Packaging section could use a little more discussion

A couple of students in the 2020 Java Launchcode session had issues with packages while doing the exercises and studios (e.g. they will put their code in package A.B.C.myCode in the folder structure, but their package line in their code says "package myCode;") I see very little of it mentioned in the courseware (right here: https://education.launchcode.org/java-web-development/chapters/data-types/exercises.html#creating-a-package-and-classes) - shouldn't there be a little bigger discussion on it?

Here is a discussion that is pretty good:

https://www.geeksforgeeks.org/packages-in-java/

从 issue 中链接的 courseware 页面开始，重点查看“Creating a Package and Classes”练习，并阅读所引用的 GeeksforGeeks 讨论，以获取有用的覆盖内容。扩展关于 packaging 的讨论，明确文件夹结构与 package 声明之间的关系，包括已报告的不匹配问题；完成的标准是该练习能够解决这一困惑。