Blog Archives
1 2 3 4 5 15

00: 18+ SQL best practices interview Q&As

It is a must to know the order in which the SQL clauses are executed. This is demonstrated with an example below in #5. Have this order of execution visibly pinned and understood. SQL is very easy to learn, but lots of hands-on experience is required to master:

1) to translate business requirements into SQL.
2) to write efficient & maintainable queries.… Read more ...

Tags:

00: 50+ SQL scenarios based interview Q&As on identifying & deleting duplicate records

50+ SQL interview questions and answers to solve real business scenarios. SQL is widely used in building microservices & Big Data projects. Learning SQL syntax is easy, but being able to convert a given business requirement into a query takes lots of practice. These scenarios based interview questions can assesses your experience.

Considerations & Tips

It is important to first understand the problem statement, and then ask the right questions to solve the problem.… Read more ...



00: Top 50+ Core Java interview questions & answers for 1 to 3 years experience

Top 50 core Java interview questions covering core Java concepts with diagrams, code, examples, and scenarios. If you don’t get these Java interview questions right, you will not be getting an offer.

== Vs equals(…)

Q1. What is the difference between “==” and “equals(…)” in comparing Java String objects?
A1. When you use “==” (i.e. shallow comparison), you are actually comparing the two object references to see if they point to the same object.… Read more ...

Tags:

00: Top 50+ Core Java interview questions answered – Q11 to Q23

The focus is on Java OOP interview questions and answers. Q11. What is the difference between constructors and other regular methods? A11. Constructors must have the same name as the class name and cannot return a value. The constructors are called only once per creation of an object while regular…

Read more ...
Tags: , , ,

00: Top 50+ Core Java interview questions answered – Q24 to Q36

Focus is on Java classes, interfaces and generics the interview questions and answers style. Java classes and interfaces are the building blocks. Q24. What happens when a parent and a child class have the same variable name? A24. When both a parent class and its subclass have a field with…

Read more ...
Tags: , , , ,

00: Top 50+ Core Java interview questions answered – Q37 to Q42

As a Java developer, you may not need to know how the JVM works, but the most important topic that you must know is Java Garbage Collection. How the Garbage Collection and object referencing work in Java. Q37. What do you know about the Java garbage collector? When does the…

Read more ...
Tags: , , , ,

00: Top 50+ Core Java Interview questions answered – Q43 to Q54

Q43. What can you tell about the performance of a HashMap compared to a TreeMap? Which one would you prefer? A43. A balanced tree does have O (log n) performance. The TreeMap class in Java maintains key/value objects in a sorted order by using a red-black tree. A red-black tree…

Read more ...
Tags: , , , ,

01: 12 Maven interview Questions & Answers

Q1. What is the difference between snapshot versions and release versions? A1. The term “SNAPSHOT” means the build is a snapshot of your code at a given time, which means downloading 1.0-SNAPSHOT today might give a different file than downloading it tomorrow or day after. When you are ready to…

Read more ...


01: 12 Web basics every Java web developer must know – Part 1

Q1. HTTP is a stateless protocol, so how do you maintain state? How do you store user data between requests? A1. This is a commonly asked interview question. The “http protocol is a stateless request/response based protocol”. You can retain the state information between different page requests as follows: HTTP…

Read more ...


01: 12+ Git Source control must know basics interview Q&As

Q1. How does Git differ from SVN (i.e Subversion)? A1. #1. Git is a distributed source control system meaning that there will be multiple client repositories. SVN is one repository with lots of clients. GIT is decentralized to a point where people can track their own edits locally without having…

Read more ...


1 2 3 4 5 15

Java Developer & Architect Interview Q&As

Java & Big Data Tutorials

Prepare to fast-track & go places

FAQs are marked with 🔥 as some questions are not only more popular with the interviewers, but also required to build robust systems. If you are an interviewer, cover well rounded topics to judge real experience.

Don't be overwhelmed by the number of questions as the technology stacks are so vast. The quality of the answers you provide to some of the key technical & open-ended questions along with your soft skills & attitude will go a long way in getting the job offers.

Note: Some Q&As belong to more than one category.
Top