or extend the functionality of the methods inherited from their parent classes, leading to a more dynamic, adaptable program.

The other options do not accurately capture the essence of method overriding. For instance, overriding does not disable inherited methods; rather, it modifies their behavior. It is also a fundamental aspect of polymorphism, enhancing it rather than preventing it. Lastly, not all methods are required to be final; in fact, making a method final prevents it from being overridden, which is contrary to the overriding concept.