Create packages, import packaged classes and interfaces into your programs, move packages, and encapsulate them in jar files.

Use Java's packages and static imports to organize top-level types and simplify access to their static members.

In Java, a package can contain other packages, classes, or both. When modeling, you’ll typically have logical packages that serve primarily to organize your model.

Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.