Скачать или смотреть Java Exception Handling | Authentication System Example

In this beginner-friendly Java tutorial, we build a simple Login System using Custom Exceptions. You’ll learn how to create your own exception class, how to throw exceptions manually, and how to use try-catch blocks to handle invalid login attempts.

Custom exceptions are widely used in real applications—like login pages, form validations, banking apps, and input verification. This tutorial explains the concept step by step so you can easily apply it in your college practicals, viva, and Java projects.

We walk through everything from creating a custom exception class to writing a clean login validation logic with helpful error messages. By the end, you’ll have a complete understanding of how custom exceptions work and when to use them.

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