D&K Technologies Java Developer Interview Questions and Answers

Q1. Good queries like
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Q2. Sorting from two array,sum if the number equivalent to sequence of number.
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Basic array questions and few technical mcqs

Q1. In depth drill down of java and oops basics
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Q1. Transaction management questions
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Q2. Internal working of arraylist and hashmap
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ArrayList is a dynamic array implementation, while HashMap is a key-value pair data structure using hashing.
• ArrayList internally uses an array to store elements, and automatically resizes when needed.

• HashMap uses hashing to store key-value pairs, with keys being unique and values being accessible through the keys.

• ArrayList allows duplicate elements and maintains insertion order, while HashMap does not allow duplicate k...read more
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Q1. Why citi and what is your expected salary
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Citi offers a dynamic environment for growth, innovation, and collaboration, aligning with my career aspirations and values.
• Citi's commitment to innovation aligns with my passion for developing cutting-edge solutions, like using Java for fintech applications.

• The diverse and inclusive culture at Citi resonates with my belief in teamwork and collaboration, enhancing productivity and creativity.

• Citi's global presence prov...read more
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Q1. Write an API to fetch the id and JSON from the client.
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Q2. Find forth highest salary from List using java 8.
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Q1. Microservice Architecture questions
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Q2. Spring Boot Annotations
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Q1. Salary Expectation
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I expect a competitive salary that reflects my skills and experience, ideally in the range of $80,000 to $100,000 annually.
• Research industry standards: For example, Glassdoor or Payscale can provide insights into average salaries for Java Developers in my area.

• Consider my experience level: With 5 years of experience, I would expect a salary on the higher end of the spectrum.

• Factor in company size and location: Larger c...read more
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Q2. Basic HR questions
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Q1. Question were asked on basics of Java and SQL. Eg:- OOPS concepts, Collections
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Q1. Questions were asked specific topics on Java and SQL again. This time it was moderate. Eg:- Exception Handling, Springboot, Subquery, Joins etc
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Q1. This round was normal and HR was explaining the company policies and discussed the package.
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Q1. Stream APIs, Default method, Java 8 features
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Q1. Salary negotiation, why change in job
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Q1. Thread safety of a class
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Q1. 1) How do you achieve concurrency in your current job, and write code for it? 2) Write code for Rest API using Springboot, need to write Entity, Service, Repository, and Controller classes? 3)Volatile keyw...read more
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Answers to common Java Developer interview questions
• 1) Concurrency is achieved using multithreading in Java. Use threads, executors, or synchronized blocks. Example: using ExecutorService to run multiple tasks concurrently.

• 2) Rest API in Springboot: Entity class defines database table, Service class contains business logic, Repository class interacts with database, Controller class handles HTTP requests.

• 3) Volatile key...read more
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