Java Microservice Developer

Java Microservice Developer Interview Questions and Answers

Updated 13 Sep 2024
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Q1. Which DevOps tools have you used? How do you plan a pipeline?

Ans.

I have experience with Jenkins, Git, Docker, and Kubernetes for building and deploying microservices.

  • I have used Jenkins for continuous integration and continuous deployment

  • I have used Git for version control and managing code changes

  • I have used Docker for containerization and packaging of microservices

  • I have used Kubernetes for container orchestration and scaling

  • I plan a pipeline by defining stages for building, testing, and deploying microservices

  • I use tools like Jenkinsfil...read more

Q2. Explain about SpringBootApplication annotation

Ans.

SpringBootApplication annotation is used to mark the main class of a Spring Boot application.

  • Used to enable auto-configuration and component scanning

  • Combines @Configuration, @EnableAutoConfiguration, and @ComponentScan annotations

  • Main class annotated with @SpringBootApplication is the entry point of the application

Q3. Internal working of Java Hash Map

Ans.

Java HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.

  • HashMap uses an array of buckets to store key-value pairs.

  • The key is hashed to find the index of the bucket where the value is stored.

  • If multiple keys hash to the same index, a linked list or balanced tree is used to handle collisions.

  • HashMap allows one null key and multiple null values.

  • Example: HashMap map = new HashMap<>();

Q4. How many years have you used java?

Ans.

I have been using Java for 5 years in various projects and roles.

  • 5 years of experience with Java programming language

  • Worked on multiple projects involving Java development

  • Experience in developing microservices using Java

  • Familiar with Java frameworks like Spring Boot

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Q5. Second largest integer in an array Two - sum problem

Ans.

To find the second largest integer in an array and solve the two-sum problem.

  • Iterate through the array to find the largest and second largest integers.

  • Use a hashmap to store the difference between the target sum and each element in the array for the two-sum problem.

Q6. Design a voting system for a university

Ans.

Design a voting system for a university

  • Identify the type of voting system required (e.g. electronic, paper-based)

  • Determine the scope of the voting system (e.g. student council elections, faculty senate votes)

  • Establish eligibility criteria for voters and candidates

  • Create a secure and anonymous voting process

  • Implement a system for vote counting and result reporting

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Q7. Scope of Beans in java, design patterns- singleton

Ans.

Beans in Java are objects that are instantiated, assembled, and managed by a Spring IoC container. Singleton design pattern ensures only one instance of a class is created.

  • Beans in Java are managed by a Spring IoC container, allowing for easy instantiation and assembly of objects.

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

  • Scope of beans in Java can be defined as singleton, prototype, request,...read more

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