Finally block in Java - Mini Project: Build & Apply

Using the Finally Block in Java

📖 Scenario: Imagine you are writing a simple Java program that reads a number from the user and divides 100 by that number. Sometimes the user might enter zero, which causes an error. You want to make sure that a message is always shown at the end, no matter what happens.

🎯 Goal: You will create a Java program that uses a try, catch, and finally block. The program will handle division by zero errors and always print a final message.

📋 What You'll Learn

Create an integer variable called number with the value 0

Create a try block that divides 100 by number

Create a catch block that catches ArithmeticException and prints "Cannot divide by zero"

Create a finally block that prints "End of program"

💡 Why This Matters

🌍 Real World

In real programs, you often need to handle errors like dividing by zero or missing files. The <code>finally</code> block helps you clean up or show messages no matter what happens.

💼 Career

Understanding <code>try</code>, <code>catch</code>, and <code>finally</code> blocks is important for writing reliable Java applications, which is a key skill for many programming jobs.

1

DATA SETUP: Create the variable number

Create an integer variable called number and set it to 0.

Java

// Create an integer variable called number and set it to 0
// Your code here

Need a hint?

Use int number = 0; to create the variable.

2

CONFIGURATION: Start the try block

Add a try block that will contain the division operation 100 / number.

Java

int number = 0;
// Start a try block below
// Your code here

Need a hint?

Write try { to start the block.

3

CORE LOGIC: Complete the try, catch, and finally blocks

Inside the try block, create an integer result that divides 100 by number. Then add a catch block for ArithmeticException that prints "Cannot divide by zero". Finally, add a finally block that prints "End of program".

Java

int number = 0;
try {
    // Divide 100 by number and store in result
    // Your code here
} catch (ArithmeticException e) {
    // Print "Cannot divide by zero"
    // Your code here
} finally {
    // Print "End of program"
    // Your code here
}

Need a hint?

Remember to put the division inside try, handle the exception in catch, and always print the final message in finally.

4

OUTPUT: Run the program and print the messages

Run the program so it prints the messages from the catch and finally blocks.

Java

int number = 0;
try {
    int result = 100 / number;
} catch (ArithmeticException e) {
    System.out.println("Cannot divide by zero");
} finally {
    System.out.println("End of program");
}
// Run the program to see output
// Your code here

Need a hint?

Make sure your program prints both messages exactly as shown.