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DoWhileLoop.java
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forLoop.java
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readme.md

☕ Java Lesson – Loops, Nested Loops, Pattern Printing, Break & Continue

Is lesson me hum seekhenge:

  • Loops kya hote hain
  • Java me loops ke types
  • Nested loops
  • Pattern printing
  • Break statement
  • Continue statement

📌 Loop Kya Hota Hai?

Loop ek control structure hai jo kisi code ko multiple times execute karne ke liye use hota hai.

Example:

Agar hume 1 se 100 tak number print karna ho

Without loop:

System.out.println(1);
System.out.println(2);
System.out.println(3);
...

Loop use karne se code short aur efficient ho jata hai.

📌 Java me Loops ke Types

Java me 3 types ke loops hote hain:

Loops
│
├── for loop
├── while loop
└── do-while loop

1️⃣ for Loop

for loop tab use hota hai jab iterations ka exact number pata ho.

Syntax

for(initialization; condition; update){
    // code
}

Example

public class ForLoopExample {

    public static void main(String[] args) {

        for(int i = 1; i <= 5; i++){
            System.out.println(i);
        }

    }

}

Output:

1
2
3
4
5

2️⃣ while Loop

while loop tab use hota hai jab iterations ka number fix na ho.

Syntax

while(condition){
   // code
}

Example

public class WhileLoopExample {

    public static void main(String[] args) {

        int i = 1;

        while(i <= 5){
            System.out.println(i);
            i++;
        }

    }

}

3️⃣ do-while Loop

Is loop me code kam se kam ek baar execute hota hi hota hai.

Syntax

do{
   // code
}
while(condition);

Example

public class DoWhileExample {

    public static void main(String[] args) {

        int i = 1;

        do{
            System.out.println(i);
            i++;
        }
        while(i <= 5);

    }

}

📌 Nested Loops

Jab ek loop ke andar dusra loop hota hai use Nested Loop kehte hain.

Example structure:

Outer Loop
   └── Inner Loop

Syntax

for(){
    for(){
        // code
    }
}

Example – Nested Loop

public class NestedLoopExample {

    public static void main(String[] args) {

        for(int i = 1; i <= 3; i++){

            for(int j = 1; j <= 3; j++){
                System.out.print("* ");
            }

            System.out.println();
        }

    }

}

Output:

* * *
* * *
* * *

⭐ Pattern Printing

Pattern printing me nested loops use hote hain.

Pattern 1 – Square Pattern

public class SquarePattern {

    public static void main(String[] args) {

        for(int i = 1; i <= 4; i++){

            for(int j = 1; j <= 4; j++){
                System.out.print("* ");
            }

            System.out.println();
        }

    }

}

Output:

* * * *
* * * *
* * * *
* * * *

Pattern 2 – Right Triangle

public class TrianglePattern {

    public static void main(String[] args) {

        for(int i = 1; i <= 5; i++){

            for(int j = 1; j <= i; j++){
                System.out.print("* ");
            }

            System.out.println();
        }

    }

}

Output:

*
* *
* * *
* * * *
* * * * *

📌 Break Statement

break statement ka use loop ko immediately terminate karne ke liye hota hai.

Example

public class BreakExample {

    public static void main(String[] args) {

        for(int i = 1; i <= 10; i++){

            if(i == 5){
                break;
            }

            System.out.println(i);

        }

    }

}

Output:

1
2
3
4

Explanation:

Jab i = 5 hua
loop break ho gaya

📌 Continue Statement

continue statement current iteration ko skip karta hai aur next iteration start karta hai.

Example

public class ContinueExample {

    public static void main(String[] args) {

        for(int i = 1; i <= 5; i++){

            if(i == 3){
                continue;
            }

            System.out.println(i);

        }

    }

}

Output:

1
2
4
5

Explanation:

i = 3 skip ho gaya

📊 Break vs Continue

Statement Work
break loop ko completely stop karta hai
continue current iteration skip karta hai

⚡ Important Points

  • Loop repetitive tasks ke liye use hota hai
  • Nested loops pattern printing me use hote hain
  • break loop terminate karta hai
  • continue iteration skip karta hai
  • Pattern printing programming practice ke liye important hai

🎯 Interview Questions

1️⃣ Loop kya hota hai?
2️⃣ Java me kitne types ke loops hote hain?
3️⃣ Nested loop kya hota hai?
4️⃣ Break aur Continue me kya difference hai?
5️⃣ Pattern printing me nested loop kyu use hota hai?

🧾 Lesson Summary

Is lesson me humne seekha:

✔ Loops
✔ Nested loops
✔ Pattern printing
✔ Break statement
✔ Continue statement

Ye concepts DSA aur logic building ke liye bahut important hain.

🚀 Next Lesson

Next lesson me hum seekhenge:

  • Arrays
  • Array traversal
  • Multi dimensional arrays