Centralized Error Handling with Java @ControllerAdvice

💡 Tight Coupling vs Loose Coupling — 🔴 Tight Coupling When a class directly depends on a concrete implementation. ❌ Hard to change ❌ Difficult to test ❌ High maintenance 🟢 Loose Coupling When a class depends on an abstraction (interface) and dependencies are injected. ✔️ Flexible ✔️ Easy to test ✔️ Easy to extend 👉 In short: Tight coupling = “I will create my dependency” Loose coupling = “Provide me the dependency” This is why frameworks like Spring use Dependency Injection to build maintainable systems. #SpringBoot #Java #SystemDesign #CleanCode #DependencyInjection #SoftwareArchitecture

Learn how to extract distinct skills across all employees using Java Streams. Use flatMap and distinct() to eliminate duplicates cleanly! Link to video: https://lnkd.in/gy3gcgsC

📌 Command Design Pattern Explained (with Java example) The Command Pattern is a behavioral design pattern that encapsulates a request as an object, helping decouple the sender from the receiver. It is commonly used for: • Undo/redo functionality • Task queues • Logging and command history I wrote a short article explaining the concept with a simple and practical Java example. 📖 Read it here: https://lnkd.in/g4-XS8Dh #Java #DesignPatterns #SystemDesign #BackendDevelopment

☕ #ThinkingInJava — Post No. 5 💡 Tricky Java Question What will be the output? class Test { public static int m1() { int i = 10; try { return i; } finally { i = 20; System.out.println("finally block executed"); } } public static void main(String[] args) { System.out.println(m1()); } } ✅ Output finally block executed 10 🤔 Why not 20? When return i executes, Java first saves the return value internally. temp = i // temp = 10 Then the "finally" block runs, changing i to 20. But the method returns the saved value (10). 🎯 Key Concept 👉 The return value is evaluated before the `finally'. #Java #TestAutomationSpecialist #AutomationMeetsFuture

Day 45 — LeetCode Progress (Java) Problem: Intersection of Two Arrays Required: Given two integer arrays nums1 and nums2, return an array containing their unique intersection elements. Idea: Use a HashSet to efficiently track elements from the first array and check their presence in the second array. Approach: Create a HashSet to store all elements from nums1. Traverse nums1 and insert each element into the set. Initialize a list to store the intersection result. Iterate through nums2: If an element exists in the set: Add it to the result list. Remove it from the set to avoid duplicates. Convert the result list into an array and return it. Time Complexity: O(n + m) n = length of nums1 m = length of nums2 Space Complexity: O(n) #LeetCode #DSA #Java #HashSet #Arrays #CodingJourney #100DaysOfCode

It’s here! 🎉 2026 State of Java Survey & Report    Download the full report today and discover key metrics on Java trends, how your org compares, and more.     Download the free report: https://bit.ly/4bMValf    #StateOfJava #Java 

It’s here! 🎉 2026 State of Java Survey & Report    Download the full report today and discover key metrics on Java trends, how your org compares, and more.     Download the free report: https://bit.ly/4bMValf    #StateOfJava #Java 

It’s here! 🎉 2026 State of Java Survey & Report    Download the full report today and discover key metrics on Java trends, how your org compares, and more.     Download the free report: https://bit.ly/4bMValf    #StateOfJava #Java 

𝐉𝐚𝐯𝐚 | 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰 𝐐&𝐀 - 𝐅𝐮𝐧𝐜𝐭𝐢𝐨𝐧𝐚𝐥 𝐈𝐧𝐭𝐞𝐫𝐟𝐚𝐜𝐞 During a recent discussion, my friend was asked: “𝑫𝒐 𝒘𝒆 𝒏𝒆𝒆𝒅 𝒕𝒐 𝒖𝒔𝒆 @𝑭𝒖𝒏𝒄𝒕𝒊𝒐𝒏𝒂𝒍𝑰𝒏𝒕𝒆𝒓𝒇𝒂𝒄𝒆 𝒆𝒗𝒆𝒓𝒚 𝒕𝒊𝒎𝒆 𝒕𝒐 𝒅𝒆𝒇𝒊𝒏𝒆 𝒂𝒏 𝒊𝒏𝒕𝒆𝒓𝒇𝒂𝒄𝒆 𝒂𝒔 𝒂 𝒇𝒖𝒏𝒄𝒕𝒊𝒐𝒏𝒂𝒍 𝒊𝒏𝒕𝒆𝒓𝒇𝒂𝒄𝒆?” His immediate answer was yes. But the correct answer is no. In Java, an interface is considered a functional interface if it has exactly one abstract method. The @FunctionalInterface annotation is optional — it simply acts as a compile-time check and improves readability by clearly indicating the intent. #Java #BackendDevelopment #Learning #SoftwareEngineering #FunctionalProgramming #interviewprep

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 🚀