Java Microservice Developer
Java Microservice Developer Interview Questions and Answers
Q1. Which DevOps tools have you used? How do you plan a pipeline?
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
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
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?
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
Q5. Second largest integer in an array Two - sum problem
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
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
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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