Salesforce Platform Developer I (legacy) — Question 242

How should a developer create a new custom exception class?

Answer options

• A. public class CustomException extends Exception{}
• B. CustomException ex = new (CustomException)Exception();
• C. public class CustomException implements Exception{}
• D. (Exception)CustomException ex = new Exception();

Correct answer: A

Explanation

The correct answer is A because it correctly extends the Exception class, allowing CustomException to inherit its properties and behaviors. Option B is incorrect as it has a syntax error and does not properly instantiate a custom exception. Option C is wrong because exceptions in Java do not implement interfaces but rather extend from the Exception class. Option D is incorrect due to improper casting and instantiation of an Exception instance instead of a CustomException.