Program 4.2

SaketJNU · SaketJNU · commit c93e454933e2 · 2025-05-28T14:25:42.000+05:30
diff --git a/ucer/4B4/4_2.java b/ucer/4B4/4_2.java
@@ -0,0 +1,41 @@
+import java.util.Scanner;
+
+// User-defined (custom) checked exception
+class InvalidAgeException extends Exception {
+    public InvalidAgeException(String message) {
+        super(message);
+    }
+}
+
+class CustomExceptionDemo {
+
+    // Method that throws the custom exception
+    public static void checkAge(int age) throws InvalidAgeException {
+        if (age < 18) {
+            throw new InvalidAgeException("Age must be 18 or older to register.");
+        } else {
+            System.out.println("Age is valid. You are eligible to register.");
+        }
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        try {
+            System.out.print("Enter your age: ");
+            int age = scanner.nextInt();
+
+            // Call method that may throw custom exception
+            checkAge(age);
+        } catch (InvalidAgeException e) {
+            System.out.println("Custom Exception Caught: " + e.getMessage());
+        } catch (Exception e) {
+            System.out.println("Unexpected error: " + e);
+        } finally {
+            // Cleanup or final message
+            System.out.println("Execution completed. Thank you!");
+            scanner.close();
+        }
+    }
+}
+
