🚀 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.