Day 4️⃣ – Java Program Structure & Syntax Explained | Variables, Keywords & Comments | Learn Java

🚀 Welcome to Day 4 of Java Full Course in Hindi!
Aaj hum samjhenge Java Program Structure aur Syntax, jisme aapko milega Java code likhne ka foundation — line by line explanation ke sath 🔥
Is video me aap seekhoge 👇
If you’ve ever been confused about which data type to use in Java — this video will clear everything once and for all!
✅ Java Program ka basic structure (class, main method, output statement)
✅ Java Comments ka use (Single-line & Multi-line)
✅ Identifiers aur Keywords ka meaning
✅ Variables aur Data Types ka short intro
✅ Important Java Syntax Rules & Naming Conventions
🧩 Part 1 – Java Program Structure
🗒️ Part 2 – Comments in Java :-
a. // This is a single-line comment
b. /* This is a multi-line comment */

🔠 Part 3 – Identifiers & Keywords:-
a. Identifiers — names hum dete hain variables, classes, methods ko.
Example: age, MyClass, showData()

b. Keywords — reserved words jinka special meaning hota hai.
Example: class, public, static, void, int

🔢 Part 4 – Variables & Data Types (Intro):-
Example:- int age = 20;
String name = "Rehan";
float marks = 88.5f;

📏 Part 5 – Syntax Rules & Conventions:-
a. Har statement ke end me semicolon (;) lagta hai.

b. Java case-sensitive hai.

c. Class name capital letter se start hona chahiye.

d. Variable names camelCase me likhe jaate hain — jaise studentName, totalMarks




🧠 Part 6 – Practice Tasks:-
1. Ek program likho jo aapka name aur age print kare.

2. Code me comments likhkar explain karo.

3. Ek galat variable name try karo aur dekho compiler kya error deta hai.
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