Java Programming for Complete Beginners - Java 16 - Step 07 - Building REST API to Retrieve Details of a Course – GET

The video tutorial explains how to create a simple API to retrieve course details by ID. It covers setting up a path variable, implementing a method to find courses by ID, handling errors and exceptions for non-existent courses, and finalizing the API. The tutorial emphasizes the importance of using variables instead of hardcoding values and demonstrates how to handle optional return types in Java.

Describe the process of extracting a local variable in the context of the API.

What happens when an invalid course ID is provided to the API?