Java HashMap vs HashSet: Key-Value Pairs vs Unique Elements

🚀 Java Thread Lifecycle Explained Understanding how threads work is essential when building efficient and responsive Java applications. The Java Thread Lifecycle shows the different states a thread goes through during its execution. 🔹 New – A thread object is created but has not started yet. 🔹 Runnable – The thread is ready to run and waiting for CPU time. 🔹 Running – The thread is actively executing its task. 🔹 Blocked / Waiting – The thread is temporarily paused while waiting for resources or another thread. 🔹 Terminated – The thread has completed its execution. Knowing these states helps developers manage multithreading, synchronization, and performance optimization in Java applications. 💡 Multithreading is a powerful feature that allows programs to perform multiple tasks efficiently. #Java #Multithreading #JavaDeveloper #Programming

Cracking the Code: How to effectively debug and resolve complex Java Thread Deadlocks One of the most challenging aspects of high-scale systems is managing concurrency. I’ve put together a guide on how to identify, debug, and resolve Java thread deadlocks using thread dumps and automation. https://lnkd.in/gRZYVSzh #Java #Thread #MultiThreading #deadlock #concurrency

💡 How HashMap Works Internally in Java HashMap stores data in key–value pairs, but internally it uses a hashing mechanism. 🔹 Step 1: Hash Calculation When you insert a key, Java calculates a hash code using hashCode(). 🔹 Step 2: Bucket Index The hash value determines the bucket index in an internal array. 🔹 Step 3: Store Entry The key–value pair is stored in that bucket. 🔹 Step 4: Collision Handling If two keys map to the same bucket: • Java uses LinkedList (before Java 8) • Balanced Tree (Red-Black Tree) if the bucket becomes large (Java 8+) 📌 Flow: Key → hashCode() → Bucket Index → Store Entry Understanding this helps explain why HashMap operations are O(1) on average. #Java #JavaCollections #BackendDevelopment #SoftwareEngineering

Day 29 -What I Learned In Day (JAVA) Today I learned about Looping Statements in Java, especially the for loop and do-while loop . 🔹 What is a Do-While Loop? A do-while loop is an exit-controlled loop that executes the code at least once, even if the condition is false. Syntax: do { // statements } while(condition); 🔹 What is a For Loop? A for loop is an entry-controlled loop that checks the condition before execution. It is mainly used when the number of iterations is known. Syntax: for(initialization; condition; increment/decrement) { // statements } Practiced 👇 #Java #Programming #Loops #LearningJourney #100DaysOfCode #CodingPractice

🚀 Using Channels and Buffers in Java NIO This example demonstrates the basic usage of channels and buffers in Java NIO. A `FileChannel` is used to read data from a file into a `ByteBuffer`. The buffer is then flipped to prepare it for reading, and the data is printed to the console. NIO's channel and buffer API provides a more efficient way to handle I/O operations compared to traditional streams. #Java #JavaDev #OOP #Backend #professional #career #development

Day 25 -What I Learned In a Day(JAVA) Today I learned about conditional and control statements in Java, which allow programs to make decisions, repeat tasks, or alter the flow of execution. Three Types of Control Statements in Java: *Decision Statements (Decision Making) Used to execute code based on conditions. Examples: if / if-else / nested if-else – Executes code if condition is true or false. switch – Executes code based on the value of a variable. *Looping Statements: Used to repeat a block of code multiple times. Examples: for, while, do-while. *Jump Statements: Used to alter the normal flow of execution in loops or methods. Examples: break, continue, return. Today I Practiced 20 questions based on the decision making statement if,else. Practiced 👇 #Java #IfElse #ConditionalStatement #NestedIfElse #DecisionMaking #LogicalOperators #ComparisonOperators #JavaPractice #ProgrammingBasics #FlowControl #TodayILearned #CodingPractice

Day 8 of Java Fundamentals 🚀 Today I started learning the Java Collections Framework, which is widely used in real-world applications. 🔹 List → Ordered, allows duplicates 🔹 Set → No duplicates 🔹 Map → Stores key-value pairs Understanding collections is essential for handling data efficiently in Java applications. Excited to dive deeper into this topic 💻 #Java #LearningInPublic #JavaDeveloper #Collections

**State of the Java ecosystem: March 2026 update** I was looking through some of my old blog posts, and I came across my post about the state of the Java ecosystem which I wrote in December 2023. I figured that now was a good time for an update. https://lnkd.in/dkUuFjPC #incusdata #programmertraining #codingmatters #java

Abstraction means hiding implementation details and showing only essential features. It focuses on what to do, not how to do. Achieved using abstract classes and interfaces in Java. #Java #OOP #Abstraction

Day 9 – Java Streams Practice Series Today, I worked on finding the first repeated character in a string using Java Streams. Approach: Converted the string into a stream of characters Used Collectors.groupingBy() with LinkedHashMap to preserve insertion order Counted occurrences of each character Filtered characters with frequency greater than 1 Retrieved the first repeated character using findFirst() Key Learning: Using LinkedHashMap is important because it maintains the order of elements, which helps in identifying the first repeated character correctly. Why this matters: This problem helps strengthen concepts like stream transformations, grouping, counting, and order preservation in collections. Consistent practice is helping me build a deeper understanding of Java Streams and problem-solving. #Java #JavaStreams #CodingPractice #DataStructures #ProblemSolving #BackendDevelopment #100DaysOfCode