Aman Gupta’s Post

->A simple Java concept that’s easy to overlook 👇 Immutable Strings 🔒 String str = "hello"; str.concat(" world"); System.out.println(str); // still "hello" Strings don’t change after creation. Operations like concat() create a new object instead ♻️ str=str.concat(" world"); System.out.println(str); // "hello world" Small detail ⚡ But important while writing logic 🧠 #Java #BackendDevelopment #Programming

💻 Day 23 – Strings in Java Today I explored Strings in Java, one of the most fundamental and important concepts. I learned about different types of string handling: 🔹 String – Immutable (cannot be changed) 🔹 StringBuilder – Mutable and faster 🔹 StringBuffer – Mutable and thread-safe Understanding immutability was a key highlight today, as it plays an important role in memory management and performance. 💡 Key takeaway: Choosing the right type of string handling improves both performance and efficiency in Java applications. Continuing to strengthen my core Java concepts step by step 🚀 #Java #Strings #Programming #LearningInPublic #CodingJourney #Day23

LeetCode Practice - 11. Container with Most Water The program is solved using JAVA. 🔑 Logic Summary 1. Take two pointers (start and end) 2. Calculate area 3. Store max area 4. Move smaller height pointer 5. Repeat until pointers meet #LeetCode #Java #CodingPractice #ProblemSolving #DSA #Array #DeveloperJourney #TechLearning

#TapAcademy #Java #Fullstackdeveloment #Strings Strings in Java are used to store and handle text data. They are created using double quotes. For example, String text = "Hello, World!". Java offers many useful string methods, such as concat(), substring(), and toUpperCase(). You can compare, join, and format strings with these built-in methods. Strings are commonly used for managing text input, output, and data processing in programs.

Solved Simple Array Sum using LinkedList in Java 8 💻📊 Today I worked on the Simple Array Sum problem and implemented it using LinkedList in Java 8. 💡 What I learned: How to convert a List into a LinkedList Traversing elements efficiently using loops Using Java 8 Streams for cleaner and shorter code ⚙️ Approach: Converted input list into a LinkedList Iterated through elements and calculated sum Also explored stream().mapToInt().sum() for optimized solution 📌 Key Takeaway: Even simple problems help strengthen core concepts like data structures and improve coding efficiency. ⚡ Time Complexity: O(n) ⚡ Space Complexity: O(n) 👨💻 Consistent practice is helping me improve my problem-solving skills step by step. #Java #Java8 #LinkedList #Coding #ProblemSolving

Today I learned the difference between ArrayList and LinkedList in Java Collections. Both allow null values and duplicate elements, but they differ in performance and internal structure: 🔹 ArrayList: * Backed by a dynamic array * Faster for accessing elements (random access) * Slower for insertions and deletions (especially in the middle) * Provides three constructors 🔹 LinkedList: * Based on a doubly linked list * Faster for insertions and deletions * Slower for accessing elements (sequential traversal) * Provides two constructors Understanding when to use each helps in writing more efficient and optimized code. #Java #Collections #LearningJourney #DataStructures #TapAcademy

📒 Day 27: final Keyword in Java 🔥 Java’s way of saying: “Modify me? Compile error loading…” 😎 In Java, the final keyword is used to apply restrictions on variables, methods, and classes to ensure immutability and controlled usage in object-oriented programming. 👉 Uses of final keyword: » 🔹 final variable → value cannot be changed once assigned » 🔹 final method → cannot be overridden in a subclass » 🔹 final class → cannot be extended or inherited 💡 Conclusion: The final keyword helps in achieving security, consistency, and controlled design in Java applications. #Java #CoreJava #OOP #Programming #Coding #LearnInPublic #100DaysOfCode #SoftwareDevelopment #JavaDeveloper #CodingJourney #final #finalkeyword

** Constructor Overloading in Java — One concept, multiple ways to initialize! -->Ever wondered how a single class can be created in multiple ways? That's the power of Constructor Overloading in Java. ** What is it? -->Defining multiple constructors in the same class with different parameter lists. Java picks the right one based on the arguments you pass. ✅ 3 Steps: 1️⃣ Define constructors with different signatures 2️⃣ Create objects — Java auto-selects the right constructor 3️⃣ Use this() for constructor chaining to avoid repetition 🔑 Key Rules: • Same name as the class • Differ in number, type, or order of parameters • No return type • this() must be the first statement Constructor overloading = flexible, clean, reusable code. Master it and object creation becomes effortless! 💡 #Java #OOP #Programming #ConstructorOverloading #JavaDeveloper #CodeNewbie #LearnJava #SoftwareDevelopment

Today I learned about Abstraction in Java. Abstraction is a core concept of Object-Oriented Programming that focuses on hiding implementation details and showing only essential functionality. To understand it better, I implemented a simple payment system using an abstract class. Through this example, I understood: - How abstract classes work - How implementation is hidden from the user - How different behaviors can be achieved using the same structure I’m continuing to strengthen my understanding of Java and OOP concepts. #Java #Abstraction #OOP #LearningJourney

Day 37/100 – File Handling & Multithreading in Java ⚙️ Today I explored writing data into files using Java along with a basic understanding of multithreading. I worked on creating a program that writes content into a file using a separate thread, which helps in performing tasks concurrently. Key learnings: • Writing data into files in Java • Basics of multithreading using threads • Executing tasks in a separate thread using start() • Understanding how parallel execution improves performance This gave me a glimpse into how real-world applications handle background tasks efficiently. Learning something new every day and connecting concepts step by step. 🚀 #100DaysOfCode #Java #Multithreading #FileHandling #CodingJourney #LearningInPublic