VTU 3rd Sem OOP with Java | User Defined Exception Program | BCS306A Module 4

Welcome to Express VTU 4 All 🎓
In this video, we cover an IMPORTANT 7+7 MARKS QUESTION from
📘 Object Oriented Programming with Java
📘 Subject Code: BCS306A
📌 Module-04
🎓 VTU 3rd Semester (CBCS Scheme)
This question is frequently asked in VTU external exams.
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🔥 Question Covered
Q. How do you create your own exception class? Explain with a program.
📘 Theory Explanation (Exam Writing Format)
✅ What is User-Defined Exception?
In Java, we can create our own exception by extending the Exception class.
✅ Steps to Create Custom Exception:
1️⃣ Create a class that extends Exception
2️⃣ Define a constructor
3️⃣ Use throw keyword to throw exception
4️⃣ Handle it using try-catch block
💻 Java Program
Java
Copy code
// Step 1: Create custom exception
class MyException extends Exception {
MyException(String msg) {
super(msg);
}
}

public class CustomExceptionDemo {
public static void main(String[] args) {

try {
int age = 15;

if (age smaller than18) {
throw new MyException("Not Eligible to Vote");
}

System.out.println("Eligible to Vote");

} catch (MyException e) {
System.out.println("Exception Caught: " + e.getMessage());
}
}
}
🖥 Output
Copy code

Exception Caught: Not Eligible to Vote
🧠 Important Keywords (Write in Exam)
✔ extends Exception
✔ super() method
✔ throw keyword
✔ try-catch block
✔ getMessage()
🎯 Viva Questions
🔹 Difference between throw and throws?
🔹 What is checked exception?
🔹 Why do we use super(msg)?
🔹 Can we create multiple constructors?
📚 Subject Information
📘 Subject: Object Oriented Programming with Java
📘 Code: BCS306A
📘 Module: 04
🎓 VTU 3rd Semester

VTU 3rd Sem Java
BCS306A Module 4
User Defined Exception VTU
Custom Exception Java
VTU OOP Important Questions
Exception Handling Java VTU
VTU CBCS 3rd Sem OOP
How do you create your own exception class? Explain with a program.
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#BCS306A
#VTU3rdSem
#OOPwithJava
#ExceptionHandling
#CustomException
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