Module 16: Exception Handling

🚨 What is Exception Handling?

Exception Handling is a mechanism in Java used to handle runtime errors, allowing the program to continue its normal flow. It improves the program's robustness and user experience.

🧱 Types of Exceptions

• Checked Exceptions: Known at compile-time (e.g., IOException)
• Unchecked Exceptions: Known at runtime (e.g., ArithmeticException)

⚙️ try-catch Block

                    try {
                        int a = 10 / 0;
                    } catch (ArithmeticException e) {
                        System.out.println("Cannot divide by zero!");
                    }
                    

🔁 finally Block

The finally block always executes whether an exception occurs or not.

                    try {
                        String s = null;
                        System.out.println(s.length());
                    } catch (NullPointerException e) {
                        System.out.println("Null pointer exception");
                    } finally {
                        System.out.println("This block always runs");
                    }
                    

🎯 throw and throws Keywords

                    void checkAge(int age) throws Exception {
                        if (age < 18) {
                            throw new Exception("Not eligible to vote");
                        }
                    }