Category: interview

Top 10 Java, Microservices & Kubernetes Interview Questions Every Senior Tech Lead Should Know

Most interview questions test your memory. Great interview questions test your engineering judgment. Over the years, I've interviewed hundreds of Java developers ranging from fresh graduates to Solution Architects. One thing has become increasingly clear: senior roles are no longer about syntax. They're about understanding how Java applications behave in production, how microservices communicate, and how applications survive in Kubernetes.…

SET 15 – Default Methods, Static Methods and Functional Interfaces

Java 8 introduced one of the most important changes to interfaces: Default methods Static methods inside interfaces Multiple inheritance conflict resolution Functional interfaces Method references Date-Time API Lambda exception handling Q1. What is the output? interface Vehicle {     default void start() {         System.out.print("Vehicle ");     } } class Car implements Vehicle { }…

SOLID Principles in Java: Building Maintainable and Scalable Applications

Introduction As software systems grow, code often becomes difficult to maintain, extend, and test. New features introduce unexpected bugs, small changes require modifications in multiple places, and development velocity gradually decreases. To address these challenges, Robert C. Martin (Uncle Bob) introduced the SOLID Principles, a set of five object-oriented design principles that help developers create software that is: Easy to…

JVM, Memory Management & Exception Handling

MCQs Q1. Which JVM memory area stores objects? A. Stack B. Heap C. Method Area D. Program Counter Q2. What is Garbage Collection? A. Memory Allocation B. Memory Cleanup of Unused Objects C. Object Creation D. Stack Cleanup Q3. Which exception is unchecked? A. SQLException B. IOException C. ClassNotFoundException D. NullPointerException Q4. Which keyword is used to explicitly throw an…

Understanding Time Complexity and Space Complexity in Java – An Interview Guide

When preparing for software engineering interviews, one topic that appears consistently across coding rounds and system design discussions is Time Complexity and Space Complexity. Many developers can write code that works, but interviewers are often interested in understanding whether the solution is efficient and scalable. This is where complexity analysis becomes important. In this article, we'll explore what time and…

Java Interview Question: Reverse Pyramid Pattern with Time Complexity Analysis

Pattern-based coding questions are a common way to assess a candidate's logical thinking, loop understanding, and ability to derive mathematical relationships from a problem statement. One such question is the Reverse Pyramid Pattern. Problem Statement Write a Java program that takes an integer N as input and prints a reverse pyramid. Example Input 5 Expected Output * * * *…