Noel KAMPHOA’s Post

Use "Anonymous class " to display " happy Java Class!" Here are the steps to create an anonymous class version in Eclipse: Step 1: Create a New Java Project (if not already created) Open Eclipse If you already have the project from Part 1, you can reuse it Otherwise, go to File → New → Java Project Name it "ButtonCallbackDemo" (or any name you prefer) Click Finish Step 2: Create/Ensure Required Files Make sure you already have: ClickListener.java interface Button.java class If not, create them as shown in the previous guide. Step 3: Create the Main2 Class with Anonymous Class Right-click on the src folder → New → Class Name it Main2 Check the box "public static void main(String[] args)" Click Finish Step 4: Add the Anonymous Class Code Eclipse will generate a basic class. Replace it with: java public class Main2 {    public static void main(String[] args) {        Button button = new Button();          // Anonymous class implementation        button.setClickListener(new ClickListener() {            @Override            public void onClick() {                System.out.println("Happy Java class!");            }        });          button.click();    } }

Build a barcode scanner in Java from the ground up. This tutorial walks through implementing barcode reading in Java applications for enterprise and backend workflows. Get started → https://lnkd.in/gtpUitza #Java #BarcodeScanner #EnterpriseDev #DevBlog

Java Evolved: 112 modern patterns · Java 8 → Java 25 TIL: You don't need to create an object within try-with block, but can just do `try(var) {}` and var will be closed after. Should probably take a closer look a the other 111 patterns. https://lnkd.in/es6Rhu46

Over the last few months, I've been building applications with Java after 10 years of using C# and the .NET platform. And what I've found is a language far more modern than I remembered from college and past experiences. If you haven't kept up with the news since Java 8, you need to see Java Evolved, a project spearheaded by Bruno Borges (https://lnkd.in/dvyayNiU) It acts as a visual reference guide, showing the "before" and "after" of Java code. No theory, just practice. 🔹 From: Verbose classes ➡️ To: Concise Records. 🔹 From: Error-prone switch statements ➡️ To: Safe Switch Expressions. 🔹 From: Manual casts with instanceof ➡️ To: Smart Pattern Matching. Coming from C#, it feels familiar. It's Java embracing patterns that prioritize clarity and safety, without sacrificing the robustness of its ecosystem. It's a great tool to get up to speed, guide a code review, or simply rediscover the elegance of modern Java. Check it out, and maybe even contribute. ➡️ https://lnkd.in/dBUcppBt #Java #CSharp #DotNet #SoftwareDevelopment #CleanCode #OpenSource #Developer

📘 Core Java | Day 36 | What Is Try-With-Resources and Why Is It Important? In Java, many objects like files, database connections, streams, and sockets use system resources. - If these resources are not closed properly, they can cause memory leaks and performance issues. To solve this problem, Java introduced Try-With-Resources. What Is Try-With-Resources? - Try-With-Resources is a special form of try block that automatically closes resources after execution. - It was introduced in Java 7. - Java takes responsibility for closing resources, even if an exception occurs. How It Works - Resources are declared inside the try statement - The resource must implement AutoCloseable - Java automatically calls close() at the end What If an Exception Occurs? - If an exception occurs in try And another exception occurs while closing the resource - The closing exception is suppressed, not lost - Java preserves the original exception, which helps debugging.

📌 Comparable<T> vs Comparator<T> in Java — Know the Real Difference In Java, both Comparable and Comparator are functional interfaces used for object sorting — but they serve different purposes. 🔹 Comparable<T> Belongs to java.lang package Defines natural (default) sorting order Contains compareTo(T obj) method Sorting logic is written inside the same class Supports only one sorting sequence Used with: Arrays.sort(T obj[]) Collections.sort(List<E> list) 🔹 Comparator<T> Belongs to java.util package Defines custom sorting order Contains compare(T o1, T o2) method No need to modify the original class Supports multiple sorting sequences Used with: Arrays.sort(T obj[], Comparator<T> cmp) Collections.sort(List<E> list, Comparator<T> cmp) ==> Key Takeaway: Use Comparable when you want a single, natural ordering of objects. Use Comparator when you need flexible, multiple, or user-defined sorting logic. Understanding this difference is crucial for writing clean, scalable, and maintainable Java code. #Java #CoreJava #CollectionsFramework #Comparable #Comparator #JavaDeveloper #BackendDevelopment #Programming

🚀 365-Day Java Challenge – Day 280 🚀 ⸻ 🔹 Day 280: Default Methods in Interfaces Which statement about default methods in a Java interface is TRUE? Options: A) A class implementing the interface must override every default method. B) Default methods can access instance fields of the implementing class directly. C) An interface can have both default and static methods. D) A default method can be declared abstract.

Java 9 – Private Methods in Interface We explored one of the most underrated Java 9 features: ✔ Interfaces can now have private methods ✔ Used for internal code reuse ✔ Accessible only inside the interface ✔ Supports clean default & static method logic Example insight: default → inherited by implementing class static → called using Interface name private → only for internal interface use This improves encapsulation inside interfaces 🔥 Abstract Class in Java (With Simple Example) 📌 What is an Abstract Class? An abstract class is a class that: ✅ Cannot be instantiated (no object creation directly) ✅ Can contain abstract methods (methods without body) ✅ Can contain normal methods (methods with body) ✅ Is used when you want common structure + compulsory implementation 🧠 Why Use Abstract Class? Use it when: Multiple classes share common properties But each class has different implementation logic

🔹 Pass by Value vs Pass by Reference in Java • In Java, everything is Pass by Value. • For primitive types (int, double, char, etc.), Java sends a copy of the actual value. • Any changes inside the method will NOT affect the original variable. • For objects, Java sends a copy of the reference (memory address). • Both original reference and method reference point to the same object in heap memory. • If you modify the object’s data inside the method, the change is reflected outside the method. • If you assign a new object inside the method, the original reference will NOT change. 🧠 Easy Recall Trick Primitive → Copy of Value → No Change Object → Copy of Address → Object Data Can Change #TapAcademy Java #CoreJava #ProgrammingConcepts #PassByValue #InterviewPreparation #JavaDeveloper #WomenInTech #LearningJourney

Most Java devs use wrapper classes every day without thinking twice. But once you look closer, the amount of hidden behavior they control becomes almost impossible to ignore. If you’ve ever felt like there’s more going on beneath a simple Integer or Double, this article will pull that thread. https://bit.ly/4augIRk