Run Java single-file-source code with dependency and external library

Question

I would like to know how to use the command line to run the Java single-file-source code.

I know that I cannot refer to outside classes per rules.

But I saw an YouTube video. The author is able to use external JAR library when he runs single-file-source code.

See this YouTube video @ 6:00 minute https://www.youtube.com/watch?v=U7Rp9hq0_Zk

He types:

java -cp mysql-connector-java-8.0.19.jar Database.java

I don't know how the database really works. I'm not there yet.

But if you guys can show me a quick example, that would be great.

Thanks!