Add a description, image, and links to the user-defined-exception topic page so that developers can more easily learn about it.

In the day 5 I have learn about the EXCEPTION HANDLING and made programs based on problems { Handling the exception using try-catch block, Handling a NullPointerException, Writing data to a text file ...

Even though exception handling is common and every introductory Java course covers it, I still don't think we really know how to do it well. It is almost as if the general concept is still evolving ...