🚀 Day 22 of My Automation Journey – Switch Case Statement in Java

Today I learned about another important decision-making concept in Java 👉 Switch Case Statement.

It is very useful when we need to compare one value against multiple options.

🔹 What is Switch Case?

A switch statement allows us to select one block of code from multiple choices.

👉 Instead of writing multiple if-else, we can use switch for better readability.

🧠 Syntax

switch(expression) {

    case value1:
        // code
        break;

    case value2:
        // code
        break;

    default:
        // default code
}

🔑 Important Points

✔ switch works with:

int
char
String
enum

❌ Not supported: float, double, boolean

🔸 What is break?

👉 break is used to stop execution of switch

Without break, Java will continue executing next cases (fall-through) ⚠️

🔸 What is continue?

👉 continue is NOT used inside switch directly

✔ It is used inside loops
✔ But can be used in switch only if switch is inside a loop

🔸 Switch Without Braces ❗

switch(day)
    case 1:
        System.out.println("Monday");

❌ This is INVALID in Java

👉 Curly braces {} are mandatory

💡 Scenario-Based Programs
🍽️ Scenario 1: Restaurant Menu Selection

`❓ Question

Select food using number:

1 → Idli
2 → Dosa
3 → Pongal
4 → Poori
`

private void scenario1() {

    int item = 3;

    switch (item) {

    case 1:
        System.out.println("Idli");
        break;

    case 2:
        System.out.println("Dosa");
        break;

    case 3:
        System.out.println("Pongal");
        break;

    case 4:
        System.out.println("Poori");
        break;

    default:
        System.out.println("Invalid Choice");
    }
}

📤 Output

Pongal

📅 Scenario 2: Day of the Week System
`❓ Question

1 → Monday
2 → Tuesday
…
7 → Sunday`

private void scenario2() {

    int day = 1;

    switch (day) {

    case 1:
        System.out.println("Sunday");
        break;

    case 2:
        System.out.println("Monday");
        break;

    case 3:
        System.out.println("Tuesday");
        break;

    case 4:
        System.out.println("Wednesday");
        break;

    case 5:
        System.out.println("Thursday");
        break;

    case 6:
        System.out.println("Friday");
        break;

    case 7:
        System.out.println("Saturday");
        break;

    default:
        System.out.println("Invalid Day");
    }
}

📤 Output

Sunday

📱 Scenario 3: Mobile Recharge Plan

`❓ Question

199 → 1GB/day
399 → 2GB/day
599 → 3GB/day`

private void scenario3() {

    int plan = 399;

    switch (plan) {

    case 199:
        System.out.println("1GB/day");
        break;

    case 399:
        System.out.println("2GB/day");
        break;

    case 599:
        System.out.println("3GB/day");
        break;

    default:
        System.out.println("Plan not available");
    }
}

📤 Output

2GB/day

🧑‍💼 Scenario 4: Employee Role Access
`❓ Question

ADMIN → Full access
MANAGER → Limited access
EMPLOYEE → Basic access`

private void scenario4() {

    String role = "ADMIN";

    switch (role) {

    case "ADMIN":
        System.out.println("Full Access");
        break;

    case "MANAGER":
        System.out.println("Limited Access");
        break;

    case "EMPLOYEE":
        System.out.println("Basic Access");
        break;

    default:
        System.out.println("No Access");
    }
}

📤 Output

Full Access

🚦 Scenario 5: Traffic Fine System
`❓ Question

1 → No helmet
2 → No seatbelt
3 → Signal jump
4 → Over speed`

private void scenario5() {

    int code = 2;

    switch (code) {

    case 1:
        System.out.println("No Helmet Fine");
        break;

    case 2:
        System.out.println("No Seatbelt Fine");
        break;

    case 3:
        System.out.println("Signal Jump Fine");
        break;

    case 4:
        System.out.println("Over Speed Fine");
        break;

    default:
        System.out.println("Invalid Violation");
    }
}

📤 Output

No Seatbelt Fine

⚠️ Important Concept: Fall Through

int x = 1;

switch(x) {
    case 1:
        System.out.println("A");
    case 2:
        System.out.println("B");
}

📤 Output

A
B

👉 Because break is missing

🧠 Key Takeaways

✔ Switch is cleaner than multiple if-else
✔ break prevents unwanted execution
✔ default works like else
✔ Works with int, char, String
✔ Curly braces {} are mandatory
✔ continue is not directly used in switch

🏁 Conclusion

Today I understood how to use switch-case effectively in Java.

This is very useful in automation for:

✔ Menu selection
✔ Handling multiple conditions
✔ Writing clean and readable code

Step by step, I’m improving my Java logic 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.