Infosys Interview Questions, Process, and Tips for Experienced

A simple example of a Get API

• Use a HTTP GET request to retrieve data from a server

• Include the endpoint URL in the request

• Handle the response data accordingly

A final class is a class that cannot be subclassed or extended.

• Final classes are declared using the 'final' keyword in Java.

• Final classes cannot have any subclasses.

• Final classes are often used for utility classes or classes that should not be modified or extended.

A static class is a class that cannot be instantiated and can only contain static members.

• Static classes are used to group related methods and properties that do not require an instance of the class to be created.

• Static classes are declared using the 'static' keyword in C#.

• Static classes cannot be instantiated and cannot contain instance members.

• Example: 'Math' class in C# is a static class that contains static methods

OOPS concepts are the foundation of object-oriented programming, including principles like inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the compl...read more

Abstract class is a class that can have both abstract and non-abstract methods, while interface is a contract that defines methods that a class must implement.

• Abstract class can have constructors, fields, and non-abstract methods.

• Interface can only have abstract methods and constants.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract class is used to provide a common base fo...read more

Public, private, and protected are access modifiers in object-oriented programming languages.

• Public: accessible from anywhere, both within and outside the class

• Private: only accessible within the class where it is declared

• Protected: accessible within the class and its subclasses

RestController is a specialized version of Controller in Spring framework for RESTful web services.

• RestController is used for creating RESTful web services in Spring framework.

• Controller is used for handling general web requests.

• RestController automatically serializes and deserializes request and response bodies as JSON.

• Controller can return any type of response, not just JSON.

• Example: @RestController vs @Controller in

Legal obligations refer to the responsibilities and duties that individuals or organizations are required to fulfill under the law.

• Compliance with relevant laws and regulations

• Protection of confidential information

• Adherence to contractual agreements

• Respect for intellectual property rights

• Ensuring workplace safety and health standards

• Proper handling of customer data and privacy

I led a team in developing a Java project for a financial institution.

• Developed a secure online banking platform using Java EE

• Implemented features such as account management, transaction history, and fund transfers

• Utilized Spring framework for dependency injection and Hibernate for database interaction

List and Tuple differences, ordering, indexing, and iteration

• List is mutable, Tuple is immutable

• Lists are ordered and indexed starting from 0, Tuples are also ordered but indexed starting from 0

• Iterating through a List: for item in my_list: print(item)

• Iterating through a Tuple: for item in my_tuple: print(item)

Decorator pattern allows adding new functionality to an object dynamically.

• Decorator pattern involves adding new behaviors to objects by wrapping them in another object.

• It allows for adding functionality without altering the original object.

• Example: Adding logging functionality to a method by decorating it with a logging decorator.

Generate prime numbers from 1 to n

• Iterate from 2 to n and check if each number is prime

• Use a boolean array to mark non-prime numbers

• Optimize by only checking up to square root of n