Learn Java from Scratch - A Beginner's Guide - Step 07 - Building REST API to Retrieve Details of a Course – GET

The video tutorial explains how to create a simple API to get course details by ID. It covers the importance of using variables instead of hardcoded values, refactoring code to handle errors, and using Optional to manage potential null values. The tutorial also demonstrates how to return course details or throw exceptions if a course is not found.

Why is it recommended to use a variable instead of a hardcoded value when retrieving course details?

• Variables allow for dynamic input.

• Hardcoded values are faster.

• Hardcoded values are more secure.

• Variables are easier to read.

What is the purpose of extracting a local variable in the context of this API?

• To increase execution speed.

• To improve code readability.

• To enhance security.

• To reduce memory usage.

Why was the data type changed from int to long in the API?

• To handle larger numbers.

• To simplify the code.

• To improve performance.

• To reduce memory usage.

What does the 'optional' return type signify in the context of this API?

• The course is available only sometimes.

• The course is never available.

• The course may or may not be available.

• The course is always available.

What happens if a course with the specified ID is not found?

• The API returns null.

• The API throws a runtime exception.

• The API returns a default course.

• The API retries the request.