Java Programming Lesson 1 | Introduction & Basics for Beginners

JAVA FULL COURSE — LESSON 1

✅ We officially begin your Java Full Course — Lesson 1 🚀

(Practical + Easy examples so you can start writing code now!)

📘 Lesson 1 — Introduction to Java + First Program

✅ What is Java?

Java is:

Feature	Meaning
Object-Oriented	Based on real-world objects
Platform Independent	“Write Once, Run Anywhere”
Secure	Used in banking, enterprise apps
Fast & Reliable	Used in Android, server apps

📌 Java programs run inside JVM (Java Virtual Machine), so they run on Windows, Linux, Mac, Android etc.

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✅ Install Tools (Setup)

You need:

Tool	Purpose	Download
JDK (Java Development Kit)	Compiler + JVM	https://www.oracle.com/java/technologies/javase-downloads.html
VS Code / IntelliJ IDEA	Code Editor	https://code.visualstudio.com/

If you want, I can guide installation with screenshots.

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✅ Your First Java Program

📌 File Name: HelloWorld.java

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}

▶ How to Run (From Command Line)

javac HelloWorld.java   // compile (creates HelloWorld.class)
java HelloWorld         // run

✅ Output:

Hello World!

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✅ Code Explained (Very Simple)

Code Part	Meaning
public class HelloWorld	Program name / class name
main()	Program start point
System.out.println()	Prints text to screen

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✅ Practice Task (Do it yourself)

Write a program that prints:

Welcome to Java Programming!
My name is YOUR NAME.

📌 Example (Replace "Your Name"):

public class Welcome {
    public static void main(String[] args) {
        System.out.println("Welcome to Java Programming!");
        System.out.println("My name is Your Name.");
    }
}

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✅ Mini Quiz (Answer in Chat)

1️⃣ The extension of Java source file is:
A) .class
B) .java
C) .exe

2️⃣ Java code runs inside the ______?
A) CPU
B) JVM
C) Browser

Reply with: 1 → ?, 2 → ?

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🎯 Lesson-1 Completed!

Shall we move to Lesson-2: Variables & Data Types after you answer the quiz?

Waiting for your answers 👇😊

▶ NEXT PART - Lesson-2: Variables & Data Types