What is Arraylist? What is inheritancce? Diff b/w Array and Arraylist? what is encapsulation?
Java Developer Interviews
Java Developer Interview Questions
In your interview for a java developer position, be prepared to answer technical questions that test your understanding of Java basics. Interviewers may also ask open-ended questions to assess your coding and problem-solving abilities. Prepare for non-technical questions that focus on time management, interpersonal communication, and work ethic.
Top Java Developer Interview Questions & How to Answer
Question 1
Question #1: What is the difference between HashTable and HashMap in Java?
How to answer
How to answer: Interviewers use technical questions to assess your formal training and understanding of the Java programming language. Use your answer to demonstrate your communication skills. Even if you have been coding for some time, it can be helpful to review Java basics before your interview.
Question 2
Question #2: Write a program to determine if 243 is an Armstrong number.
How to answer
How to answer: Interviewers use open-ended questions to test your coding skills. This question allows the employer to assess your ability to solve a problem using a Java algorithm. Explain your thinking process as you use a code editor or whiteboard to solve the problem.
Question 3
Question #3: How do you produce quality code when you have several Java projects to complete at once?
How to answer
How to answer: Java developers often juggle multiple projects at the same time. Interviewers use questions such as this to test your time management and organizational skills. Employers are also trying to assess your commitment to quality work. If you have experience as a developer, include examples from your work history that demonstrate high-quality work and effective time management.
30,867 java developer interview questions shared by candidates
Basics question on core java, oops and DBMS question were asked.
Interface, oops concept
Why would you use a Stored Procedure over a Table View?
Q. Garbage collectors - which one to use when. Q. Concurrency questions / program to write. Q. Java fundamentals - collection, abstract classes/interfaces, functional interfaces, unit testing in Java Q. Puzzles such as design a lift system Q. How to identify memory leaks, tune JVM for performance optimisation - provide examples how to achieve that.
The three fundamental pillars of OOP are: encapsulation, inheritance and polymorphism. Can you explain the shortly.
Write a quick sort algorithm
What makes you different from others for this role
Easy java questions, some database questions, work experience
Face to face interview - [Case study - group programming - coding/technical test ] Complete a partially completed REST API - the rest api consumes response from another rest api and produces a modified json response. Write appropriate logger statements, exception handling - adding the correct annotations(@controlleradvice and @exception handling) , calling the appropriate public methods and passing the right arguments in the public method of the custom exception class, Integrate with another REST API - using rest template to connect to another rest api and get the response and Object mapping (map the response object from other rest api to the response object of your api), Tools used - InteliJ, Swagger. you are allowed to google
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