Try–catch block in Java - Mini Project: Build & Apply

Handling Errors with Try-Catch Block in Java

📖 Scenario: Imagine you are building a simple calculator app that divides two numbers. Sometimes users might enter zero as the divisor, which causes an error. You want to handle this error gracefully so the app doesn't crash.

🎯 Goal: Build a Java program that safely divides two numbers using a try-catch block to handle division by zero errors.

📋 What You'll Learn

Create two integer variables named numerator and denominator with values 10 and 0 respectively.

Create a variable named result of type int to store the division result.

Use a try block to perform the division numerator / denominator and assign it to result.

Use a catch block to catch ArithmeticException and print "Cannot divide by zero!".

Print the value of result after the try-catch block.

💡 Why This Matters

🌍 Real World

Try-catch blocks are used in real apps to prevent crashes when unexpected errors happen, like dividing by zero or reading files that don't exist.

💼 Career

Understanding error handling is important for writing reliable software and is a common skill required in programming jobs.

1

Create variables for division

Create two integer variables called numerator and denominator with values 10 and 0 respectively.

Java

# Your code here

Need a hint?

Use int numerator = 10; and int denominator = 0; to create the variables.

2

Create a variable to store the result

Create an integer variable called result and initialize it to 0.

Java

int numerator = 10;
int denominator = 0;
# Your code here

Need a hint?

Use int result = 0; to create the variable.

3

Use try-catch to handle division

Write a try block that divides numerator by denominator and assigns it to result. Then write a catch block that catches ArithmeticException and prints "Cannot divide by zero!".

Java

int numerator = 10;
int denominator = 0;
int result = 0;
# Your code here

Need a hint?

Use try { result = numerator / denominator; } and catch (ArithmeticException e) { System.out.println("Cannot divide by zero!"); }.

4

Print the result

Write a System.out.println statement to print the value of result.

Java

int numerator = 10;
int denominator = 0;
int result = 0;

try {
    result = numerator / denominator;
} catch (ArithmeticException e) {
    System.out.println("Cannot divide by zero!");
}
# Your code here

Need a hint?

Use System.out.println(result); to print the result.