10+ Interview Questions and Answers

JavaScript is a programming language used to create interactive web pages and web applications.

• JavaScript is a client-side scripting language

• It can be used for form validation, creating animations, and manipulating HTML and CSS

• JavaScript can also be used on the server-side with Node.js

• Popular JavaScript frameworks include React, Angular, and Vue.js

A constructor is a special method in a class that is automatically called when an object of that class is created.

• A constructor typically initializes the object's properties or performs any necessary setup.

• It is called automatically when an object is created using the 'new' keyword.

• Constructors do not get called without creating an object.

Java is a popular programming language known for its versatility and platform independence.

• Java is an object-oriented programming language used for developing a wide range of applications, from web and mobile apps to enterprise systems.

• It is platform-independent, meaning that Java code can run on any device that has a Java Virtual Machine (JVM) installed.

• Java is known for its security features, which help protect against viruses and other malicious attacks.

• It has a large stan...read more

Abstract class in Java is a class that cannot be instantiated and may contain abstract methods.

• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Can have both abstract and non-abstract methods

• Used for creating a template for other classes to extend

Token generation and authentication process is a security mechanism used to verify the identity of a user.

• Token generation involves creating a unique token for each user upon successful login.

• The token is then stored in the user's browser or device.

• When the user makes subsequent requests, the token is sent along with the request.

• The server then verifies the token to authenticate the user.

• If the token is valid, the user is granted access to the requested resource.

• Examples of t...read more

One of the design patterns is the Singleton pattern.

• Singleton pattern ensures that only one instance of a class is created and provides a global point of access to it.

• It is useful when we need to limit the number of instances of a class to one.

• Example: Database connection class, where we need only one instance of the class to connect to the database.

• Another example is the Logger class, where we need only one instance to log messages throughout the application.

Constructor is a special method that is called when an object is created.

• It has the same name as the class it belongs to

• It can take parameters to initialize the object's properties

• It can be overloaded to have multiple constructors with different parameters

Inheritance in Java allows a class to inherit properties and behavior from another class.

• Inheritance is a mechanism in which a new class acquires the properties and behaviors of an existing class.

• The class that is inherited from is called the superclass or parent class, and the class that inherits is called the subclass or child class.

• Subclasses can override methods from the superclass to provide their own implementation.

• Inheritance promotes code reusability and allows for cr...read more

Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.

• Start with 0 and 1 as the first two numbers in the series

• Add the previous two numbers to get the next number in the series

• Repeat this process to generate the Fibonacci series

Program to find the nth day from today

• Get the current date using a date object

• Add the number of days to the current date to find the nth day

• Return the nth day as the output

Deletion logic for a linked list

• Traverse the linked list to find the node to be deleted

• Update the pointers of the previous and next nodes to skip the node to be deleted

• Free the memory of the node to be deleted