How to Create User Defined Exception in Java | Interview Question | Ashok IT
🚨 Java User Defined Exception (Custom Exception) – Explained Clearly
Java provides many built-in exceptions, but in real-time applications, we often need custom rules and validations.
That’s where User Defined Exceptions (Custom Exceptions) come into play.
In this video by Ashok IT, you’ll learn how to create and use your own exception in Java, with simple examples, real-time use cases, and interview tips.
This topic is frequently asked in Java interviews for freshers and experienced developers.
🔥 What You’ll Learn in This Video
🔹 1. What is a User Defined Exception?
✔️ Why built-in exceptions are not enough
✔️ When to create a custom exception
✔️ Real-time scenarios (age validation, balance check, login rules)
🔹 2. Types of Custom Exceptions
✔️ Checked Exception (extends Exception)
✔️ Unchecked Exception (extends RuntimeException)
🔹 3. Creating a User Defined Exception (Example)
class InvalidAgeException extends Exception {
public InvalidAgeException(String message) {
super(message);
}
}
🔹 4. Using Custom Exception
class Test {
static void validateAge(int age) throws InvalidAgeException {
if(age 18) {
throw new InvalidAgeException("Age must be 18 or above");
}
System.out.println("Valid age");
}
public static void main(String[] args) throws InvalidAgeException {
validateAge(16);
}
}
🔹 5. Unchecked Custom Exception Example
class InsufficientBalanceException extends RuntimeException {
public InsufficientBalanceException(String message) {
super(message);
}
}
🔹 6. Interview Focus Points
✔️ Difference between Checked & Unchecked custom exceptions
✔️ When to extend Exception vs RuntimeException
✔️ Best practices for naming exceptions
✔️ Real-time project usage
🧑💻 Who Should Watch This Video?
🔹 Java Beginners
🔹 Full Stack Java Learners
🔹 Backend Developers
🔹 Interview Preparation Candidates
🔹 Anyone learning Java Exception Handling
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