🚀 Day 21 of My Automation Journey – If / Else Tricky Questions

Today I explored some tricky and confusing scenarios in Java if / else statements.

At first, if-else looks simple… but small mistakes in syntax, conditions, or indentation can completely change the output 😲

So I practiced 12 tricky questions to understand how Java actually executes them.

🔹 What is if Statement?

✔ Executes code only when condition is true

🔍 Scenario 1

int x = 5;

if (x > 2)
    System.out.println("Hello");

✅ Explanation
5 > 2 → true

📤 Output

Hello

🔍 Scenario 2

int x = 5;

if (x < 2)
    System.out.println("Hello");

System.out.println("Hi");

✅ Explanation

5 < 2 → false → if block skipped

But the second statement is outside if, so it executes.

📤 Output

Hi

🔍 Scenario 3

if(true)
{
    System.out.println("Hello");
}

✅ Explanation

Condition is always true

📤 Output

Hello

🔍 Scenario 4

if(false)
{
    System.out.println("Hello");
}

✅ Explanation

Condition is always false

📤 Output

(No Output)

🔍 Scenario 5

int x = 5;

if (x > 2)
    System.out.println("Hello");
else
    System.out.println("Hi");

✅ Explanation
5 > 2 → true
📤 Output

Hello

🔍 Scenario 6 (Important ⚠️)

int x = 10;

if (x = 20) {
    System.out.println("True");
}

❌ Explanation
x = 20 → Assignment, NOT comparison
Java expects boolean condition, but x = 20 returns int.

📤 Result

Compile Time Error

👉 Correct way:

if (x == 20)

🔍 Scenario 7 (Dangling Else Problem)

int x = 5;

if (x > 2)
    if (x < 10)
        System.out.println("A");
    else
        System.out.println("B");

✅ Explanation
if (x > 2) → true
if (x < 10) → true

👉 else always attaches to the nearest if

📤 Output

A

🔍 Scenario 8

int a = 0;

if (a)
    System.out.println("Yes");
else
    System.out.println("No");

❌ Explanation

`Java does NOT allow:

if(a)

Condition must be boolean`

📤 Result

Compile Time Error

🔍 Scenario 9 (Very Important 🔥)

int x = 0;

if (x++ == 0 && ++x == 2)
    System.out.println("True");

System.out.println(x);

✅ Explanation

`Step by step:

x = 0

x++ == 0 → true (x becomes 1)
++x == 2 → x becomes 2 → true

Both conditions true → print "True"`

📤 Output

True
2

🔍 Scenario 10 (Short Circuit OR)

int x = 10;

if (x == 10 || x++ == 11)
    System.out.println(x);

✅ Explanation
`x == 10 → true

👉 OR (||) stops execution if first condition is true
👉 x++ is NOT executed`

📤 Output

10

🔍 Scenario 11 (Common Mistake ⚠️)

int x = 5;

if (x > 2)
    System.out.println("A");
    System.out.println("B");

✅ Explanation
Only first line is part of if
Second line always executes
📤 Output

A
B

🔍 Scenario 12 (Nested if)

int x = 10, y = 5;

if (x > y)
    if (y > 0)
        if (x > 20)
            System.out.println("A");
        else
            System.out.println("B");

✅ Explanation
x > y → true
y > 0 → true
x > 20 → false

So else executes.

📤 Output

B

🧠 Key Takeaways

✔ if works only with boolean conditions
✔ = is assignment, == is comparison
✔ else always binds to nearest if
✔ Without {}, only one statement belongs to if
✔ Short-circuit operators (&&, ||) can skip execution
✔ Increment operators (++) change values during evaluation

🏁 Conclusion

Today’s session helped me understand how small syntax differences can completely change program behaviour.

These tricky questions are very useful for:

✔ Java interviews
✔ Writing correct automation logic
✔ Debugging real-world code

Step by step, I’m becoming more confident in Java fundamentals for automation testing 🚀

🤖 A Small Note

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