Master Java Programming

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HelloWorld.java

public class HelloWorld {
    public static void main(String[] args) {
        // Welcome to A Coder!
        System.out.println("Hello, Coder!");
        
        ACoder journey = new ACoder();
        journey.startLearning();
    }
}

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Java Fundamentals

Learn the basics of Java programming including variables, loops, conditions, and methods.

📚 24 Lessons

⏱️ 12 Hours

🎯

Object-Oriented Programming

Master OOP concepts: Classes, Objects, Inheritance, Polymorphism, and Encapsulation.

📚 32 Lessons

⏱️ 18 Hours

🔧

Data Structures & Algorithms

Deep dive into arrays, linked lists, trees, graphs, sorting, and searching algorithms.

📚 40 Lessons

⏱️ 25 Hours

🚀

Advanced Java

Explore multithreading, collections framework, streams, lambda expressions, and more.

📚 36 Lessons

⏱️ 20 Hours

🌐

Spring Framework

Build enterprise applications with Spring Boot, Spring MVC, and Spring Data JPA.

📚 28 Lessons

⏱️ 16 Hours

💾

Database & JDBC

Connect Java applications to databases using JDBC, SQL, and database best practices.

📚 20 Lessons

⏱️ 14 Hours

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Java Best Practices Every Developer Should Know

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Understanding OOP: A Complete Guide

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Advanced

⏱️ 15 min read Feb 5, 2026

Data Structures in Java: Arrays to Trees

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Try It Yourself

Interactive Java playground - write, run, and learn

✏️ Editor

public class Main {
    public static void main(String[] args) {
        System.out.println("Hello from A Coder!");
    }
}

📺 Output

Press "Run Code" to see the output...