03: 9 Core Java Concepts you can’t afford to not know

Q1. How will you go about explaining the following Java concepts to a beginner who is starting to learn Java? 1. Process Vs Threads 2. Heap versus Stack 3. Local variables versus instance variables 4. How do threads communicate with…

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Arulkumaran Kumaraswamipillai

In 1999, I pivoted from mechanical engineering to become a self-taught Java expert. Over the past 19+ years, I have built a high-demand contracting career, delivering mission-critical solutions for 13+ top-tier organisations. With a proven track record that has generated over 130+ job offers, I help enterprises solve complex data challenges at scale.

Author of the book "Java/J2EE job interview companion", which sold 35,000+ copies on amazon.com & superseded by this site with 2000+ registered users.

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Email: java-interview@hotmail.com

Latest posts by Arulkumaran Kumaraswamipillai (see all)

How would you go about.. building an ETL pipeline to handle 3k TPS (i.e transactions per second) - April 17, 2026
00b: Python variable scopes, assigning types optionally and execution order interview Q&As - April 11, 2026
How to prepare for the Java job interviews? - January 3, 2026

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