What is method overriding in Java?

• A. Creating a new method in the superclass
• B. A subclass providing a specific implementation of a method
• C. Defining multiple methods with the same name
• D. Changing the return type of a method

Answer: (B)

Method overriding in Java occurs when a subclass provides a specific implementation of a method that is already defined in its superclass. This concept is fundamental to Java's object-oriented programming paradigm as it enables polymorphism, allowing a subclass to define behavior that is specific to its type while still maintaining the same method signature as the superclass.

When a subclass overrides a method, it can provide its unique functionality that may be more suitable for its own context. The method in the subclass must have the same name, return type, and parameters as the method in the superclass. When an overridden method is called on an object of the subclass, the subclass's version of the method is executed, even if the method is being called on a reference of the superclass type. This allows for dynamic method dispatch, where the method that is invoked is determined at runtime based on the actual object that is being referenced, not the type of the reference variable.

This capability is essential for achieving runtime polymorphism in Java and is used extensively in frameworks and applications that implement interfaces and subclass functionalities. By allowing subclasses to override methods, Java promotes code reusability and maintainability, enabling developers to build on existing code without altering the original functionality in the superclass.