All Articles

Data Structures June 29, 2026 • 5 min read

Under the Hood: Building a Custom HashMap in Java

Algorithms June 26, 2026 • 4 min read

Understanding Design URL Shortener in Java

Algorithms June 26, 2026 • 4 min read

Understanding Design Parking Lot in Java

Algorithms June 26, 2026 • 4 min read

Understanding Design Twitter in Java

Algorithms June 26, 2026 • 4 min read

Understanding Design Hit Counter in Java

Algorithms June 26, 2026 • 4 min read

Understanding LRU Cache in Java

Algorithms June 26, 2026 • 4 min read

Understanding Palindrome Partitioning in Java

Algorithms June 26, 2026 • 4 min read

Understanding N-Queens in Java

Algorithms June 26, 2026 • 4 min read

Understanding Word Search in Java

Algorithms June 26, 2026 • 4 min read

Understanding Permutations in Java

Algorithms June 26, 2026 • 4 min read

Understanding Subsets in Java

Algorithms June 26, 2026 • 4 min read

Understanding Assign Cookies in Java

Algorithms June 26, 2026 • 4 min read

Understanding Non-overlapping Intervals in Java

Algorithms June 26, 2026 • 4 min read

Understanding Merge Intervals in Java

Algorithms June 26, 2026 • 4 min read

Understanding Gas Station in Java

Algorithms June 26, 2026 • 4 min read

Understanding Jump Game in Java

Algorithms June 26, 2026 • 4 min read

Understanding Edit Distance in Java

Algorithms June 26, 2026 • 4 min read

Understanding Longest Increasing Subsequence in Java

Algorithms June 26, 2026 • 4 min read

Understanding House Robber in Java

Algorithms June 26, 2026 • 4 min read

Understanding Coin Change in Java

Algorithms June 26, 2026 • 4 min read

Understanding Climbing Stairs in Java

Algorithms June 26, 2026 • 4 min read

Understanding Sliding Window Maximum in Java

Algorithms June 26, 2026 • 4 min read

Understanding Implement Queue using Stacks in Java

Algorithms June 26, 2026 • 4 min read

Understanding Evaluate Reverse Polish Notation in Java

Algorithms June 26, 2026 • 4 min read

Understanding Min Stack in Java

Algorithms June 26, 2026 • 4 min read

Understanding Valid Parentheses in Java

Algorithms June 26, 2026 • 4 min read

Understanding Symmetric Tree in Java

Algorithms June 26, 2026 • 4 min read

Understanding Diameter of Binary Tree in Java

Algorithms June 26, 2026 • 4 min read

Understanding Lowest Common Ancestor (LCA) in Java

Algorithms June 26, 2026 • 4 min read

Understanding Level Order Traversal in Java

Algorithms June 26, 2026 • 4 min read

Understanding Invert Binary Tree in Java

Algorithms June 26, 2026 • 4 min read

Understanding Remove Nth Node From End in Java

Algorithms June 26, 2026 • 4 min read

Understanding Palindrome Linked List in Java

Algorithms June 26, 2026 • 4 min read

Understanding Merge Two Sorted Lists in Java

Algorithms June 26, 2026 • 4 min read

Understanding Detect Cycle in Linked List in Java

Algorithms June 26, 2026 • 4 min read

Understanding Reverse a Linked List in Java

Algorithms June 26, 2026 • 4 min read

Understanding Roman to Integer in Java

Algorithms June 26, 2026 • 4 min read

Understanding Longest Common Prefix in Java

Algorithms June 26, 2026 • 4 min read

Understanding Group Anagrams in Java

Algorithms June 26, 2026 • 4 min read

Understanding Longest Palindromic Substring in Java

Algorithms June 26, 2026 • 4 min read

Understanding Valid Anagram in Java

Algorithms June 26, 2026 • 4 min read

Understanding Trapping Rain Water in Java

Algorithms June 26, 2026 • 4 min read

Understanding Rotate Array in Java

Algorithms June 26, 2026 • 4 min read

Understanding Move Zeroes in Java

Algorithms June 26, 2026 • 4 min read

Understanding Maximum Subarray (Kadane's Algorithm) in Java

Algorithms June 26, 2026 • 4 min read

Understanding Two Sum in Java

Java Concurrency June 25, 2026 • 5 min read

ExecutorService vs. CompletableFuture in Java: A Layman's Guide

Java Concurrency June 25, 2026 • 5 min read

Choosing the Right Java Lock: Synchronized, ReentrantLock, ReadWriteLock, and StampedLock

Java Core & OOP June 25, 2026 • 4 min read

Understanding Duplicate Strings in Java Heap: Immutability vs. Uniqueness

Java Concurrency June 25, 2026 • 5 min read

Understanding JVM Heap Dumps: A Layman's Guide to HPROF Files

Java Concurrency June 23, 2026 • 6 min read

JVM is Hung in Production: Step-by-Step Troubleshooting Guide

Java Core & OOP June 23, 2026 • 5 min read

Unit and Integration Testing in Spring Boot: A Simple Guide

Java Core & OOP June 23, 2026 • 5 min read

Java Memory Management and Garbage Collection: A Simple Guide

Java June 22, 2026 • 4 min read

Sorting Maps by Value in Java Streams: A Simple Guide

Java June 22, 2026 • 4 min read

Understanding Polymorphism and Method Overriding: A Simple Guide

Java June 19, 2026 • 4 min read

Building a Web Link Spam Analyzer in Java: A Simple Guide

Java Collections June 20, 2026 • 4 min read

Shuffling Lists in Java using Collections.shuffle()

Java Core & OOP June 20, 2026 • 4 min read

Understanding Blank Final Variables in Java

Java Core & OOP June 20, 2026 • 4 min read

Serialization and Class Inheritance in Java

Java Core & OOP June 20, 2026 • 5 min read

Understanding Java Serialization & the Transient Keyword

Java Enums June 20, 2026 • 4 min read

Advanced Java Enums: Constant-Specific Class Bodies & Overrides

Java Concurrency June 20, 2026 • 4 min read

How to Create Threads in Java: Extending Thread vs. Implementing Runnable

Java Concurrency June 20, 2026 • 4 min read

Understanding Java Semaphores: Rate Limiting & Concurrency Control

Java Concurrency June 20, 2026 • 4 min read

Alternating Odd & Even Numbers using ExecutorService in Java

Algorithms June 20, 2026 • 4 min read

Constructing the Minimum Possible Number using Counting Sort

Java Core & OOP June 20, 2026 • 5 min read

Understanding JDBC Database Connectivity in Java

Java Collections June 20, 2026 • 4 min read

Implementing Custom Iterator and Iterable in Java

Java Core & OOP June 20, 2026 • 4 min read

BigDecimal vs. Double for Financial Calculations in Java

Algorithms June 20, 2026 • 4 min read

Finding the Most Frequent IP Address in Log Files

Algorithms June 20, 2026 • 4 min read

Tape Equilibrium Split Sum Minimization in Java

Algorithms June 20, 2026 • 4 min read

Finding the Longest Binary Gap in Java

Kafka & Distributed Systems June 20, 2026 • 5 min read

How to Ensure Zero Data Loss in Apache Kafka

Kafka & Distributed Systems June 20, 2026 • 4 min read

Handling Message Ordering in Kafka Across Partitions

Kafka & Distributed Systems June 20, 2026 • 5 min read

Designing a Kafka-Based Order Processing System

Kafka & Distributed Systems June 20, 2026 • 4 min read

How to Implement a Dead Letter Queue (DLQ) in Kafka

Kafka & Distributed Systems June 20, 2026 • 4 min read

Common Apache Kafka Pitfalls and How to Avoid Them

Kafka & Distributed Systems June 20, 2026 • 5 min read

Common Kafka Architecture and Design Patterns

Kafka & Distributed Systems June 20, 2026 • 4 min read

Important Kafka Metrics to Monitor in Production

Kafka & Distributed Systems June 20, 2026 • 4 min read

Introduction to Apache Kafka Security: Authentication & Authorization

Kafka & Distributed Systems June 20, 2026 • 4 min read

Handling Schema Evolution in Kafka with Schema Registry

Kafka & Distributed Systems June 20, 2026 • 4 min read

Kafka Delivery Semantics: At-Most-Once, At-Least-Once, Exactly-Once

Kafka & Distributed Systems June 20, 2026 • 4 min read

Why Kafka is Moving to KRaft (Raft Metadata Mode) from ZooKeeper

Kafka & Distributed Systems June 20, 2026 • 4 min read

Understanding Log Compaction in Apache Kafka

Kafka & Distributed Systems June 20, 2026 • 4 min read

What is Kafka Connect? Source vs. Sink Connectors

Kafka & Distributed Systems June 20, 2026 • 4 min read

What is a State Store in Kafka Streams?

Kafka & Distributed Systems June 20, 2026 • 4 min read

Kafka Streams: KStream vs. KTable Explained Simply

Kafka & Distributed Systems June 20, 2026 • 5 min read

Kafka Streams vs. Kafka Consumer: Which Should You Use?

Kafka & Distributed Systems June 20, 2026 • 4 min read

How Kafka Achieves High Throughput (Zero-Copy & Sequential I/O)

Kafka & Distributed Systems June 20, 2026 • 4 min read

Key Consumer Configurations for High Throughput in Kafka

Kafka & Distributed Systems June 20, 2026 • 4 min read

Key Producer Configurations for High Throughput in Kafka

Kafka & Distributed Systems June 20, 2026 • 4 min read

What Happens When a Kafka Broker Goes Down?

Kafka & Distributed Systems June 20, 2026 • 4 min read

Why min.insync.replicas is Crucial for Kafka Durability

Kafka & Distributed Systems June 20, 2026 • 4 min read

How Apache Kafka Replication and Leader Election Work

Kafka & Distributed Systems June 20, 2026 • 4 min read

Kafka Consumer Commits: commitSync vs. commitAsync

Kafka & Distributed Systems June 20, 2026 • 3 min read

Kafka auto.offset.reset: Earliest vs. Latest Explained Simply

Kafka & Distributed Systems June 20, 2026 • 4 min read

Understanding Kafka Consumer Rebalancing and How to Minimize It

Kafka & Distributed Systems June 20, 2026 • 4 min read

What is Apache Kafka and Why is it Used?

Kafka & Distributed Systems June 20, 2026 • 4 min read

The Core Components of Apache Kafka Explained

Kafka & Distributed Systems June 20, 2026 • 4 min read

Apache Kafka vs. RabbitMQ: Understanding the Differences

Kafka & Distributed Systems June 20, 2026 • 4 min read

Understanding Kafka Topics and Partitioning Mechanics

Kafka & Distributed Systems June 20, 2026 • 4 min read

What is an Offset in Kafka and How is it Managed?

Kafka & Distributed Systems June 20, 2026 • 4 min read

How to Choose the Right Number of Partitions in Kafka

Kafka & Distributed Systems June 20, 2026 • 5 min read

Inside the Kafka Producer: Architecture and Internal Flow

Kafka & Distributed Systems June 20, 2026 • 4 min read

Understanding Kafka Producer ACKs Settings and Trade-offs

Kafka & Distributed Systems June 20, 2026 • 4 min read

What is an Idempotent Producer in Kafka?

Kafka & Distributed Systems June 20, 2026 • 4 min read

How Kafka Consumers and Consumer Groups Work

Java Core & OOP June 19, 2026 • 4 min read

Understanding Java Inner Classes: Member, Local, and Anonymous

Java Core & OOP June 19, 2026 • 4 min read

Understanding Java Static Nested Classes and Nested Interfaces

Java Core & OOP June 19, 2026 • 3 min read

Class Initialization Sequences in Java Inheritance

Java Collections June 19, 2026 • 5 min read

Mutating Map Keys and the HashSet Removal Gotcha

Java Collections June 19, 2026 • 4 min read

How Map Sorting Works with and without Java Streams

Java Collections June 19, 2026 • 4 min read

Sorted Sets (TreeSet) and Custom Comparator Gotchas in Java

Algorithms June 19, 2026 • 3 min read

LeetCode: Reversing a 32-bit Integer and Preventing Overflow

Algorithms June 19, 2026 • 4 min read

Sorting Lists Based on Element Occurrences in Java

Algorithms June 19, 2026 • 4 min read

Solving HackerRank's Min-Max Sum Challenge in Java

Algorithms June 19, 2026 • 3 min read

Solving HackerRank's Plus-Minus Ratio Challenge in Java

Algorithms June 19, 2026 • 3 min read

Finding Target Sum Pairs Using Complements HashSet in Java

Java Exceptions June 19, 2026 • 4 min read

Understanding Java Exception Propagation

Java Exceptions June 19, 2026 • 4 min read

How to Use throw, throws, and Custom Exceptions in Java

Java Exceptions June 19, 2026 • 4 min read

Java Multiple Catch Blocks and the Finally Execution Trap

Java Exceptions June 19, 2026 • 4 min read

Java Exception Rules in Method Overriding

Java IO & NIO June 19, 2026 • 4 min read

Reading and Writing Files in Java: The Classic IO Way

Java IO & NIO June 19, 2026 • 4 min read

Building a Custom Filter Reader: The Decorator Pattern in Java IO

Java IO & NIO June 19, 2026 • 3 min read

Modern File Manipulation in Java: Introduction to NIO.2

Java Streams & Functional June 19, 2026 • 5 min read

Java 8 Streams Recipes for Common Programming Tasks

Java Streams & Functional June 19, 2026 • 4 min read

Deep Dive into Java 8 Method References

Java Generics June 19, 2026 • 4 min read

Understanding Generic Classes and Methods in Java

Java Generics June 19, 2026 • 5 min read

Demystifying Java Generics Wildcards and Bounded Types

Java Annotations June 19, 2026 • 4 min read

Understanding Built-In Annotations in Java

Java Annotations June 19, 2026 • 4 min read

How to Create and Read Custom Annotations in Java

Java Enums June 19, 2026 • 3 min read

Understanding the Basics of Java Enums

Java Enums June 19, 2026 • 4 min read

Mastering Advanced Java Enums: Fields and Constructors

Java Core & OOP June 19, 2026 • 3 min read

Understanding String Equality in Java

Java Core & OOP June 19, 2026 • 5 min read

Demystifying the equals() and hashCode() Contract in Java

Java Core & OOP June 19, 2026 • 4 min read

Understanding Java Class Initialization Order and Blocks

Algorithms June 19, 2026 • 3 min read

Finding the Longest Consecutive Increasing Chain in Java

Algorithms June 19, 2026 • 3 min read

Summing Up to a Target Sum in Java

Java Core & OOP June 19, 2026 • 4 min read

How ArrayList Works Under the Hood

Algorithms June 19, 2026 • 3 min read

Rotating Arrays in Java

Algorithms June 19, 2026 • 4 min read

Finding the Top K Elements

Algorithms June 19, 2026 • 4 min read

Maximizing Stock Profits

Algorithms June 19, 2026 • 3 min read

Detecting Loops in a Linked List

Algorithms June 19, 2026 • 4 min read

Reversing a Linked List

Algorithms June 19, 2026 • 4 min read

Understanding Balanced Parentheses

Java Streams & Functional June 19, 2026 • 4 min read

Flatmapping Min/Max & Diamond Inheritance

Java Streams & Functional June 19, 2026 • 4 min read

Flattening 2D Arrays in Java

Java Streams & Functional June 19, 2026 • 4 min read

Sorting by Multiple Fields

Algorithms June 19, 2026 • 4 min read

Understanding Anagram Grouping

Java Core & OOP June 19, 2026 • 4 min read

Understanding Strings as HashMap Keys

Java Core & OOP June 19, 2026 • 4 min read

Demystifying Java's equals() and hashCode() Contract

Java Concurrency June 19, 2026 • 4 min read

Demystifying Java's Synchronized Keyword

Java Concurrency June 19, 2026 • 4 min read

Printing Odd & Even Numbers using Two Threads

Java Concurrency June 19, 2026 • 4 min read

Understanding Java's Synchronized Deadlocks

Java Concurrency June 19, 2026 • 4 min read

Understanding Java Deadlocks

Design Patterns June 19, 2026 • 4 min read

Demystifying Java's Builder Design Pattern

Algorithms June 19, 2026 • 4 min read

Demystifying String Permutations

Algorithms June 19, 2026 • 4 min read

Reversing Strings While Preserving Space Positions

Java Concurrency June 19, 2026 • 5 min read

Understanding Java's Wait and Notify

Java Concurrency June 19, 2026 • 4 min read

Understanding Java's Producer-Consumer Pattern

Java Concurrency June 19, 2026 • 5 min read

Demystifying Java's Thread Pool

Algorithms June 19, 2026 • 5 min read

Demystifying the Bridge and Torch Problem

Java Concurrency June 18, 2026 • 4 min read

Understanding Java's CompletableFuture

Java Parallelism June 18, 2026 • 4 min read

Demystifying Java's ForkJoinPool