Starcentauri Technologies Interview Questions, Process, and Tips

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.
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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
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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
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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.
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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
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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
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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
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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
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Q4. Interviewer ask me to write CRUD operation in Spring Boot
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Q5. Asked about project
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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
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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
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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.
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