Starcentauri Technologies Java Back End Developer Interview Questions and Answers

Q1. Create one Spring boot controller from end to end. No need to create a spring boot project we just want to see the structure and end to end implementation.
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Q2. Write a java 8 program to get the characters from a string whose count is 2 or more than 2 e.g. input: baseball , output: b, a, l.
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Q3. Why you left your previous organization.
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Q4. What is the functional interface
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Q5. What are the OOPS concepts. and some questions related to inheritance.
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Q6. Asked about the project mentioned in CV (Client project) and asked its architecture.
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Q7. Various SQL join types
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Q1. Are you ready to relocate to job location
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Q2. Why are you leaving your previous organization.
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Q3. Expectation about salary
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Q1. How much exp in docker?
Ans. 
I have 2 years of experience working with Docker in various projects.
• 2 years of experience working with Docker in various projects

• Proficient in creating Docker containers, managing images, and orchestrating containers using Docker Compose

• Familiar with Docker Swarm and Kubernetes for container orchestration

• Experience in troubleshooting Docker-related issues and optimizing container performance
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Q2. Do you have exp in Kubernetes?
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Yes, I have experience in Kubernetes.
• I have worked on deploying and managing applications on Kubernetes clusters.

• I am familiar with creating and managing Kubernetes resources such as pods, deployments, services, and ingresses.

• I have experience in using tools like kubectl and Helm for interacting with Kubernetes clusters.

• I have implemented CI/CD pipelines using Kubernetes for automated deployment and scaling of applicat
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Q3. What is OOP?
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OOP stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.
• OOP focuses on creating objects that contain data and methods to manipulate that data.

• Encapsulation, inheritance, and polymorphism are key principles of OOP.

• Examples of OOP languages include Java, C++, and Python.
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Q4. Types of polymorphism
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Polymorphism in Java refers to the ability of a method to do different things based on the object it is acting upon.
• Types of polymorphism in Java include method overloading and method overriding.

• Method overloading is when multiple methods have the same name but different parameters.

• Method overriding is when a subclass provides a specific implementation of a method that is already defined in its superclass.
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Q5. Thread in java
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Threads in Java allow multiple tasks to run concurrently within a single program.
• Threads are lightweight sub-processes that share the same memory space.

• They are used to improve performance by allowing tasks to run simultaneously.

• Examples include creating a new thread using the Thread class or implementing the Runnable interface.
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Q6. Knowledge in which spring modules
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Q7. What is spring profile
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Spring profile is a way to segregate parts of your application configuration and make it only available in certain environments.
• Spring profiles allow you to define different configurations for different environments such as development, testing, and production.

• You can use @Profile annotation to specify which beans should be loaded based on the active profile.

• Profiles can be activated in various ways such as through app...read more
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Q8. What is @PreAuthorize and @PostAuthorize
Ans. 
Annotations used in Spring Security to apply authorization rules before and after a method is called.
• Used in Spring Security to define authorization rules

• @PreAuthorize is used to apply authorization rules before a method is called

• @PostAuthorize is used to apply authorization rules after a method is called

• Both annotations support SpEL expressions for defining rules
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Q1. Java 8 , java 11 and java 17 features?
Ans. 
Java 8 introduced lambda expressions, Java 11 added local-variable syntax for lambda parameters, and Java 17 included sealed classes and pattern matching.
• Java 8 introduced lambda expressions for functional programming.

• Java 11 added local-variable syntax for lambda parameters to simplify code.

• Java 17 included sealed classes to restrict inheritance and pattern matching for instanceof checks and type casts.
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Q2. Dispatcher servlet, design patterns
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Q3. @SpringbootApplication annotation, actuators
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Q4. String Coding question with java 8 features such as lambda function and stream api
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Q5. Number of words in a string
Ans. 
Count the number of words in a given string.
• Split the string by spaces and count the number of resulting elements.

• Handle edge cases like multiple spaces or empty strings.

• Consider punctuation marks as part of words unless specified otherwise.
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Q6. Microservice design patterns
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Q1. Given an array {1, 2, 1, 4, 5, 4, 8, 7}, how can you use Streams to remove duplicates while retaining only the even numbers?
Ans. 
Use Streams to remove duplicates and retain only even numbers from an array.
• Convert the array to a stream using Arrays.stream()

• Use distinct() to remove duplicates

• Filter out odd numbers using filter()

• Collect the result using collect(Collectors.toList())
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Q2. What is the use of Static and final when you will use Static methods
Ans. 
Static methods can be accessed without creating an instance of the class, while final keyword makes the method unchangeable.
• Static methods belong to the class itself, not to any specific instance

• Final keyword ensures that the method cannot be overridden in subclasses

• Static methods are commonly used for utility methods that do not require access to instance variables

• Example: Math class in Java has static methods like Ma
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Q3. What is the difference between @restController and @controller Annotation
Ans. 
The @RestController annotation is used to define RESTful web services while @Controller annotation is used to define MVC controller.
• RestController is a specialized version of Controller used for RESTful web services

• RestController eliminates the need for @ResponseBody annotation

• Controller is used for traditional MVC controller functionality

• RestController returns data directly without needing to go through a view resolve...read more
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Q4. What is microservices why we use it
Ans. 
Microservices are a software development technique where applications are composed of small, independent services that communicate with each other.
• Microservices allow for easier scalability and maintenance of complex applications.

• Each service in a microservices architecture can be developed, deployed, and scaled independently.

• Microservices promote flexibility and agility in software development.

• Examples of companies us...read more
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Q1. What are intermediate and terminal operations
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Q2. Predefined functional interface
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Q3. Ways to create Thread
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Q1. Explain your reasoning
Ans. 
I base my reasoning on data analysis, industry knowledge, and past experiences.
• I analyze data to identify trends and patterns

• I consider industry best practices and standards

• I draw on past experiences to make informed decisions
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Q2. What is in heritance
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Inheritance is the mechanism in which a class can acquire the properties and behavior of another class.
• Inheritance allows a class to inherit attributes and methods from another class.

• The class that is being inherited from is called the parent class or superclass.

• The class that inherits from the parent class is called the child class or subclass.

• Inheritance promotes code reusability and helps in creating a hierarchical
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Q1. How dose your experience align with the role
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My experience in back end development, database management, and system integration aligns perfectly with the requirements of the role.
• I have worked as a back end developer for 5+ years, handling server-side logic, database design, and API integration.

• I am proficient in languages like Java, Python, and SQL, which are essential for back end development.

• I have successfully implemented scalable and efficient back end syste...read more
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Q2. How do you handle working in a team
Ans. 
I handle working in a team by communicating effectively, being open to feedback, collaborating on tasks, and supporting my team members.
• Communicate openly and effectively with team members

• Be open to feedback and constructive criticism

• Collaborate on tasks and share responsibilities

• Support and help team members when needed
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Q1. What is a 3 stage interview
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A 3 stage interview is a hiring process that consists of three separate rounds of interviews with different interviewers.
• First stage typically involves a screening interview with HR or a recruiter.

• Second stage may involve a technical interview with the hiring manager or team members.

• Final stage often includes a panel interview with senior management or key stakeholders.
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Q2. What is Hr round?
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Q1. What is the nearest ten of 4
Ans. 
The nearest ten of 4 is 10.
• The nearest ten of a number is the multiple of 10 that is closest to that number.

• In this case, the nearest ten of 4 is 10 because it is the multiple of 10 closest to 4.
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Q2. What is 4 tenth equal to?
Ans. 
4 tenths is equal to 0.4
• 4 tenths can be written as 0.4 in decimal form

• To convert tenths to decimals, divide the number by 10 (4 ÷ 10 = 0.4)
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Q1. What's the most effective way to gather user and system requirements?
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The most effective way to gather user and system requirements is through thorough communication and collaboration.
• Engage with stakeholders to understand their needs and expectations

• Use techniques such as interviews, surveys, and workshops to gather requirements

• Document requirements clearly and prioritize them based on importance

• Iterate and validate requirements with stakeholders to ensure accuracy
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Q2. How did you implement significant improvement to an IT infrastructure
Ans. 
Implemented automation tools to streamline processes, upgraded hardware and software, and optimized network performance.
• Introduced automation tools such as Ansible to automate repetitive tasks and improve efficiency

• Upgraded hardware components such as servers and storage devices to enhance performance

• Implemented software updates and patches to ensure system security and stability

• Optimized network configurations to impr...read more
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Whiteboard design challenges, Live coding tests, Technical assessment tasks, Numerical reasoning questions, and Proficiency quizzes.

Series of assessments that evaluate a candidate's technical skills, problem-solving abilities, and thought process

An assessment tool wherein questions are framed to evaluate a participant's knowledge of software programming languages

Academic skills will need to be efficient in order to work through the process in a shorter time.

The assignment method is used to determine what resources are assigned to which department, machine, or center of operation in the production process.

Practical assessments that evaluate a candidate's technical abilities and programming skills

A coding assessment is a test used to evaluate a programmer's skills in a specific way that's relevant to the job.

A coding round is a part of the interview process for software engineers that evaluates a candidate's programming skills, problem-solving abilities, and understanding of algorithms and data structures.

A coding round in an interview is a key part of the hiring process for software engineers, where candidates are evaluated on their programming skills

Coding tests are typically programming challenges that help technical recruiters test programming skills and competencies of a developer or programmer.

The first round was an interview conducted with a GENAI virtual bot.

Q1. Internal architecture of Spring boot, how enable autoconfiguration works
Ans. 
Spring Boot uses autoconfiguration to automatically configure the Spring application based on dependencies and properties.
• Spring Boot autoconfiguration is achieved through @EnableAutoConfiguration annotation

• Autoconfiguration classes are located in the org.springframework.boot.autoconfigure package

• Autoconfiguration classes are conditionally applied based on the presence of specific classes or properties
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Q2. Questions mostly on microservices and coding question on restTemplate
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Q1. Difference between hashmap and hash table
Ans. 
HashMap is non-synchronized and allows null values, while HashTable is synchronized and does not allow null values.
• HashMap is non-synchronized, meaning it is not thread-safe, while HashTable is synchronized and thread-safe.

• HashMap allows null values for both keys and values, while HashTable does not allow null keys or values.

• HashMap is generally preferred for non-thread-safe applications, while HashTable is used in mul
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Q2. Static block related questions
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Q3. Arraylist and linkedlist question
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