Java Pattern Matching with instanceof in Spring Boot

💡 𝗝𝗮𝘃𝗮/𝐒𝐩𝐫𝐢𝐧𝐠 𝐁𝐨𝐨𝐭 𝐂𝐥𝐞𝐚𝐧 𝐂𝐨𝐝𝐞 𝐓𝐢𝐩 🔥  💎𝗪𝗵𝗮𝘁 𝗶𝘀 𝗣𝗮𝘁𝘁𝗲𝗿𝗻 𝗠𝗮𝘁𝗰𝗵𝗶𝗻𝗴 𝗳𝗼𝗿 𝗶𝗻𝘀𝘁𝗮𝗻𝗰𝗲𝗼𝗳 Introduced in Java 16 and finalized in Java 17, Pattern Matching for instanceof allows you to test object types and access their properties without verbose type checks and manual casting. It transforms repetitive instanceof-cast chains into clean, declarative expressions that clearly communicate your intent. ✅ 𝗞𝗲𝘆 𝗔𝗱𝘃𝗮𝗻𝘁𝗮𝗴𝗲𝘀 ◾ 𝗖𝗼𝗻𝗰𝗶𝘀𝗲𝗻𝗲𝘀𝘀: Combines type check, casting, and property access into a single readable expression. ◾ 𝗘𝘅𝗽𝗿𝗲𝘀𝘀𝗶𝘃𝗲𝗻𝗲𝘀𝘀: Enables direct method calls and reduces boilerplate code significantly. ◾ 𝗧𝘆𝗽𝗲 𝗦𝗮𝗳𝗲𝘁𝘆: Compile-time validation prevents casting errors and ensures type correctness. 🤔 Which one do you prefer? #java #springboot #programming #softwareengineering #softwaredevelopment

Day 16-What I Learned In a Day(JAVA) 🔹 Assignment Operators Used to assign and update values in variables. Symbols: =, += ,-=, *=, /= ,%= . 🔹 Relational Operators Used to compare two values and return true or false. Symbols: > ,<, >=, <=, == ,!= . 🔹 Conditional (Ternary) Operator Short form of if-else used for simple decision making. Symbol: condition ? value1 : value2; 🔹 Type Casting Used to convert one datatype into another (Widening & Narrowing). Symbol: (datatype) Practiced 👇 #Java #JavaLearning #ProgrammingBasics #CodingJourney #SoftwareDevelopment #LearnToCode

Day 5 | Problem 1 – Score of a String Today I practised calculating the score of a string by finding the absolute difference between adjacent characters. Approach used: • Traverse the string from left to right • Calculate the absolute ASCII difference between consecutive characters • Add each difference to a running sum • Return the final score This problem helped me better understand character handling in strings, ASCII values, and loop-based traversal. #Java #DSA #StringProblems #LearningInPublic #Consistency

🚀 Day 31 of Importance of Static block, Static variables and Static methods Today, I explored one of the most important concepts in Java – Static Keyword 🔥 🔹 Static Variables Belong to the class, not to objects. Only one copy is created and shared among all instances. Memory is allocated only once when the class is loaded. Accessed using the class name. 🔹 Static Methods Belong to the class rather than an object. Can be called without creating an object. Mostly used for utility methods. Cannot directly access non-static instance variables. 🔹 Static Block Executes when the class is loaded into memory. Used to initialize static variables. Runs before constructors. Executes only once. Static members are shared resources of a class. They improve memory efficiency and are perfect for common data or utility logic. Understanding how static works also helped me visualize JVM memory concepts like Class Area, Stack, and Heap. #Day31 #Java #LearningJourney #StaticKeyword #Programming #BackendDevelopment

Day 14- What I Learned in a Day(JAVA) Concatenation Operator :("+") • Used to combine two or more strings • Commonly used to join text with variables • Helps in displaying meaningful output messages Increment Operator: • Used to increase a variable value by one • Can be used in pre-increment(++varname) and post-increment(varname ++) form Decrement Operator: • Used to decrease a variable value by one • Can be used in pre-decrement(--varname) and post-decrement(varname--) form. 🔹 I practiced small programs to understand how these operators behave during execution and how output changes based on their usage. Practiced 👇 #Java #JavaProgramming #OperatorsInJava #CodingPractice #LearningJourney #ProgrammingLife #TechSkills #FutureDeveloper 🚀

𝗦𝘁𝗿𝗶𝗻𝗴𝗕𝘂𝗶𝗹𝗱𝗲𝗿 𝘃𝘀 𝗦𝘁𝗿𝗶𝗻𝗴𝗕𝘂𝗳𝗳𝗲𝗿 𝗶𝗻 𝗝𝗮𝘃𝗮 — 𝗪𝗵𝗮𝘁’𝘀 𝘁𝗵𝗲 𝗗𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝗰𝗲? When working with strings in Java, performance and thread safety matter. That’s where StringBuilder and StringBuffer come in. ✅ StringBuilder - Faster performance - Not thread-safe - Best for single-threaded environments ✅ StringBuffer - Thread-safe (synchronized) - Slightly slower due to synchronization - Best for multi-threaded applications 💡 Both are mutable, unlike String — which means they can modify content without creating new objects, making them memory-efficient for heavy string operations. 👉 Use StringBuilder for speed, and StringBuffer when thread safety is required. #Java #StringBuilder #StringBuffer #JavaProgramming #CoreJava #ProgrammingConcepts #JavaInterview #DeveloperTips #Coding #SoftwareDevelopment

Day: 43/365 📌 LeetCode POTD: Binary Number with Alternating Bits Easy Key takeaways/Learnings from this problem: 1. This one shows how clean bit tricks can replace messy string checks when working with binary patterns. 2. Big takeaway: sometimes a small observation (like using XOR or shifting) turns a pattern problem into a super neat one-liner. #POTD #365DaysOfCode #DSA #Java #ProblemSolving #LearningInPublic #Consistency 🥷

💡 𝗝𝗮𝘃𝗮/𝐒𝐩𝐫𝐢𝐧𝐠 𝐁𝐨𝐨𝐭 𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐓𝐢𝐩 🔥 💎 𝗣𝗿𝗲𝗳𝗲𝗿 𝗦𝘁𝗿𝗶𝗻𝗴𝗕𝘂𝗶𝗹𝗱𝗲𝗿 𝗢𝘃𝗲𝗿 𝗦𝘁𝗿𝗶𝗻𝗴 𝗖𝗼𝗻𝗰𝗮𝘁𝗲𝗻𝗮𝘁𝗶𝗼𝗻 𝗶𝗻 𝗟𝗼𝗼𝗽𝘀 🐌 𝗧𝗵𝗲 𝗣𝗿𝗼𝗯𝗹𝗲𝗺 𝘄𝗶𝘁𝗵 𝗦𝘁𝗿𝗶𝗻𝗴 𝗖𝗼𝗻𝗰𝗮𝘁𝗲𝗻𝗮𝘁𝗶𝗼𝗻  Strings are immutable in Java, so the '+' operator creates a new String object with every concatenation. In loops, this creates thousands of temporary objects that need to be garbage collected. This dramatically impacts both performance and memory usage. 🔥 𝗪𝗵𝘆 𝗦𝘁𝗿𝗶𝗻𝗴𝗕𝘂𝗶𝗹𝗱𝗲𝗿 𝗶𝘀 𝗕𝗲𝘁𝘁𝗲𝗿 StringBuilder uses a mutable character buffer and modifies it in place without creating new objects. In benchmarks with 10,000 iterations, StringBuilder completes in ~4ms while '+' operator takes ~400ms. That's 100x faster with significantly lower memory allocation. ✅ 𝗪𝗵𝗲𝗻 𝘁𝗼 𝗨𝘀𝗲 𝗘𝗮𝗰𝗵 ◾ Use StringBuilder for loops and multiple concatenations. ◾ Use '+' for simple, single-line string building (2-3 strings). ◾ The compiler optimizes simple '+' usage, but not in loops. #java #springboot #programming #softwareengineering #softwaredevelopment

Java Jump Scares Series #4 When clean code lies - Autoboxing Consider the following code snippet: ```java static void run(Long x) { System.out.println("Long"); } static void run(Integer x) { System.out.println("Integer"); } run(10); ``` We would expect the Integer version to be invoked — after all, 10 fits naturally into an Integer, but Java prints Long! Why does this happen? Method overloading in Java is resolved entirely at compile time and follows a strict conversion hierarchy defined by the Java Language Specification: - int → Integer → autoboxing - int → long → Long → primitive widening + boxing Primitive widening is preferred over autoboxing. The compiler didn’t guess wrong — it just understood Java better than we did. ☕👻 #JavaDeveloper #BackendEngineer #SoftwareEngineer #JavaProgramming #JVM #APIDesign #CodeQuality #ProgrammingPitfalls