Object-Oriented Programming (OOP) in Java Quiz

Explore essential Java OOP concepts with 16 questions. From encapsulation to polymorphism, challenge your skills now!

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What is the default access modifier for members of a class if no access modifier is specified?

public

protected

private

package-private

9 answered

What is a static method in Java?

A method that can be called on an instance of a class.

A method that cannot access instance variables of a class.

A method that belongs to the class rather than any specific instance.

A method that cannot be overridden.

6 answered

Which of the following is not a valid access modifier in Java?

public

protected

internal

private

3 answered

What is method overloading in Java?

The process of defining multiple methods with the same name but different parameters.

The process of defining a method that cannot be overridden.

The process of hiding the implementation details of a class.

The process of accessing static variables of a class.

3 answered

Which keyword is used to prevent a method from being overridden in Java?

static

final

abstract

private

3 answered

What is a constructor in Java?

A method used to create a new instance of a class.

A method that cannot have parameters.

A method that can be overridden.

A method that returns a value.

4 answered

Which of the following best describes encapsulation in Java?

It is a technique to define the blueprint for a class.

It is a mechanism to restrict access to certain class members.

It is a way to create multiple instances of a class.

It is a process of hiding the implementation details of a class and only showing the necessary features of the class.

4 answered

What is the purpose of 'super' keyword in Java?

To call the constructor of the superclass.

To access static variables of the superclass.

To override a method from the superclass.

To create an instance of the superclass.

4 answered

What is the purpose of the 'this' keyword in Java?

To refer to the current instance of the class.

To create a new instance of the class.

To call the superclass constructor.

To access static variables of the class.

3 answered

#10

What is polymorphism in Java?

The ability of a method to behave differently based on the object it is called on.

The process of hiding the implementation details of a class.

The process of combining data and methods into a single unit.

The process of defining multiple methods with the same name but different parameters.

4 answered

#11

What is the purpose of the 'final' keyword in Java?

To define a method that cannot be overridden.

To define a class that cannot be extended.

To define a variable that cannot be reassigned.

To define a method that cannot be accessed from outside the class.

3 answered

#12

What does the 'instanceof' operator do in Java?

It checks if an object is an instance of a particular class.

It converts an object to an instance of a specified class.

It checks if two objects are equal in value.

It checks if an object is null.

3 answered

#13

Which of the following statements is true about method overriding in Java?

The return type of the overriding method must be the same as the overridden method.

The overriding method can have a broader access modifier than the overridden method.

The final methods cannot be overridden.

The static methods can be overridden.

4 answered

#14

What is the difference between abstraction and encapsulation?

Abstraction is the process of hiding the implementation details of a class, while encapsulation is the ability to define a blueprint for a class.

Abstraction is the ability to create multiple instances of a class, while encapsulation is the process of defining multiple methods with the same name but different parameters.

Abstraction is the process of defining a blueprint for a class, while encapsulation is the process of hiding the implementation details of a class.

Abstraction is the process of combining data and methods into a single unit, while encapsulation is the process of restricting access to certain class members.

3 answered

#15

Which of the following is true about interfaces in Java?

Interfaces can have instance variables.

A class can implement multiple interfaces.

Interfaces can have constructors.

Interfaces can be instantiated using the 'new' keyword.

3 answered

#16

Which of the following statements about interfaces in Java is true?

Interfaces can contain instance variables.

A class can implement multiple interfaces with conflicting method signatures.

Interfaces can have constructors.

Interfaces can be instantiated using the 'new' keyword.

2 answered

Object-Oriented Programming (OOP) in Java Quiz

What is the default access modifier for members of a class if no access modifier is specified?

What is a static method in Java?

Which of the following is not a valid access modifier in Java?

What is method overloading in Java?

Which keyword is used to prevent a method from being overridden in Java?

What is a constructor in Java?

Which of the following best describes encapsulation in Java?

What is the purpose of 'super' keyword in Java?

What is the purpose of the 'this' keyword in Java?

What is polymorphism in Java?

What is the purpose of the 'final' keyword in Java?

What does the 'instanceof' operator do in Java?

Which of the following statements is true about method overriding in Java?

What is the difference between abstraction and encapsulation?

Which of the following is true about interfaces in Java?

Which of the following statements about interfaces in Java is true?

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