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OOPs Questions
3 followers study24x7 22 Jul 2024 12:13 PM study24x7 study24x7

What is the difference between private, protected, and public access modifiers in OOPs?
Ans. Access modifiers in OOP are used to control the visibility and accessibility of class members (variables, methods, and nested classes) from other cla...

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3 followers study24x7 22 Jul 2024 12:08 PM study24x7 study24x7

What is a factory pattern, and when is it used?
Ans. Factory Pattern is a creational design pattern that provides an interface for creating objects, but allows subclasses to alter the type of objects that will be created. It is used when we w...

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3 followers study24x7 22 Jul 2024 12:05 PM study24x7 study24x7

Give an example of parameterized constructor in Java.
Ans. Example of a parameterized constructor in Java: public class Person { private String name; private int age; public Person(String name, int age) { this.name = name...

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3 followers study24x7 19 Jul 2024 10:02 AM study24x7 study24x7

What is a singleton pattern, and when is it used?
Ans. Singleton Pattern is a creational design pattern that is used when we want to ensure that only one instance of a class is created and that the instance can be easily accessed throughout t...

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3 followers study24x7 19 Jul 2024 10:01 AM study24x7 study24x7

What is a design pattern, and can you name a few commonly used design patterns?
Ans. A design pattern is a general, reusable solution to a commonly occurring problem in software design. Design patterns provide a template for solving problems ...

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3 followers study24x7 19 Jul 2024 09:58 AM study24x7 study24x7

What are the different types of polymorphism? br>Ans. There are two types of polymorphism: static and dynamic. a) Static polymorphism Also known as compile-time polymorphism, the static polymorphism in OOP is achieved through me...

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3 followers study24x7 18 Jul 2024 01:15 PM study24x7 study24x7

Share an example that shows the difference between instance and class variables in OOPs.
Ans. Here’s an example that illustrates the difference between instance variables and class variables: public class MyClass { private int instance...

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3 followers study24x7 18 Jul 2024 01:14 PM study24x7 study24x7

What is the role of the final keyword in Java?
Ans. The final keyword is used to define entities (variables, methods, and classes) that cannot be changed or overridden. Here are the different uses of the final keyword in Java: a) F...

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3 followers study24x7 18 Jul 2024 01:13 PM study24x7 study24x7

What are the four fundamental principles of OOPs?
Ans. The four fundamental principles of Object-Oriented Programming (OOPs) are: Encapsulation Inheritance Polymorphism Abstraction

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3 followers study24x7 17 Jul 2024 07:27 PM study24x7 study24x7

What is a package in Java?
Ans. In Java, a package is a mechanism for organising related classes and interfaces into a single unit. It provides a way to group related classes and interfaces together in a logical manner, and also provides a wa...

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3 followers study24x7 17 Jul 2024 07:25 PM study24x7 study24x7

What is the difference between an instance variable and a class variable?
Ans. In object-oriented programming, instance variables and class variables are two types of variables that can be declared within a class. The main difference between them is that instance variables ...

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3 followers study24x7 17 Jul 2024 07:24 PM study24x7 study24x7

What is a static variable?
Ans. In Java, a static variable is a variable that belongs to the class rather than to any instance of the class. This means that all instances of the class share the same static variable, and changes to the static ...

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3 followers study24x7 16 Jul 2024 12:54 PM study24x7 study24x7

What is a static method?
Ans. A static method in Java is a method that belongs to the class rather than to any instance of the class. This means that you can call a static method without creating an instance of the class first. You can call i...

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3 followers study24x7 16 Jul 2024 12:49 PM study24x7 study24x7

What is a destructor?
Ans. In Java and some other object-oriented programming languages, there is no such thing as a destructor. Instead, these languages rely on garbage collection to automatically reclaim memory that is no longer being used ...

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3 followers study24x7 16 Jul 2024 12:46 PM study24x7 study24x7

What are the different types of constructors?
Ans. There are two types of constructors: a) Default constructor This constructor is provided by Java if a class does not have any constructors explicitly defined. It takes no p...

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3 followers study24x7 15 Jul 2024 11:59 AM study24x7 study24x7

What is a constructor?
Ans. A constructor in OOP is a special method that is called when an object is created. Its main purpose is to initialise the object’s state or data members with some initial values. In Java, a constructor has the sa...

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3 followers study24x7 15 Jul 2024 11:45 AM study24x7 study24x7

What is method overriding? Explain with an example.
Ans. It is a form of dynamic polymorphism that allows a subclass to provide its own implementation of a method that is already defined in its superclass. When a method is called on an obje...

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3 followers study24x7 15 Jul 2024 11:43 AM study24x7 study24x7

What is method overloading? Explain with an example.
Ans. It is a form of static polymorphism that allows multiple methods to have the same name but with different parameters or argument types. When an overloaded method is called, the compiler determines which method to cal...

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3 followers study24x7 10 Jul 2024 10:09 AM study24x7 study24x7

What is polymorphism in OOPs?
Ans. Polymorphism is a fundamental concept in Object-Oriented Programming (OOP) that allows objects of different classes to be treated as if they are objects of a common superclass or interface. It enables the s...

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3 followers study24x7 10 Jul 2024 10:09 AM study24x7 study24x7

What is an abstraction in OOPs?
Ans. It is the process used to define a simplified interface or model that represents the essential features of an object, without including unnecessary details or implementation specifics. Abstraction helps t...

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