Skip to content

Latest commit

 

History

History

01basic

Folders and files

NameName
Last commit message
Last commit date

parent directory

..
challenges
challenges
 
 
HelloWorld.java
HelloWorld.java
 
 
MultiLinePrint.java
MultiLinePrint.java
 
 
readme.md
readme.md
 
 

readme.md

☕ Java Lesson 1 – Hello World & Printing Output

Is lesson me hum Java ka sabse basic program (Hello World) aur console par single line aur multi line printing seekhenge.

Java me har program class ke andar likha jata hai aur execution main() method se start hota hai.

1️⃣ Hello World Program

Hello World program programming ka sabse pehla aur simplest program hota hai jo sirf ek message print karta hai.

📌 Example Code

public class HelloWorld {

    public static void main(String[] args) {

        System.out.println("Hello World");

    }

}

🧠 Explanation

Code Meaning
public Access modifier (sab jagah se accessible)
class Java me program class ke andar likha jata hai
HelloWorld Class ka naam
main() Program ka entry point
System.out.println() Console par text print karta hai

▶ Output

Hello World

2️⃣ Single Line Printing

Single line printing ka matlab hai ek hi line me output print karna.

Java me hum System.out.print() ka use karte hain.

📌 Example Code

public class SingleLinePrint {

    public static void main(String[] args) {

        System.out.print("Hello ");
        System.out.print("Sujit");

    }

}

▶ Output

Hello Sujit

🔎 Important:
print() new line create nahi karta.

3️⃣ Multi Line Printing

Multi line printing ka matlab hai har output next line me print hona.

Iske liye println() method use hota hai.

📌 Example Code

public class MultiLinePrint {

    public static void main(String[] args) {

        System.out.println("Sujit");
        System.out.println("Kumar");
        System.out.println("Singh");

    }

}

▶ Output

Sujit
Kumar
Singh

🔎 Important:
println() automatically new line create karta hai.

4️⃣ Difference Between print() and println()

Method Work
print() Same line me output print karta hai
println() Output print karke next line me chala jata hai

📌 Example Code

public class PrintExample {

    public static void main(String[] args) {

        System.out.print("Java ");
        System.out.print("Programming");

        System.out.println();

        System.out.println("Java");
        System.out.println("Programming");

    }

}

▶ Output

Java Programming
Java
Programming

5️⃣ Java Program Structure

Ek basic Java program ka structure kuch is tarah hota hai:

Class
 └── main() Method
       └── Statements

📌 Example Structure Code

public class ProgramName {

    public static void main(String[] args) {

        // Program statements yaha likhe jate hain

    }

}

⚡ Important Points

  • Java ek object oriented programming language hai.
  • Har Java program class ke andar likha jata hai.
  • Program execution main() method se start hota hai.
  • System.out.println() console par output print karta hai.
  • print() same line me print karta hai.
  • println() new line create karta hai.

🎯 Interview Questions

1️⃣ Java program ka entry point kya hota hai?
2️⃣ System.out.println() kya karta hai?
3️⃣ print() aur println() me kya difference hai?
4️⃣ Java program ka basic structure kya hota hai?

🧾 Lesson Summary

Is lesson me humne seekha:

✔ Hello World program
✔ Java program ka basic structure
✔ Single line printing
✔ Multi line printing
✔ print() vs println() difference

Ye Java programming ka foundation lesson hai.

🚀 Next Lesson

Next lesson me hum seekhenge:

  • Variables
  • Data Types
  • Naming Rules
  • Memory Basics