Access Modifiers
It's important to know the information in this section, but you can skim through it on the first reading. It explains how we can use keywords to make things more widely or narrowly visible.
There are three or four keywords that are applied to class members. These keywords are collectively called the access modifiers. By default, a member is only visible to classes in its own package. Certain keywords make them visible inside the class (only), or inside the inheritance hierarchy, or to classes in other packages.
Access modifiers for a class
Class declarations can be nested inside other classes. It's a design choice you'd make when the nested class is a helper or utility for the top level class. E.g. the top level class ...
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