#81 Custom Exception in Java
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In this lecture we are discussing about custom Exception:
--Java provides a set of built-in exceptions that cover most of the common error scenarios in a program.
--there may be cases where we need to define our own exception class to represent an error specific to your program.
#1
How to create custom exception in java?
class MyException extends Exception{
// this class is own exception class defined by according to our need
}
-- MyException is a custom exception class that extends the Exception class.
#2
Now we want to pass some message
-- we need a constructor that takes a String message, which is passed to the parent constructor using the super keyword.
e.g -
public class MyException extends Exception {
public MyException(String message) {
super(message);
}
}
Note: we can add additional properties and methods to your custom exception class as needed, just like you would with any other Java class.
#3
As per need we can throw custom Exception
e.g
public class Main{
public static void main(String []args){
try{
throw new NavinException("This is my exception");
}catch(NavinException e){
System.out.println(e.getMessage());
}
}
}
class NavinException extends Exception{
public NavinException(String s) {
super(s);
}
}
Important Notes:
-- we can create a custom exception by extending the Throwable class in Java
-- we can create a custom exception by extending the Exception class in Java
-- we can create a custom exception by extending the Exception class or one of its subclasses, such as RuntimeException.
Recommended:
-- Generally recommended to create custom exceptions by extending the Exception class or one of its subclasses, such as RuntimeException.
This makes it easier to handle your exception in a specific way and ensures that it behaves like other exceptions in the Java platform.
-- it is not recommended create custom exception using Throwable, the Throwable class is typically used to create other types of exceptions,
such as errors and checked exceptions, rather than custom exceptions.
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