Java String vs StringBuffer vs StringBuilder vs StringTokenizer Explained

Week 3 - Day 16 : Vector in java A vector in java is a part of the java.util.package and is one of the legacy classes in java that implements the list interface. Key features of an vector : 1) Dynamic Array : Like Arraylist, Vector is a Dynamic array that grows automatically when more elements, are added then the current capacity. 2) Synchronized : All the methods in vector are Synchronized, which make it thread safe .This means multiple thread can work on a vector without the risk of corrupting the data. 3) Legacy class : Vector was part of java original release and is considered legacy class. It's generally recommended to use Arraylist in single thread environments due to performance consideration. 4) Resizing mechanism : When the current capacity of the vector is exceeded, it doubles it's size by default. 5) Random Access : Similar to arrays and Arraylist, vector allows random access to elements, making it efficient for accessing elements using an index . #java #programming #javacore #vector #learning EchoBrains

🧵 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-17: 🌳 Understanding Strings in Java – A Real-World Example Learning Java becomes easier when we connect concepts to real life. This image explains Strings in Java using trees as an example: 🔹 Single Tree with One Rope – Just like a simple string reference. 🔹 Multiple Trees Connected by Ropes – Represents the String Pool, where identical string values share memory. 🔹 Separate Trees with Separate Ropes – Represents new String() objects, which create new memory even if the value is the same. 💡 Key Insight: In Java, string literals share memory inside the String Pool to optimize performance, while using new String() creates a new object in heap memory. Understanding this concept helps in: ✅ Writing memory-efficient code ✅ Avoiding unnecessary object creation ✅ Improving performance in large applications Sometimes, the best way to understand programming is to visualize it in nature 🌱 #Java #Programming #CodingLife #JavaDeveloper #LearningJourney #TechConcepts

✨DAY-17: 🌳 Understanding Strings in Java – A Real-World Example Learning Java becomes easier when we connect concepts to real life. This image explains Strings in Java using trees as an example: 🔹 Single Tree with One Rope – Just like a simple string reference. 🔹 Multiple Trees Connected by Ropes – Represents the String Pool, where identical string values share memory. 🔹 Separate Trees with Separate Ropes – Represents new String() objects, which create new memory even if the value is the same. 💡 Key Insight: In Java, string literals share memory inside the String Pool to optimize performance, while using new String() creates a new object in heap memory. Understanding this concept helps in: ✅ Writing memory-efficient code ✅ Avoiding unnecessary object creation ✅ Improving performance in large applications Sometimes, the best way to understand programming is to visualize it in nature 🌱 #Java #Programming #CodingLife #JavaDeveloper #LearningJourney #TechConcepts

🚀 Java Revision Journey – Day 07 Continuing my Java revision journey, today I focused on the four pillars of Object-Oriented Programming (OOP) in Java. 🔖 Topics Covered 1️⃣ Inheritance Allows one class to acquire the properties and behaviors of another class using the extends keyword. It promotes code reusability and hierarchical relationships between classes. 2️⃣ Encapsulation Wrapping data (variables) and methods into a single unit (class) and restricting direct access using private variables with getters and setters. It ensures data security and controlled access. 3️⃣ Polymorphism Means “many forms”. The same method name can behave differently depending on the situation. Examples: Method Overloading (Compile-time polymorphism) Method Overriding (Runtime polymorphism) 4️⃣ Abstraction Hiding internal implementation details and showing only essential functionality using abstract classes and interfaces. 📌 These four concepts form the foundation of Object-Oriented Programming and scalable Java application design. Every day of revision is strengthening my Java fundamentals step by step. 💻 #Java #OOP #JavaDeveloper #JavaLearning #BackendDevelopment #Programming #JavaRevision #LearningJourney

While learning core Java concepts, I recently explored the Collection Hierarchy, and it gave me a clearer understanding of how Java manages and organizes groups of objects efficiently. The Java Collection Framework provides a set of interfaces and classes designed to store, retrieve, and manipulate data in different ways depending on the requirement. 🔹 List – Maintains insertion order and allows duplicate elements. Examples: ArrayList, LinkedList, Vector, Stack. 🔹 Set – Stores only unique elements and prevents duplication. Examples: HashSet, LinkedHashSet, TreeSet. 🔹 Queue – Designed for processing elements typically in FIFO (First In First Out) order. Examples: PriorityQueue, ArrayDeque. Understanding this hierarchy helps developers choose the right data structure based on ordering, uniqueness, and performance requirements. #Java #JavaCollections #SoftwareDevelopment #JavaDeveloper #Programming #Learning

Day 27-What I Learned In a Day(JAVA) Java Revision – Decision Making Statements Today I revised all the Decision Making Statements in Java as part of my preparation. I went through concepts like: ✔️ if statement ✔️ if-else statement ✔️ else-if ladder ✔️ nested if ✔️ switch statement Understanding these concepts helps in controlling the flow of a program based on different conditions. Practicing them improved my logical thinking and programming skills. #Java #Programming #LearningJava #CodingJourney #StudentDeveloper

🚀 Day 7/45 – Working with Strings in Java On Day 7 of my Java learning journey, I explored the concept of Strings, which are used to store and manipulate text data in programs. Strings are widely used in almost every application, from user input to data processing. 📚 What I Learned Today Today I learned: ✔ What strings are and how they are created in Java ✔ Important string methods like length(), charAt(), and toUpperCase() ✔ How to compare strings using equals() ✔ Understanding case-sensitive and case-insensitive comparisons 💻 Practice Work To strengthen my understanding, I implemented: • A program to reverse a string • A program to count characters in a string • A palindrome checker using string logic 🎯 Key Takeaway Strings are a fundamental part of programming, and mastering string manipulation is essential for solving real-world problems. Consistent daily practice is helping me build strong fundamentals step by step. #Java #Programming #LearningInPublic #CodingJourney #SoftwareDevelopment #Consistency

Multithreading is one of the most powerful features in Java. But it’s also one of the most confusing topics when you start learning it. Concepts like thread lifecycle, synchronization, and deadlocks can feel overwhelming at first. I recently came across this Java Thread Cheat Sheet and found it really helpful as a quick reference. It summarizes important concepts like: • What a thread and process are • How to create threads (Thread class vs Runnable) • Important thread methods (start(), sleep(), join(), wait(), notify()) • Thread lifecycle and states • Synchronization and deadlocks • User threads vs daemon threads Understanding these fundamentals is essential when building high-performance backend systems or preparing for Java interviews. Sharing it here in case it helps someone revising Java multithreading basics. Which Java multithreading concept took you the longest to understand? 🤔 #Java #Multithreading #BackendDevelopment #Programming #SoftwareEngineering

🔹 Java Concept of the Day 📌 Can we use string as a variable name in Java? Yes ✅ Java is case-sensitive, so: String → Predefined class (used to store text) string → Just a normal variable name Example: int string = 10; System.out.println(string); ✔ Output: 10 But ⚠ this is not a good practice because it creates confusion between the String class and the variable name. 💡 Best Practice: Always use meaningful and clear variable names like: int number = 10; 🧠 Key Learning: In Java, identifiers are case-sensitive, but good naming conventions make your code more readable and professional. #Java #Programming #CodingBasics #DSA #LearningInPublic #JavaDeveloper