Purpose#
Record the problems encountered and their solutions.
Error: Could not find or load main class Hello
Initially, I repeatedly closed and reopened VsCode, but the problem was not resolved. Refer to the solution at https://stackoverflow.com/questions/57857855/could-not-find-or-load-main-class-vs-code
The solution is to go to F1 -> Clean the java language server workspace.
So that's how you reload (tilts head back). I learned something.