Packages can store classes and interfaces, as well as subpackages, which are packages nested within other packages. A package has a name, which must be a non-reserved identifier; for example, java.

In Java, nested classes are categorized as either static member classes or inner classes. Inner classes are non-static member classes, local classes, or anonymous classes.

Final means the variable can't change. That's why global constants in Java use the static and final keywords. Example of static and final in Java Here's a static final example to further demonstrate ...