NullPointerException in Java: Always Check for Null

🚀 Day 18 – Core Java Programming Series Today, I learned about Method Overloading in Java. 🔹 What is Method Overloading? Method Overloading means defining multiple methods with the same name in the same class but with different parameters. The difference can be: ✅ Number of parameters ✅ Type of parameters ✅ Order of parameters 👉 It is an example of Compile-Time Polymorphism. 🔹 Why Do We Use Method Overloading? ✔️ Improves code readability ✔️ Increases flexibility ✔️ Helps in reusing method names for similar operations 💡 Today I solved 19 problems related to Method Overloading and strengthened my understanding of compile-time polymorphism. Consistency is the key to success. Learning something new every day! 🚀 #Java #CoreJava #MethodOverloading #Polymorphism #100DaysOfCode #LearningJourney

🔹 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

💻 Java Practice – String Operations Today I continued practicing Java String fundamentals. Worked on small exercises like: • Checking if a string is a palindrome • Counting words in a sentence • Replacing characters using replace() • Comparing strings correctly using equals() Also explored a small but important detail in string comparison and why some approaches are safer in real applications. Consistent practice with small problems helps strengthen programming fundamentals. #Java #ProgrammingFundamentals #LearningInPublic #DeveloperJourney #Consistency

Today I explained the concept of Inner Classes in Java, which is an important part of Object-Oriented Programming (OOP). In this session, we discussed how Composition (HAS-A Relationship) works and how Inner Classes help improve the structure and design of Java applications. 📌 Key Concepts Covered: Composition in Java HAS-A Relationship Inner Class Concept Advantages of Inner Classes Modularity Abstraction Security Shareability Reusability We also explored the types of Inner Classes: ✔ Static Nested Class ✔ Regular Inner Class ✔ Method Local Inner Class ✔ Anonymous Inner Class Understanding these concepts helps developers write better structured and more maintainable Java applications. If you are learning Core Java or Object-Oriented Programming, this topic is very important.

Java Tutorial 11 🚀 ► https://lnkd.in/gPicYgjH ► Learn about identifiers in Java with this tutorial. Understand their role as programmer-defined names for variables, constants, methods, classes, and more. Java Tutorials Playlist:  ► https://lnkd.in/gz2_iusM #JavaProgramming #LearnJava #Java #Programming #CodingLife #Codiing

💻 Java Practice – Arrays with Methods Saturday I worked on combining Java methods with array-based logic. Practiced: • Passing an array to a method • Writing a method to calculate the sum of an array • Finding the largest element using a method • Reversing an array through a method This helped connect DSA problem-solving with structured Java programming. Small exercises like these make it easier to understand how logic and program design work together. #Java #DSA #ProgrammingFundamentals #LearningInPublic #DeveloperJourney

Hello LinkedIn! Today I learned about Exception Handling in Java, which helps in handling runtime errors and keeping the program running smoothly. 📌 What I understood: ✅ What is an Exception ✅ Using try-catch blocks ✅ The finally block ✅ Types of Exceptions (Checked & Unchecked) ✅ Importance of handling errors in a program Exception handling helps developers write robust and reliable applications by preventing unexpected program crashes. Step by step, improving my Java fundamentals and programming skills 💻🔥 Consistency + Practice = Progress 🚀 #Java #Programming #ExceptionHandling #Coding #LearningJourney #Developer

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 Programming Practice – Count Vowels in a String. Today I practiced a Java program to count vowels in a string. 📌 What this program does: • Takes a string input from the user • Checks each character in the string • Identifies vowels (a, e, i, o, u) • Counts the total number of vowels ✅ Example: Input: RamanathapuramEducation Output: Vowels in the String = 10 💡 Concepts used in this program: ✔ Java Scanner input ✔ String methods ✔ For loop ✔ Conditional statements I am practicing Java programs daily to improve my coding and problem-solving skills for IT placements. #Java #Programming #CodingPractice #JavaDeveloper #Learning #SoftwareDevelopment

Day 5 of My Java Learning Journey Today I learned about Methods, Method Overloading, and Method Overriding in Java. >>Methods: A method is a block of code that performs a specific task. It helps in code reusability and makes the program more organized and readable. Basic structure of a method: *Access modifier *Return type *Method name *Parameters *Method body >>Method Overloading: Method overloading means having multiple methods with the same name but different parameters (different number or type of arguments) in the same class. >>Method Overriding: Method overriding happens when a child class provides its own implementation of a method that is already defined in the parent class. #Java #OOPS #MethodOverloading #MethodOverriding #LearningInPublic