Method Overriding: A Comprehensive Guide for Object-Oriented Programming

Question 1

In object-oriented programming, what is the definition of method overriding?

Accepted Answer

Redefining a method in a subclass with the same name, signature, and return type as a method in the superclass

Answer

Using the same method name in different classes with the same signature

Answer

Changing the return type of a method in a subclass with the same name as a method in the superclass

Answer

Implementing an abstract method in a subclass

Question 2

To indicate method overriding in the subclass method declaration, which keyword is necessary?

Accepted Answer

override

Answer

extend

Answer

replace

Answer

inherit

Question 3

Which of these is NOT a feature of method overriding?

Accepted Answer

Subclass method can have a different return type

Answer

Matching method signature with the overridden method

Answer

Subclass method can have a more restrictive access modifier

Answer

Subclass method must provide a distinct implementation

Question 4

What's the primary purpose of overriding methods?

Accepted Answer

Providing specialized implementations of inherited methods

Answer

Creating new methods in the subclass

Answer

Inheriting methods from the superclass

Answer

Preventing methods from being inherited

Question 5

Which statement about method overriding is accurate?

Accepted Answer

Subclass method can invoke the overridden method using 'super'

Answer

Overridden method is hidden from the subclass

Answer

Overridden method cannot be called from the subclass

Answer

Subclass method must have the same number of parameters

Question 6

Which method is a valid example of overriding?

Accepted Answer

public void printMessage(String message) { ... }

Answer

public static void printMessage() { ... }

Answer

private void printMessage() { ... }

Answer

final void printMessage() { ... }

Question 7

What happens if a subclass overrides a superclass method but doesn't implement it?

Accepted Answer

Subclass method results in a compilation error

Answer

Subclass method inherits the implementation from the superclass

Answer

Subclass method becomes abstract

Answer

Subclass method calls the superclass method by default

Question 8

In object-oriented programming, what is the main purpose of method overriding?

Accepted Answer

To implement multiple, specialized versions of the same method in different subclasses

Answer

To allow subclasses to access private methods defined in their superclasses

Answer

To prevent subclasses from using methods defined in their superclasses

Answer

To ensure that methods are always executed in a consistent order across all subclasses

Question 9

Is method overriding a form of polymorphism?

Accepted Answer

Yes

Answer

No

Question 10

In object-oriented programming, what is the primary purpose of method overriding?

Accepted Answer

A subclass redefines an inherited method with the same signature, providing a specialized implementation.

Answer

A subclass modifies the signature of an inherited method, altering its parameters or return type.

Answer

Method overriding is restricted to private methods, ensuring encapsulation and limiting access from outside the class.

Question 11

Which of the following techniques is used to implement method overriding in Java?

Accepted Answer

Using the '@Override' annotation

Answer

Using the 'extends' keyword

Answer

Using the 'super' keyword

Answer

Using the 'interface' keyword

Question 12

What is the primary purpose of method overriding?

Accepted Answer

Polymorphism

Answer

Encapsulation

Answer

Abstraction

Answer

Inheritance

Question 13

When a subclass overrides a method from its superclass, what is the accessibility of the original implementation in the superclass?

Accepted Answer

It is still accessible using the 'super' keyword

Answer

It is hidden and not accessible anymore

Answer

It is duplicated in the subclass

Answer

It is deleted and no longer exists

Question 14

Which of the following is not a valid constraint on method overriding?

Accepted Answer

The overridden method can return a different data type

Answer

The overridden method must have the same name and parameter list

Answer

The overridden method must have the same or wider access modifier

Answer

The overridden method must throw the same or fewer exceptions

Question 15

What is the purpose of using the 'final' keyword in the context of method overriding?

Accepted Answer

It prevents the method from being overridden in subclasses

Answer

It ensures that the overridden method has the same implementation in all subclasses

Answer

It makes the method accessible only within the current class

Answer

It has no effect on method overriding

Question 16

When overriding a method that throws an exception, what is the rule regarding the overridden method's exception?

Accepted Answer

It must throw the same exception or a subtype of it

Answer

It can throw a different exception

Answer

It cannot throw an exception

Answer

It must throw an exception if the overridden method does not

Question 17

Which of the following scenarios represents an appropriate use of method overriding?

Accepted Answer

Overriding a method to add additional functionality

Answer

Overriding a method to change its parameter list

Answer

Overriding a method to make it less efficient

Answer

Overriding a method to remove its functionality

Question 18

What is a primary benefit of method overriding in object-oriented programming?

Accepted Answer

Increased code flexibility and extensibility

Answer

Enhanced code readability

Answer

Reduced memory footprint

Question 19

Which of the following is NOT a benefit of method overriding?

Accepted Answer

Increasing code readability

Answer

Extending the functionality of methods inherited from superclasses

Answer

Reducing code duplication

Answer

Improving code flexibility

Question 20

Which of the following is a valid signature for an overridden method in Java?

Accepted Answer

protected void myMethod(int x)

Answer

public static void myMethod()

Answer

private static void myMethod()

Answer

public abstract void myMethod()

Question 21

Which of the following is NOT a limitation of method overriding?

Accepted Answer

It promotes code reusability.

Answer

It can lead to inconsistencies if not used properly.

Answer

It can make it difficult to understand the overridden method's behavior.

Answer

It can introduce runtime errors.

Question 22

What happens if the superclass method being overridden is declared final?

Accepted Answer

The subclass cannot override the method.

Answer

The subclass can override the method, but it must also be declared final.

Answer

The subclass can override the method, but it cannot be declared final.

Answer

The subclass can override the method, and it can be declared final or not.

Question 23

Which Java annotation can be used to indicate that a method should not be overridden in subclasses?

Accepted Answer

@NonOverride

Answer

@Override

Answer

@Final

Answer

@Immutable

Question 24

In object-oriented programming, when a subclass overrides a method from its superclass, what happens to the inheritance hierarchy?

Accepted Answer

The subclass method overrides the superclass method, and the subclass method is called by default. However, the superclass method can still be called explicitly using super.

Answer

The superclass method is no longer accessible.

Answer

The subclass method replaces the superclass method, and the superclass method is never called.

Answer

The subclass method is added to the inheritance hierarchy without overriding the superclass method.

Question 25

How does method overriding facilitate dynamic binding in object-oriented programming?

Accepted Answer

It allows subclasses to define methods with the same name as those in the superclass, enabling polymorphic behavior.

Answer

It ensures that all methods in a class hierarchy share the same implementation.

Answer

It restricts subclasses from accessing protected methods of the superclass.

Answer

It is used to create abstract classes that cannot be instantiated.

Question 26

How does method overriding impact data encapsulation and field visibility?

Accepted Answer

Method overriding upholds field visibility, allowing methods to access only visible fields.

Answer

Method overriding can alter the visibility of fields in the subclass.

Answer

Method overriding can expand field visibility in the subclass, granting access to fields not visible in the superclass.

Question 27

What is the purpose of the @Override annotation in Java?

Accepted Answer

It indicates that the method is intended to override an existing method in the superclass.

Answer

It prevents the method from being overridden in subclasses.

Answer

It allows the method to be accessed from any class.

Answer

It has no effect on the method's functionality.

Question 28

Which of the following is NOT a factor to consider when deciding whether to override a method?

Accepted Answer

The return type of the method in the subclass

Answer

The purpose of the method in the superclass

Answer

The visibility of the method in the superclass

Answer

The finality of the method in the superclass

Question 29

What term describes a method in a subclass that has the same name and signature as a method in a superclass but implements different functionality?

Accepted Answer

Method overriding

Answer

Method overloading

Answer

Method hiding

Answer

Method polymorphism

Question 30

True or False: Method overriding can be used to implement polymorphism in Java.

Accepted Answer

True

Answer

False

Question 31

Which of the following is a primary benefit of method overriding?

Accepted Answer

Specialization of method implementation in subclasses

Answer

Increased code reusability

Answer

Reduced code complexity

Question 32

How do the method signature and method body of an overriding method relate?

Accepted Answer

The method signature must match the superclass method's signature, while the method body can be modified.

Answer

Both the method signature and method body must be identical to the superclass method.

Answer

The method body must match the superclass method's body, while the method signature can be modified.

Question 33

When is method overriding valid?

Accepted Answer

When a subclass defines a method with the same name and method signature as a method in the superclass.

Answer

When a subclass defines a method with a different name but the same method signature as a method in the superclass.

Question 34

What is the function of the 'super' keyword in method overriding?

Accepted Answer

To invoke the overridden method from the superclass within the overriding method.

Answer

To create a new instance of the superclass.

Answer

To pass arguments to the overriding method from the superclass method.

Question 35

What happens when an overridden method is invoked through a reference variable of the superclass type?

Accepted Answer

The overridden method from the subclass is executed.

Answer

The original method from the superclass is executed.

Answer

A compile-time error occurs.

Question 36

Where should you override a method if you want the overriding method to be accessible to all subclasses?

Accepted Answer

In the nearest superclass that defines the method.

Answer

In the superclass that is the highest in the hierarchy.

Answer

In the subclass that is the lowest in the hierarchy.

Question 37

How does polymorphism relate to method overriding?

Accepted Answer

It enables objects of different subclasses to respond differently to the same method call.

Answer

It improves code readability and maintainability.

Answer

It allows the creation of abstract classes and interfaces.

Question 38

Which of the following is **not** a benefit of method overriding?

Accepted Answer

Code reusability is **not** decreased by method overriding.

Answer

Enhances polymorphism

Answer

Provides specialized implementations

Answer

Improves code maintainability

Question 39

Which of the following is a potential limitation of method overriding?

Accepted Answer

Method overriding can lead to unintended behavior if the overriding method does not correctly implement the intended functionality.

Answer

Simplifies code structure

Answer

Encourages code reuse

Answer

Improves performance

Question 40

What is the key difference between method overriding and method overloading?

Accepted Answer

Method overriding involves providing a specialized implementation of an existing method, while method overloading involves creating multiple methods with the same name but different parameters.

Answer

Overriding changes the method signature, while overloading maintains the same signature

Question 41

In which scenario is it appropriate to use method overriding?

Accepted Answer

Method overriding is suitable when a subclass needs to provide a specialized implementation of a method inherited from its superclass.

Answer

When the method implementation in the superclass needs to be removed

Question 42

What happens if a method is overridden in a subclass but is not invoked using an object of that subclass?

Accepted Answer

If an overridden method is not invoked using an object of the subclass, the method implementation in the superclass will be executed.

Answer

The program will crash

Answer

An error will be thrown at runtime

Question 43

Which of the following is a recommended best practice for method overriding?

Accepted Answer

When overriding a method, ensure that the overriding method does not break the contract defined by the superclass method.

Answer

Always override methods declared as final

Answer

Use the @Override annotation to mark overridden methods

Question 44

What is the primary purpose of the "super" keyword when overriding methods?

Accepted Answer

The "super" keyword allows you to access the implementation of the method in the superclass.

Answer

To create a new object of the superclass

Answer

To cast the object to the superclass type

Question 45

True or False: Method overriding allows subclasses to define **new** methods with the same name as existing methods in the superclass.

Accepted Answer

False. Method overriding does **not** allow subclasses to define new methods with the same name as existing methods in the superclass. It only allows them to provide specialized implementations of inherited methods.

Answer

It depends on the access modifier of the superclass method

Answer

Only if the superclass method is declared as abstract

Answer

True

Question 46

Which of the following is the correct syntax for overriding a method in Java?

Accepted Answer

@Override public void myMethod()

Answer

public void MyMethod()

Answer

protected void myMethod()

Answer

override public void MyMethod()

Question 47

What is the primary benefit of method overriding?

Accepted Answer

Allows subclasses to define specialized implementations of inherited methods

Answer

Improves program performance

Answer

Enforces data encapsulation

Answer

Reduces code duplication

Question 48

Which of the following statements about method overriding is true?

Accepted Answer

The overriding method must have the same name, return type, and parameter list as the overridden method.

Answer

The overriding method can only be declared in child classes.

Answer

The overriding method can have a different return type than the overridden method.

Question 49

What is the fundamental difference between method overriding and method overloading?

Accepted Answer

Method overriding replaces the superclass implementation, while method overloading provides multiple implementations within the same class

Answer

Overriding methods have the same name but different parameters, while overloaded methods have the same name and parameters

Answer

Method overriding is used for inheritance, while method overloading is used for polymorphism

Question 50

What is a key advantage of method overriding?

Accepted Answer

Provides flexibility for subclasses to customize inherited behavior

Answer

Eliminates the need for inheritance

Answer

Increases code readability

Question 51

When is it appropriate to use method overriding?

Accepted Answer

When a subclass requires a different implementation of an inherited method

Answer

When new methods need to be created in the subclass

Answer

When attempting to fix errors in superclass methods

Question 52

What occurs if you attempt to override a method declared final in the superclass?

Accepted Answer

Compilation error

Answer

Warning message

Answer

Runtime error

Answer

No effect

Question 53

Which of the following is NOT a recommended practice for method overriding?

Accepted Answer

Changing the return type of the overridden method

Answer

Calling the superclass implementation

Answer

Using the same method signature

Answer

Documenting the overridden method

Question 54

What is the main purpose of the @Override annotation when overriding a method?

Accepted Answer

To ensure that the method is actually overriding a superclass method

Answer

To indicate that the method should be called first

Answer

To improve code readability

Question 55

Can a private method in a superclass be overridden in a subclass?

Accepted Answer

No

Answer

Yes, if it is declared with the public modifier

Answer

Only if it is declared with the protected modifier

Answer

Yes