Java Strings: Length, Substring, Upper/Lower Case & More

Day 27/100 – Java Programming Journey. Today I learned about static methods in Java and how they behave based on return types and parameters. This topic cleared many small but important doubts. 🔹 Types of static methods I learned 1️⃣ Static method without return value (void) Used when a method performs an action but doesn’t send anything back. 2️⃣ Static method with return value (int, double, etc.) Used when a method processes data and returns a result to the caller. 3️⃣ Static method with parameters Example: static int add(int a, int b) Here I learned an important rule: Each parameter must have its own data type Writing int a, b is valid only inside a method body, not in the parameter list 4️⃣ Static method without parameters Used when no external input is required and the logic is fixed. 🔹 Parameter vs Argument (very important) Parameter → acts like a container that receives values Argument → the actual value passed to the method during the call ⚠️ Interview Question I learned today What happens if we write statements after a return statement? 👉 They cause a compile-time error because return ends the method execution. Any code written after it becomes unreachable. 💡 Understanding static methods helps in writing utility functions, reusable logic, and clean program flow. Learning step by step and clearing fundamentals. #Java #StaticMethods #ProgrammingBasics #100DaysOfCode #LearningJourney #InterviewPrep 10000 Coders Meghana M

Understand the concept of class and object in Java. Learn how to define classes and create objects with practical examples

Day 10 - 🚀 Increment and Decrement Operators in Java Understanding increment (++) and decrement (--) operators is essential for every Java programmer. These operators are commonly used in loops, counters, and logic-building. 🔹 What are Increment and Decrement Operators? ✅ Increment (++) → Increases a variable’s value by 1 ✅ Decrement (--) → Decreases a variable’s value by 1 🔹 Types of Increment & Decrement Java provides two ways to use these operators: 1️⃣ Pre-Increment / Pre-Decrement The value changes before it is used in an expression. int a = 5; int b = ++a; // a becomes 6, then b = 6 int x = 5; int y = --x; // x becomes 4, then y = 4 📌 First change happens, then assignment. 2️⃣ Post-Increment / Post-Decrement The value is used first, then it changes. int a = 5; int b = a++; // b = 5, then a becomes 6 int x = 5; int y = x--; // y = 5, then x becomes 4 📌 First assignment happens, then change. 🔹 Key Difference at a Glance Operator Meaning When Value Changes ++a Pre-increment Before use a++ Post-increment After use --a Pre-decrement Before use a-- Post-decrement After use 💡 Where are they used? ✔ Loop counters (for, while) ✔ Array indexing ✔ Game scores, timers, and tracking values Mastering these small operators makes your logic cleaner and your code more efficient! 💻✨ #Java #Programming #CodingBasics #JavaLearning #Developers

In this article, I have shared the key Java core concepts that form the foundation of Java programming. Understanding these basics has helped me improve code structure, clarity, and problem-solving skills while learning Java. #Java #JavaProgramming #JavaCore #OOPConcepts #SoftwareEngineering #ProgrammingBasics #LearningJava #StudentDeveloper https://lnkd.in/g37rWZFc

I’ve written an article on Java where I explain [brief topic – e.g., Java basics / OOP concepts / memory management] in a simple and practical way. This article is especially useful for beginners and students who are starting their Java journey. 📖 Read here: Java — The Master of Modern Programming https://lnkd.in/ghADQehd I’d love to hear your thoughts and feedback! #Java #Programming #SoftwareDevelopment #LearningJava #MediumArticle

Day 6 – Strengthening Java Fundamentals 🚀 Today’s session focused on some of the most important and frequently tested Java concepts that play a major role in interviews and real-world coding. 🔹 Increment & Decrement (Golden Rules) Understood the difference between pre-increment (++a) and post-increment (a++) and how they affect the value during execution, not the variable itself. 🔹 Operator Precedence & Associativity Learned how Java evaluates complex expressions using: Parenthesis first Increment/Decrement Arithmetic operators Assignment Also understood left-to-right associativity when precedence is the same. 🔹 Integer Division – Common Interview Trap Explored why expressions like 10 / 121 return 0 👉 Because int / int → int, and the decimal part is discarded. 🔹 Complex Expression Evaluation Solved step-by-step expressions by: Following precedence rules Applying pre/post increment carefully Writing values instead of guessing 🔹 Hard Coding vs Dynamic Input Why hard coding is a bad practice and how dynamic input makes programs flexible and reusable. 🔹 Scanner Class (User Input Handling) Learned how Java takes input from the keyboard using java.util.Scanner and how the program waits, reads input, stores values, and continues execution. 🔹 Interview Communication Tips Realized that how we explain matters as much as what we know. Clear, structured answers always stand out. 📌 Trainer’s Advice That Stuck With Me: Knowledge + Communication = Selection Consistent learning, daily practice, and improving explanations step by step. Excited to keep moving forward 💻🔥 #Java #CoreJava #ProgrammingFundamentals #LearningInPublic #InterviewPreparation #TapAcademy #JavaDeveloper #Day5 #Consistency

🔥 DAY 25 – JAVA LEARNING SERIES After wrapper classes, it’s time to work with the most frequently used class in Java applications. This topic is asked in almost every Java interview and used daily in real world projects. 💡💻 📘 Today’s Focus: String Handling in Java 🔹 What is String and why it is immutable 🔹 String pool and memory concept 🔹 Creating String using literal vs new keyword 🔹 String vs StringBuilder vs StringBuffer 🔹 Commonly used String methods 🔹 String related interview questions 📝 Practice Questions for Day 25 1️⃣ Check whether two Strings are equal using == and .equals() 2️⃣ Reverse a String using StringBuilder 3️⃣ Count vowels and consonants in a String 4️⃣ Check if a String is palindrome 5️⃣ Demonstrate immutability of String with an example Are Strings making sense now? Comment CLEAR or NEED PRACTICE 👇 #Java #JavaLearning #CoreJava #StringHandling #JavaDeveloper #ProgrammingJourney #100DaysOfCode #InterviewPreparation #CodingPractice #BackendDeveloper

🔥 DAY 24 – JAVA LEARNING SERIES After collections, it’s time to understand how Java bridges primitive data types with objects. This concept is widely used in collections, frameworks, and interview questions. 💡💻 📘 Today’s Focus: Wrapper Classes in Java 🔹 Why wrapper classes are needed 🔹 List of wrapper classes in Java 🔹 Primitive data types vs Wrapper classes 🔹 Autoboxing and Unboxing 🔹 Wrapper classes usage in Collections 🔹 Common interview questions on wrapper classes 📝 Practice Questions for Day 24 1️⃣ Convert primitive data to wrapper object and vice versa 2️⃣ Demonstrate autoboxing and unboxing with example 3️⃣ Store primitive values in an ArrayList using wrapper classes 4️⃣ Compare == and .equals() with wrapper objects 5️⃣ Explain why collections cannot store primitive data Are wrapper classes clear now? Comment CLEAR or CONFUSED 👇 #Java #JavaLearning #CoreJava #WrapperClasses #JavaDeveloper #ProgrammingJourney #100DaysOfCode #InterviewPreparation #Collections #BackendDeveloper