Java Oop Questions


Java Oop Questions

Questions on Object-Oriented Programming in Java

Java Oop Questions

In Java OOP (Object-Oriented Programming) interviews, you can expect questions related to the fundamental concepts of OOP such as inheritance, encapsulation, polymorphism, and abstraction. Interviewers may ask you to explain these concepts and provide examples of how they are implemented in Java code. You may also be asked about the difference between abstract classes and interfaces, as well as how to create and use them in Java. Additionally, questions about access modifiers, constructors, static keyword, and design patterns may also be commonly asked in Java OOP interviews. It is important to have a solid understanding of these concepts and be able to demonstrate your knowledge through coding examples and explanations.

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1 - What is object oriented programming (OOP)?

Answer: Object oriented programming (OOP) is a programming paradigm that focuses on modeling real world entities as objects, which have attributes (data) and behaviors (methods). OOP promotes the concept of encapsulation, inheritance, and polymorphism to structure code in a more organized and reusable way.

2) What is a class in Java?

Answer: A class in Java is a blueprint or template that defines the properties and behaviors that objects of that class will have. It serves as a blueprint for creating objects.

3) What is an object in Java?

Answer: An object in Java is an instance of a class. It represents a real world entity and has its own state (attributes) and behavior (methods).

4) What is encapsulation in Java?

Answer: Encapsulation is the concept of bundling data (attributes) and methods (behaviors) that operate on the data within a class. It ensures that the data is kept private and can only be accessed through public methods, promoting data hiding and security.

5) What is inheritance in Java?

Answer: Inheritance is a mechanism in Java that allows a class to inherit properties and behaviors from another class. It promotes code reusability and establishes an “is a” relationship between classes.

6) What is polymorphism in Java?

Answer: Polymorphism is the ability of an object to take on different forms and behaviors based on the context in which it is used. In Java, polymorphism can be achieved through method overloading and method overriding.

7) What is a constructor in Java?

Answer: A constructor in Java is a special type of method that is called when an object of a class is created. It is used to initialize the newly created object and can have parameters to provide initial values to the object's attributes.

8) What is method overloading in Java?

Answer: Method overloading in Java refers to the ability to define multiple methods in a class with the same name but different parameters. The compiler determines which method to call based on the number and types of arguments passed to it.

9) What is method overriding in Java?

Answer: Method overriding in Java allows a subclass to provide a specific implementation of a method that is already defined in its superclass. It is used to achieve runtime polymorphism and to create specialized behavior for subclasses.

10) What is the difference between abstract class and interface in Java?

Answer: An abstract class in Java can have both abstract (unimplemented) and concrete (implemented) methods, while an interface can only have abstract methods. A class can implement multiple interfaces but can extend only one abstract class.


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