🚀 Day 24 of My Automation Journey – Looping Statements (While Loop)

Today I explored Looping Statements in Java, especially the while loop.

Loops are very important because they help us repeat a task multiple times without writing duplicate code.

🔹 What is a Loop?

👉 A loop is used to execute a block of code repeatedly based on a condition.

🔁 Types of Loops in Java

✔ While Loop

✔ For Loop

✔ Do-While Loop

👉 Today focus: While Loop

🔹 While Loop Syntax

while(condition) {

    // code

}

✔ Condition is checked first

✔ If true → executes

✔ If false → stops

🔍 Scenario 1: Print same number multiple times

❓ Question

Print 1 five times

int i = 1;



while(i <= 5) {

    System.out.print(1 + " ");

    i++;

}

📤 Output

1 1 1 1 1

✅ Explanation

✔ Loop runs 5 times

✔ Always prints 1

🔍 Scenario 2: Print numbers from 1 to 5

❓ Question

Print numbers from 1 to 5

int i = 1;



while(i <= 5) {

    System.out.print(i + " ");

    i++;

}

📤 Output

1 2 3 4 5

✅ Explanation

✔ i increases each time

✔ Prints updated value

🔍 Scenario 3: Print odd numbers

❓ Question

Print odd numbers from 1 to 10

int i = 1;



while(i <= 10) {

    if(i % 2 != 0) {

        System.out.print(i + " ");

    }

    i++;

}

📤 Output

1 3 5 7 9

✅ Explanation

✔ i % 2 != 0 → odd numbers

✔ Even numbers skipped

🔍 Scenario 4: Multiplication Table (×5)

❓ Question

Print multiplication table of 5

int i = 1;



while(i <= 5) {

    System.out.println(i + " * 5 = " + i * 5);

    i++;

}

📤 Output

1 * 5 = 5

2 * 5 = 10

3 * 5 = 15

4 * 5 = 20

5 * 5 = 25

✅ Explanation

✔ Loop runs 5 times

✔ Multiplies i * 5

🔍 Scenario 5: Multiples of 3 AND 5

❓ Question

Print numbers divisible by both 3 and 5

int i = 1;



while (i <= 30) {

    if (i % 3 == 0 && i % 5 == 0)

        System.out.println(i);

    i++;

}

📤 Output

15

30

✅ Explanation

✔ && → both conditions must be true

✔ Only multiples of 15 printed

🔍 Scenario 6: Multiples of 3 OR 5

❓ Question

Print numbers divisible by 3 OR 5

int i = 1;



while (i <= 10) {

    if (i % 3 == 0 || i % 5 == 0)

        System.out.println(i);

    i++;

}

📤 Output

3

5

6

9

10

✅ Explanation

✔ || → any one condition true

✔ More numbers printed

🔍 Scenario 7: Multiple Conditions with if-else

❓ Question

Print different messages based on divisibility

int i = 1;



while (i <= 20) {



    if (i % 3 == 0 && i % 5 == 0)

        System.out.println(i + " multiply by both");



    else if (i % 3 == 0)

        System.out.println(i + " multiply by 3");



    else if (i % 5 == 0)

        System.out.println(i + " multiply by 5");



    else

        System.out.println(i);



    i++;

}

📤 Output (Sample)

8

9 multiply by 3

10 multiply by 5

11

12 multiply by 3

13

14

15 multiply by both

16

17

18 multiply by 3

✅ Explanation

✔ Priority matters

✔ First matching condition executes

⚠️ Common Mistakes

❌ Forgetting i++ → Infinite loop 😱

❌ Wrong condition → loop never runs

❌ Using = instead of ==

🧠 Key Takeaways

✔ While loop checks condition first

✔ Used when number of iterations is unknown

✔ i++ is very important

✔ && → both conditions

✔ || → any one condition

✔ Can combine with if-else for complex logic

🏁 Conclusion

Today I learned how to use while loop effectively with conditions.

This is very useful in automation for:

✔ Repeating test steps

✔ Data-driven testing

✔ Iterating through elements

Step by step, I’m improving my Java logic for Selenium Automation 🚀

🤖 A Small Note

I used ChatGPT to help structure and refine this blog while ensuring the concepts remain aligned with my trainer’s explanations.