Aishwarya Raj Laxmi’s Post

Day 8 – Java OOPS Revision Today I revised some important Java interview topics: Abstract class: what it is and why we use it Abstract class vs Interface (detailed) Can an interface have methods with body? (default/static methods) Why Java doesn’t support multiple inheritance with classes How Java achieves multiple inheritance using interfaces Constructors: what they are and types of constructors Can we override a constructor? Object cloning basics Garbage collection in Java Stack memory vs Heap memory JVM vs JRE vs JDK finally block (with example) finalize() method and whether it is deprecated When to use abstract class over interface Next I’ll revise more oops concept. #java #oops #interviewprep #placements #learning

Today I revised Java Wrapper Classes and understood why they are important. Java Collections store only objects, not primitive types — so wrapper classes help convert primitives like int, double, char into objects like Integer, Double, Character. Also practiced Auto-Boxing and Auto-Unboxing, which makes conversion between primitive and object types seamless. Small concept, but very important for writing clean Java code 🚀 Saketh Kallepu Anand Kumar Buddarapu #Java #WrapperClasses #AutoBoxing #JavaCollections #LearningJourney

🔥 Checked vs Unchecked Exceptions in Java Many Java developers get confused about exceptions. ✅ Checked Exceptions ~ Checked at compile time ~ Must be handled or declared using try-catch or throws ~ Examples: IOException, SQLException ✅ Unchecked Exceptions ~ Occur at runtime ~ No need to handle explicitly ~ Examples: ArithmeticException, NullPointerException Which exception do you encounter most in your Java projects? #java #backend #exception #softwaredevelopment

Mastering Java Collection Framework starts with understanding the core difference between List and Set. ✔ List → Allows duplicates & maintains insertion order ✔ Set → Stores unique elements only Here are my quick revision notes 👇 #JavaProgramming #BackendDeveloper #CodingJourney

Comparable vs Comparator Understanding the difference between Comparable and Comparator is essential for writing clean and flexible sorting logic in Java. This infographic clearly explains: ✔ Default vs Custom sorting ✔ compareTo() vs compare() ✔ When to use each ✔ Java 8 modern approach with lambdas Master this concept to improve your Collections knowledge and crack Java interviews with confidence 🚀 #Java #JavaDeveloper #CollectionsFramework #BackendDevelopment #SpringBoot #CodingInterview

⚠️ Java isn’t wrong — your comparison is Ever seen this in Java? 👇 Integer a = 1000; Integer b = 1000; System.out.println(a == b); // false Integer x = 1; Integer y = 1; System.out.println(x == y); // true Same type, same value… different results. Why? 🤔 Because of the Integer Cache. Java caches Integer values from -128 to 127. What you should know: Inside this range → same object → true Outside this range → new objects → false ✅ Best practice Always compare values with: a.equals(b); This is not a bug — it’s a performance optimization. 👉 == compares references 👉 .equals() compares values Have you ever been surprised by this in Java? 😄 https://lnkd.in/ezUTGcdw #Java #JavaDeveloper #SoftwareDevelopment #Programming #BestPractices #CleanCode #CodeQuality

🚀 100 Days of Java Tips – Day 4 Topic: String vs StringBuilder 💡 Java Tip of the Day Choosing between String and StringBuilder can have a direct impact on performance, especially in real-world applications. Key Difference String → Immutable (cannot be changed once created) StringBuilder → Mutable (can be modified) 🤔 Why does this matter? Every time you modify a String, a new object is created in memory. This makes String slower when used repeatedly, such as inside loops. ❌ Using String in loops String result = ""; for(String s : list) { result = result + s; } ✅ Better approach with StringBuilder StringBuilder sb = new StringBuilder(); for(String s : list) { sb.append(s); } ✅ When should you use StringBuilder? Frequent string modifications Loops or large text processing Performance-sensitive code paths 📌 Key Takeaway Use StringBuilder for frequent modifications and String for fixed or read-only text. 👉 Save this for performance tuning 👉 Comment “Day 5” if this helped #Java #100DaysOfJava #JavaDeveloper #BackendDeveloper #CleanCode #PerformanceTips #LearningInPublic

#Corejava #Linkedin #interviewpratices #simpleanswer What is a static method in Java? Ans: A static method is a method that belongs to the class, not to the object. That means you don’t need to create an object to use it

🚀 Sharing my Java Reference Guide! I’ve created a structured Java Reference Guide to help students and beginners quickly revise core Java concepts in one place. 🔗 Explore here: https://lnkd.in/g8wGDq8r This guide covers important topics like Collections, Java 8 features, and modern Java concepts in a simple and organized format. My goal was to build something practical that I myself could use for quick revision during coding practice and interviews — and now I’m sharing it for the benefit of others as well. Feedback, suggestions, and contributions are always welcome! #Java #Programming#Coding