Switch statement in Java - Mini Project: Build & Apply

Using Switch Statement in Java

📖 Scenario: You are creating a simple program that tells the day of the week based on a number input from 1 to 7.This is like a small calendar helper that converts numbers to day names.

🎯 Goal: Build a Java program that uses a switch statement to print the correct day name for a given number.

📋 What You'll Learn

Create an integer variable called dayNumber with a value from 1 to 7

Create a switch statement using dayNumber

Use case labels for numbers 1 to 7 to print the correct day name

Include a default case to print "Invalid day number" for other values

Print the day name or error message as the final output

💡 Why This Matters

🌍 Real World

Switch statements are used in many programs to choose actions based on user input or other values, like menus or commands.

💼 Career

Understanding switch statements helps you write clear and efficient code for decision-making in software development.

1

Create the day number variable

Create an integer variable called dayNumber and set it to 3.

Java

# Your code here

Need a hint?

Use int dayNumber = 3; to create the variable.

2

Start the switch statement

Write a switch statement using the variable dayNumber.

Java

int dayNumber = 3;
// Start a switch statement with dayNumber
# Your code here

Need a hint?

Use switch (dayNumber) { } to start the switch.

3

Add cases for days 1 to 7 and default

Inside the switch, add case labels for numbers 1 to 7. For each case, write System.out.println to print the correct day name: 1 for "Monday", 2 for "Tuesday", 3 for "Wednesday", 4 for "Thursday", 5 for "Friday", 6 for "Saturday", and 7 for "Sunday". Add a default case that prints "Invalid day number". Use break; after each case.

Java

int dayNumber = 3;
switch (dayNumber) {
    // Add cases 1 to 7 and default
# Your code here
}

Need a hint?

Remember to use break; after each case to stop fall-through.

4

Run and print the output

Run the program and observe the output printed by the switch statement for dayNumber = 3. It should print "Wednesday".

Java

int dayNumber = 3;
switch (dayNumber) {
    case 1:
        System.out.println("Monday");
        break;
    case 2:
        System.out.println("Tuesday");
        break;
    case 3:
        System.out.println("Wednesday");
        break;
    case 4:
        System.out.println("Thursday");
        break;
    case 5:
        System.out.println("Friday");
        break;
    case 6:
        System.out.println("Saturday");
        break;
    case 7:
        System.out.println("Sunday");
        break;
    default:
        System.out.println("Invalid day number");
        break;
}
// Run the program to see the output

Need a hint?

The output should be exactly "Wednesday" because dayNumber is 3.