Java PriorityQueue Explained: Priority-Based Processing

Day 55 of Sharing What I’ve Learned 🚀 LinkedHashSet in Java — Order + Uniqueness Combined After learning how HashSet ensures uniqueness, I explored something even more practical — LinkedHashSet. 👉 It gives the best of both worlds: unique elements + predictable order 🔹 What is LinkedHashSet? LinkedHashSet is an implementation of the Set interface that maintains insertion order while storing unique elements. 👉 It is built on top of HashSet with a linked list to preserve order. 🔹 Why use LinkedHashSet? ✔ Maintains Order Elements are stored in the order they were inserted. ✔ No Duplicates Just like HashSet, duplicates are not allowed. ✔ Predictable Iteration Traversal happens in insertion order. 🔹 Key Features ✔ Stores unique elements ✔ Maintains insertion order ✔ Allows one null value ✔ Slightly slower than HashSet (due to ordering) 🔹 Important Methods ✔ add() ✔ remove() ✔ contains() ✔ size() ✔ isEmpty() 🔹 When should we use LinkedHashSet? 👉 Use LinkedHashSet when: ✔ You want unique elements ✔ You also need insertion order ✔ You want predictable iteration 🔹 When NOT to use? ❌ When order doesn’t matter → use HashSet ❌ When you need sorted order → use TreeSet 🔹 Key Insight 💡 LinkedHashSet is like HashSet with memory — 👉 it remembers the order in which elements were added. 🔹 Day 55 Realization 🎯 Sometimes small improvements (like maintaining order) 👉 can make a data structure much more useful in real-world applications. #Java #LinkedHashSet #DataStructures #CollectionsFramework #Programming #DeveloperJourney #100DaysOfCode #Day55 Grateful for guidance from, Sharath R TAP Academy

🚀 Day 49 of My Learning Journey Today, I explored an important concept in Java — Creating Custom Immutable Classes 🔐 💡 An immutable object is one whose state cannot be changed after it is created. This concept is widely used in Java (like in String) and plays a key role in writing secure and thread-safe applications. 🔍 What I Learned: ✔ How to design my own immutable class ✔ Why immutability improves security and performance ✔ The importance of controlling object modification 🛠 Key Rules to Create Immutable Class: 🔹 Declare the class as final 🔹 Make all variables private and final 🔹 Initialize values through constructor 🔹 Do not provide setter methods 🔹 Return copies of mutable objects (defensive copying) 💻 Simple Example: final class Student { private final int id; private final String name; public Student(int id, String name) { this.id = id; this.name = name; } public int getId() { return id; } public String getName() { return name; } } 📌 Key Takeaway: Immutability helps in building safe, reliable, and predictable applications — especially in multi-threaded environments. 📈 Learning something new every day and getting one step closer to becoming a better developer! #Java #LearningJourney #Immutability #OOP #Programming #DeveloperGrowth

🚀 Day 47 of My Learning Journey – Java Wrapper Classes Today, I explored Wrapper Classes in Java, an important concept that bridges primitive data types and objects. 🔍 What I Learned: ✔️ Wrapper classes convert primitive data types into objects ✔️ Each primitive type has a corresponding wrapper class (e.g., int → Integer, char → Character, double → Double) ✔️ Enables use of primitives in collections like ArrayList 💡 Key Concepts: 🔹 Autoboxing – Automatic conversion of primitive to object 🔹 Unboxing – Converting object back to primitive 🔹 Useful methods like parseInt(), toString(), and valueOf() 📊 Why It Matters: Wrapper classes make Java more flexible by allowing primitives to be treated as objects, especially when working with frameworks and collections. 📌 Example Use Case: Storing integers in an ArrayList using Integer instead of int. 🎯 Takeaway: Understanding wrapper classes is essential for writing efficient and modern Java programs. #Java #LearningJourney #Programming #Day47 #TechSkills #Developers #Coding

🚀 Day 44 of My Learning Journey Today I explored some important concepts in Java related to memory management and threading. Here’s what I learned: 🔹 Finalize Method Used before an object is garbage collected. Helps in performing cleanup activities like closing resources. However, it's not reliable and is now considered outdated in modern Java practices. 🔹 Mark and Sweep Algorithm A key technique used in Garbage Collection. Mark Phase: Identifies objects that are still in use. Sweep Phase: Removes unused objects from memory. Improves memory efficiency and prevents memory leaks. 🔹 Garbage Collector Automatically manages memory by removing unused objects. Helps developers focus more on logic rather than memory handling. Works in the background for better performance. 🔹 Daemon Thread A low-priority thread that runs in the background. Supports main threads (e.g., garbage collection). Automatically stops when all user threads finish execution. 💡 Key Takeaway: Understanding how memory is managed and how background threads work is crucial for writing efficient and optimized Java programs. #Java #GarbageCollection #Multithreading #LearningJourney #Programming #Developer

Day 39 of learning java Today I learned something very important in Java, Object Creation. Syntax: "className objectName = new constructor();" Here’s what I understood: • The left side ("className objectName") is just declaring a reference variable. • The right side ("new constructor()") is where the actual object is created. • Memory is allocated only when we use the "new" keyword. • The constructor gets executed automatically when the object is created. • Without "new", no memory is allocated and no constructor runs. In short: Declaration != Object creation You need "new" to actually create and use the object. This concept made things much clear about how Java handles memory and execution internally. Thanks to my mentor Ashim Prem Mahto for the clear explanations and for always clearing my doubts. #Java #LearningJourney #Programming #JavaBasics #CodingLife #DeveloperJourney #TechLearning #Beginners #CodeNewbie #jvm #SoftwareEngineer #StudentLife

🚀 Day 36 of My Java Learning Journey Today I explored the "throws" keyword in Exception Handling 💻 🔹 What I learned: 👉 "throws" is used in method declaration 👉 It indicates that a method may throw an exception 👉 It passes the responsibility of handling exception to the caller 👉 Helps in writing cleaner and modular code 🔹 Key Insight: ⚡ "throws" does NOT handle the exception ⚡ It only declares it — handling is done using "try-catch" 🔹 Example Thought: If a method can cause an error, instead of handling it there, we can delegate it to another method using "throws" 💡 Learning this made me understand how Java manages errors efficiently and keeps code structured 📌 Step by step, improving my programming fundamentals! #Java #ExceptionHandling #Programming #CodingJourney #BTechLife #LearningEveryday

Day 52 of Sharing What I’ve Learned 🚀 LinkedList in Java — Advantages & Disadvantages After exploring how LinkedList powers structures like Queue, I took a step back to understand something important — 👉 When should we actually use LinkedList, and when should we avoid it? 🔹 Advantages of LinkedList ✔ Dynamic Size No need to define size in advance — it grows and shrinks as needed. ✔ Efficient Insertions & Deletions Adding/removing elements is fast, especially at the beginning or middle. (No shifting like arrays!) ✔ Memory Utilization (Flexible Allocation) Memory is allocated as needed, not wasted upfront. ✔ Implements Multiple Structures Can be used as: ✔ List ✔ Queue ✔ Deque 🔹 Disadvantages of LinkedList ❌ More Memory Usage Each node stores extra references (pointers), increasing memory overhead. ❌ Slow Access (No Indexing) Unlike ArrayList, you can’t directly access elements — traversal is required. ❌ Poor Cache Performance Elements are not stored contiguously → slower compared to arrays. ❌ Not Ideal for Searching Searching is O(n), making it inefficient for large datasets. 🔹 LinkedList vs ArrayList (Quick Insight) 👉 Use LinkedList when: ✔ Frequent insertions/deletions ✔ Working with Queue/Deque 👉 Use ArrayList when: ✔ Fast access is needed ✔ More read operations than write 🔹 Key Insight 💡 Every data structure has trade-offs — 👉 The real skill is knowing when to use which one. 🔹 Day 52 Realization 🎯 Understanding limitations is just as important as learning features — That’s what makes you a better problem solver. #Java #LinkedList #DataStructures #CollectionsFramework #Programming #DeveloperJourney #100DaysOfCode #Day52 Grateful for guidance from, Sharath R TAP Academy

Day 37 of Learning Java Today I learned something interesting Illegal Forward Reference in Java. At first, it sounded complicated, but once I understood it, it actually made a lot of sense! Here’s what I learned: 🔹 What is Illegal Forward Reference?   • It happens when you try to use a variable before it is declared.   • Java doesn’t allow referencing a variable that comes later in the code. 🔹 Why does it happen?   • Java reads code from top to bottom.   • If a variable is used before it exists, the compiler throws an error. 🔹 Example of the issue:   • Using a variable before declaring & defining it to a compile-time error. 🔹 How to fix it?   • Always declare variables before using them.   • we have to call static variable using ClassName.VarName. Thanks to my mentor Ashim Prem Mahto for the clear explanations and for always clearing my doubts. #Java #LearningJava #CodingJourney #Programming #DeveloperLife #CodeNewbie #JavaDeveloper #TechLearning #StudentLife #jvm

📘 Day 23 of My Java Learning Journey Today I explored one of the core concepts of Object-Oriented Programming, Inheritance in Java 💡 🔹 Inheritance represents an “is-a relationship” 🔹 It allows one class to acquire properties and behaviors of another 🔹 It helps in code reusability and reduces code duplication 📚 I covered the following types of inheritance: • Single Inheritance • Multilevel Inheritance • Hierarchical Inheritance ⚠️ I learned about Multiple Inheritance and the Diamond Problem, but since Java doesn’t support it using classes, it is achieved using interfaces. 👉 I’ve decided to skip Multiple and Hybrid Inheritance for now and will revisit them after completing Interfaces for better clarity. 💻 I also implemented example programs with proper code and output to strengthen my understanding. Step by step, building a strong foundation in Java 💪 #JavaDeveloper #CoreJava #ObjectOrientedProgramming #JavaLearning #CodeNewbie #DeveloperJourney #LearnToCode #ProgrammingLife #FutureDeveloper

🚀 Day 34 of Learning Java — File Handling! 📂 Today I explored File Handling in Java, and it was such a great learning experience! Here's what I practiced: ✅ How to check if a file exists using the File class ✅ How to create a new file using createNewFile() ✅ How to write data to a file using FileOutputStream in append mode (true flag keeps existing data safe!) ✅ How to convert a String to bytes using getBytes() and write it to a file 🔍 Key Concept from Today's Code: My program first checks if a file exists at a given location. If it does, it directly appends new data to it. If not, it creates the file first and then writes the data — making it smart and reusable! 💡 One thing I learned: Using FileOutputStream(location, true) appends data instead of overwriting it. Such a small detail but so important! A big thank you to my mentor Raviteja T for the amazing guidance and support throughout this journey! 🙏 #Java #JavaProgramming #FileHandling #Day34 #LearningJava #CodingJourney #JavaDeveloper #Programming #CodeNewbie #TechLearning #JavaBeginners