Java & System Design Interview Hub

Mastering Latest Java Multithreading Interview Questions 2026

Virtual threads, ExecutorService, CompletableFuture, happens-before, deadlock detection.

Mastering Data Structures and Algorithms Interview Questions in Java 2026

Arrays, LinkedLists, Trees, Graphs, Heaps — interview patterns with Java solutions.

Dynamic Programming Interview Questions Java with Solutions

Memoisation vs tabulation, classic DP problems (knapsack, LCS, coin change) with step-by-step solutions.

Java OOP Concepts Interview Questions with Real World Scenarios

Inheritance, polymorphism, abstraction, encapsulation — tricky scenarios and anti-patterns.

Dynamic Programming Interview Questions Java with Solutions and Examples

Mastering Java Exception Handling: Expert Answers to Tricky Interview Questions

Checked vs unchecked, custom exceptions, exception chaining, try-with-resources — tricky edge cases.

Mastering Java Multithreading and Concurrency Interview Questions with Answers

synchronized, volatile, ReentrantLock, deadlock, race conditions, thread-safe collections.

Sorting and Searching Interview Questions Java with Complexity Analysis

Mastering Java Memory Management and Garbage Collection Interview Questions

Heap vs stack, GC algorithms (G1, ZGC, Shenandoah), memory leaks, weak/soft/phantom references.

Ace Your Next Interview with the Latest Java Multithreading Interview Questions 2026

Mastering Graph and Tree Interview Questions in Java with Step by Step Solutions

Data Structures and Algorithms Interview Questions Java 2026

Spring Boot Testing Interview Questions — JUnit & Mockito 2026

@MockBean, @WebMvcTest, @SpringBootTest, TestContainers, ArgumentCaptor — interview-ready answers.

Mastering Spring Boot Security and JWT: Top Interview Questions 2026

SecurityFilterChain, JWT validation flow, OAuth2, @PreAuthorize, stateless sessions.

Mastering Spring Batch Chunk Processing and Partitioning

@PropertySource vs @PropertySources — Annotations Overview

Microservices Design Patterns Explained with Spring Boot

API Gateway, Circuit Breaker, Service Discovery, Saga, CQRS, Outbox — interview-level depth.

Building Scalable Systems with Event-Driven Architecture using Spring Boot and Kafka

Producer/consumer guarantees, consumer groups, partitioning strategy, at-least-once delivery.

System Design: Scalable Notification System

Fan-out strategy, priority queues, deduplication, delivery guarantees, and capacity estimation.

Microservices Design Patterns with Spring Boot: Complete Guide

Cracking Design Patterns Interview Questions in Java with Real-World Examples

Factory, Builder, Strategy, Observer, Proxy, Decorator, Singleton — when to use which.

Dependency Inversion Principle (DIP)

Interface Segregation Principle (ISP)

Liskov Substitution Principle (LSP)

Open/Closed Principle (OCP)

Single Responsibility Principle (SRP)

What is the SOLID Design Principle in Java?

Java Exception Handling — Complete Guide

Difference between YYYY vs yyyy — Java Date Formatter

Autoboxing and Unboxing in Java

How To Find the Duplicate Number In Java

Java Streams API — Complete Guide

IS-A Relationship in Java