Java Hierarchical Inheritance Explained

Just published my first Medium article on Java Collections. I created this as a quick reference while revising Java Collections, and thought it might be useful for others as well. The article covers: • Overview of the Java Collections Framework • Difference between DSA and Collections • Core collection interfaces with examples • Common implementations like List, Set, Map, and Queue • Utility concepts such as Comparator and Comparable • Introduction to concurrent collections like ConcurrentHashMap and BlockingQueue If you're preparing for interviews or revising Java concepts, this might be helpful. 👇 Read it here: https://lnkd.in/gjczYspb #Java #JavaDeveloper #Collections #Programming #100DaysOfCode #Tech #Learning #Medium

🧵 Multithreading Today I explored some important concepts of Multithreading in Java. Multithreading allows a program to execute multiple tasks simultaneously, improving performance and efficient CPU utilization. 🔹 Two Ways to Achieve Multitasking • Process-based multitasking – Multiple programs run simultaneously. • Thread-based multitasking – Multiple threads run inside a single program. 🔹 Two Ways to Create Threads 1️⃣ Extending Thread Class – Create a class that extends Thread and override the run() method. 2️⃣ Implementing Runnable Interface – Create a class that implements Runnable and pass it to a Thread object. 🔹 Important Thread Control Methods • Thread.sleep(milliseconds) – Pauses the current thread for a specific time. • Object.wait() – Makes the thread wait until another thread notifies it. • Thread.join() – Makes a thread wait until another thread finishes execution. • Thread.yield() – Temporarily pauses the current thread to allow other threads of the same priority to execute. • Thread.suspend() – Temporarily stops a thread (⚠ Deprecated in Java). 🔹 Synchronization Synchronization is used to control the access of multiple threads to shared resources and prevent data inconsistency. 💡 Understanding multithreading concepts helps build efficient and high-performance Java applications. #Java #Multithreading #JavaProgramming #LearningJava #CodingJourney #SoftwareDevelopment

Day 24 Deep Dive into Java: Exception Handling, Interfaces & Abstraction Today, I explored Java more deeply, focusing on: ✔ Exception Handling ✔ Exception Hierarchy ✔ Interfaces ✔ Abstract Classes Understanding how Java structures its error-handling mechanism through the Throwable hierarchy gave me clarity on how exceptions are classified into: Checked Exceptions (compile-time) Unchecked Exceptions (RuntimeException) Errors (serious system-level issues) I also strengthened my understanding of abstraction by revisiting the difference between Interfaces and Abstract Classes: 🔹 Interfaces define behavior and support multiple inheritance. 🔹 Abstract classes allow partial implementation and can include constructors and instance variables. This learning helped me better understand how Java enforces design principles like abstraction, modularity, and clean architecture. The more I explore core Java concepts, the more I appreciate how thoughtfully the language is structured. Consistent learning. Strong foundations. Continuous improvement. 💻✨ #Java #CoreJava #ExceptionHandling #OOP #Abstraction #Programming #SoftwareDevelopment

I worked on a Java program to understand how constructors initialize objects in Object-Oriented Programming. 💻☕ In this project, I created a class Pen with different constructors to explore how object creation works with various inputs: • Used a no-argument constructor for default object creation 🧩 • Implemented parameterized constructors to pass values during object creation 📥 • Observed how constructor arguments influence object initialization 🔍 • Printed object references to understand default Java object representation 🖨️ This helped me build clarity on: • Object instantiation in Java ⚙️ • Role of constructors in initialization 🏗️ • Difference between object reference and actual data 🧠 A focused exercise to strengthen core Java fundamentals. 🚀 #Java #OOP #Constructors #JavaProgramming #CodingJourney #LearningJava #Developers

🚀 Understanding the if Statement (Java) The 'if' statement in Java allows conditional execution of code blocks. It evaluates a boolean expression; if the expression is true, the code block within the 'if' statement is executed. If the expression is false, the code block is skipped. This is a fundamental control flow statement for creating branching logic. 'if' statements can be nested to create more complex conditions. #Java #JavaDev #OOP #Backend #professional #career #development

Understanding the main() Method in Java Every Java program begins execution from a single entry point — the main() method. Understanding its structure is fundamental for anyone starting with Java. public static void main(String[] args) Let’s break it down clearly: public → Access specifier. The JVM must access this method from anywhere. static → Allows the method to be called without creating an object of the class. void → Specifies that the method does not return any value. main → The method name recognized by the JVM as the starting point. String[] args → Command-line arguments passed during program execution. Function Body { } → The block where execution actually begins. If the signature is modified incorrectly, the JVM will not recognize it as the entry point. Understanding this is not just about syntax — it’s about understanding how the JVM interacts with your program. Grateful to my mentor Anand Kumar Buddarapu for emphasizing the importance of fundamentals and ensuring I build a strong base before moving to advanced concepts. Your guidance truly makes a difference. #Java #Programming #CoreJava #LearningJourney #SoftwareDevelopment

What is Garbage Collection in Java 🤔 Many developers use Java daily, but memory management often stays a mystery Here’s the simple truth Garbage Collection (GC) → JVM automatically removes objects that are no longer referenced Why it matters → Prevents memory leaks, keeps apps stable, avoids OutOfMemoryError String name = new String("Java"); name = null; // old object now eligible for GC Key Points ======= Object with no references → eligible for GC Eligible ≠ immediately deleted → JVM decides timing Most objects in Java apps are cleaned automatically → you focus on building features Rule of Thumb Stateless objects → no GC worries Heavy object creation → can trigger frequent GC, impacts performance Understanding GC = writing efficient, scalable Java code #Java #InterviewSeries #LearnJava #BackendDevelopment #JavaDeveloper #CodingTips #Programming #JavaInterviewPrep #TechLearning #DeveloperTips

What is Garbage Collection in Java 🤔 Many developers use Java daily, but memory management often stays a mystery Here’s the simple truth Garbage Collection (GC) → JVM automatically removes objects that are no longer referenced Why it matters → Prevents memory leaks, keeps apps stable, avoids OutOfMemoryError String name = new String("Java"); name = null; // old object now eligible for GC Key Points ======= Object with no references → eligible for GC Eligible ≠ immediately deleted → JVM decides timing Most objects in Java apps are cleaned automatically → you focus on building features Rule of Thumb Stateless objects → no GC worries Heavy object creation → can trigger frequent GC, impacts performance Understanding GC = writing efficient, scalable Java code #Java #InterviewSeries #LearnJava #BackendDevelopment #JavaDeveloper #CodingTips #Programming #JavaInterviewPrep #TechLearning #DeveloperTips

🚀 Java practice - Day 89 Completed! 👍 Problem: Find Minimum Operations to Make All Elements Divisible by Three Language: Java Today’s problem was about minimizing operations. We’re given an array, and in one operation we can add or subtract 1 from any element. The goal is to make all elements divisible by 3 using the minimum number of operations. ✨ #Day89 #Java #LeetCode #Arrays #ProblemSolving #DailyCoding #Consistency #100DaysOfCode