Category: Java Interview Question
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Table of Contents Prerequisites for Java 17 and Java 21 Deep Dive into Java 17 and Java 21 Concepts Step-by-Step Guide to Java 17 and Java 21 Development Full Example Project Using Java 17 and Java 21 Features Common Mistakes to Avoid in Java 17 and Java 21 Development Mistake 1: Incorrect Use of Records…
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Prerequisites for Java Multithreading and Concurrency To tackle Java multithreading and concurrency, you should have a solid grasp of **Java fundamentals**, including data types, operators, control structures, and object-oriented programming concepts. Familiarity with **threading basics**, such as the life cycle of a thread and the differences between **user threads** and **daemon threads**, is also essential.…
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When you have 200 concurrent users hitting a single-threaded service, you’ll see the connection pool exhaustion error: “java.sql.SQLException: Connection is closed”. This is because the default connection pool size is not sufficient to handle the load. To fix this, you need to implement proper testing using JUnit and Mockito. TL;DR: In this tutorial, you will…
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Prerequisites for Data Structures and Algorithms Interviews To excel in data structures and algorithms interviews, a strong foundation in Java fundamentals is essential. This includes a solid understanding of **object-oriented programming** concepts such as encapsulation, inheritance, and polymorphism. Additionally, familiarity with **Java collections framework** is crucial, as it provides a set of pre-built data structures…
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Table of Contents Prerequisites for Dynamic Programming in Java Deep Dive into Dynamic Programming Concepts Step-by-Step Approach to Solving Dynamic Programming Problems Full Example of a Dynamic Programming Problem in Java Common Mistakes to Avoid in Dynamic Programming Interviews Mistake 1: Not Initializing the Memoization Table Mistake 2: Not Handling Base Cases Correctly Production-Ready Tips…