Method Overriding Quiz: Test Your Knowledge of Java

📚 Quick Study Guide

• 🔑 Method overriding allows a subclass to provide a specific implementation of a method that is already defined in its superclass.
• 🖋️ The method signature (name and parameters) in the subclass must be exactly the same as the method in the superclass.
• Accesibility cannot be more restrictive. For example, if the superclass method is `protected`, the overriding method in the subclass cannot be `private`. It can be `protected` or `public`.
• 📍 Use the `@Override` annotation to ensure that you are actually overriding a method and not simply defining a new one. This helps catch errors at compile time.
• ⚙️ Overridden methods allow for runtime polymorphism, where the correct method to call is determined at runtime based on the actual object type.
• 🔗 If a method cannot be inherited, it cannot be overridden. This includes methods declared as `final` or `static`.
• 📐 The return type of the overriding method must be the same as (or a covariant subtype of) the return type of the overridden method.

Practice Quiz

1. Question 1: What is method overriding in Java?
   1. A) Creating a new method with the same name but different parameters in the same class.
   2. B) Creating a method with the same name and parameters in a subclass to provide a specific implementation.
   3. C) Hiding a method from the superclass.
   4. D) Overloading a method in the same class.
2. Question 2: Which annotation is used to ensure a method is correctly overriding a superclass method?
   1. A) `@Override`
   2. B) `@Overload`
   3. C) `@Super`
   4. D) `@Implement`
3. Question 3: What happens if the overriding method has a more restrictive access modifier than the overridden method?
   1. A) It compiles without any errors.
   2. B) It results in a compile-time error.
   3. C) It works, but the method cannot be accessed from the superclass.
   4. D) It results in a runtime error.
4. Question 4: Can a `static` method be overridden?
   1. A) Yes, always.
   2. B) No, never.
   3. C) Yes, but only if the subclass is in the same package.
   4. D) Yes, but only if the superclass method is public.
5. Question 5: What is the purpose of method overriding?
   1. A) To hide the implementation details of the superclass.
   2. B) To provide a specific implementation of a method in a subclass.
   3. C) To improve the performance of the superclass methods.
   4. D) To create multiple methods with the same name in a class.
6. Question 6: What must be the same between the overriding and overridden methods?
   1. A) Only the method name.
   2. B) Only the return type.
   3. C) The method name and parameter list.
   4. D) The method name and access modifier.
7. Question 7: If a method in the superclass is declared as `final`, can it be overridden in the subclass?
   1. A) Yes, always.
   2. B) No, never.
   3. C) Yes, but only if the subclass is in the same package.
   4. D) Yes, but only if the superclass method is public.