Starcentauri Technologies Interview Questions and Answers

Technical Aptitude for first round

Q1. What is Spring Boot ?
Ans. 
Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and tools.
• Spring Boot eliminates the need for manual configuration by providing defaults for most settings.

• It allows developers to quickly set up and run standalone Spring-based applications.

• Spring Boot includes embedded servers like Tomcat, Jetty, or Undertow for easy deployment.

• It promotes convention o...read more
Answered by AI
Add your answer
Q2. What annotations we used in spring boot?
Ans. 
Various annotations are used in Spring Boot for different purposes.
• 1. @RestController - Used to define RESTful web services.

• 2. @RequestMapping - Maps web requests to specific handler methods.

• 3. @Autowired - Injects dependencies into a Spring bean.

• 4. @Component - Indicates a class is a Spring component.

• 5. @Service - Indicates a class is a Spring service.

• 6. @Repository - Indicates a class is a Spring repository.

• 7. @Confi...read more
Answered by AI
Add your answer
Q3. What is Multi Threading?
Ans. 
Multi Threading is the ability of a CPU to execute multiple threads concurrently, allowing for better performance and responsiveness.
• Allows multiple tasks to run concurrently within a single process

• Improves performance by utilizing CPU resources efficiently

• Can lead to synchronization issues if not handled properly

• Examples: running multiple tasks simultaneously in a web server, processing data in parallel
Answered by AI
Add your answer
Q4. Interviewer ask me to write CRUD operation in Spring Boot
Ans. 
Implementing CRUD operations in Spring Boot involves creating RESTful APIs for data management.
• 1. Create a Spring Boot project using Spring Initializr with dependencies: Spring Web, Spring Data JPA, and H2 Database.

• 2. Define an entity class, e.g., 'User', with fields like id, name, and email.

• 3. Create a repository interface extending JpaRepository<User, Long> for database operations.

• 4. Implement a service class t...read more
Answered by AI
Add your answer
Q5. Asked about project
Add your answer
Q6. What is oops concept?
Ans. 
OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
• OOPs focuses on creating objects that interact with each other to solve a problem.

• Key principles of OOPs include Inheritance, Encapsulation, Polymorphism, and Abstraction.

• Inheritance allows a class to inherit properties and behavior from another cl...read more
Answered by AI
Add your answer

Basic Logical Reasoning Like Checking the logic of problem solving

Maximum 60 minutes for coding round.
Minimum 3-4 coding questions.

Q1. Discussion of salary and HR manager checks the background of the candidates
Add your answer
Q2. What is your expected Salay? Why we will select you in our company?
Ans. 
I expect a competitive salary based on my skills and experience.
• I have extensive experience in Java backend development.

• I have a strong understanding of data structures and algorithms.

• I have successfully delivered complex projects on time and within budget.

• I am a quick learner and adapt easily to new technologies.

• I am a team player and can effectively collaborate with cross-functional teams.
Answered by AI
Add your answer

Java, Spring Boot, Lambda expression, Collection framework

Q1. Explain annotations used in spring boot ?
Ans. 
Annotations in Spring Boot are used to provide metadata and configuration to the application.
• Annotations are used to define the behavior of various components in a Spring Boot application.

• They can be used to configure dependency injection, define request mappings, handle exceptions, etc.

• Some commonly used annotations in Spring Boot include @RestController, @Autowired, @RequestMapping, @ExceptionHandler, etc.
Answered by AI
Add your answer
Q2. Explain polymorphism.
Ans. 
Polymorphism is the ability of an object to take on many forms, allowing objects of different classes to be treated as the same type.
• Polymorphism allows objects to be used interchangeably with other objects of the same superclass.

• It enables code reusability and flexibility in object-oriented programming.

• Polymorphism can be achieved through method overriding and method overloading.

• Example: A superclass 'Animal' with sub...read more
Answered by AI
Add your answer
Q3. Explain rest-template.
Ans. 
RestTemplate is a class in Spring Framework that simplifies making HTTP requests and handling responses.
• RestTemplate is part of the Spring Web module.

• It provides methods to send HTTP requests and receive responses.

• It supports various HTTP methods like GET, POST, PUT, DELETE, etc.

• RestTemplate can handle different data formats like JSON, XML, etc.

• It can be used to consume RESTful APIs and interact with external services.

• ...read more
Answered by AI
Add your answer
Q4. What is stack ?
Ans. 
A stack is a data structure that follows the Last-In-First-Out (LIFO) principle.
• Elements are added and removed from the top of the stack.

• Common operations include push (add element) and pop (remove element).

• Stacks are used in function calls, undo/redo functionality, and expression evaluation.
Answered by AI
Add your answer
Q5. Explain abstraction in java.
Ans. 
Abstraction in Java is the process of hiding the implementation details and providing only the essential features to the user.
• Abstraction allows programmers to focus on the essential aspects of an object and ignore the irrelevant details.

• It is achieved using abstract classes and interfaces in Java.

• Abstract classes cannot be instantiated and can have both abstract and non-abstract methods.

• Interfaces define a contract fo...read more
Answered by AI
Add your answer