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.

Why is it recommended to use a variable instead of hardcoding values in an API?

• It makes the code more readable.

• It allows for easier updates and maintenance.

• It improves the performance of the API.

• It reduces the size of the code.

What is the purpose of mapping a path variable to an ID in a course details API?

• To allow dynamic retrieval of course details.

• To improve the speed of the API.

• To reduce the number of lines of code.

• To ensure the API is secure.

What data type should be used instead of 'int' for handling course IDs in the API?

• Float

• String

• Double

• Long

How does the API handle cases where a course with a specific ID does not exist?

• It returns a default course.

• It throws a runtime exception.

• It logs an error message.

• It retries the request.

What is the role of the 'optional' class in the course details API?

• To simplify the code structure.

• To handle cases where a course might not exist.

• To reduce the memory usage of the API.

• To improve the performance of the API.