SE450: Encapsulation: Encapsulation in Java [16/47]

Java has four levels of encapsulation:

• Packages define top-level scopes.
• Classes and Interfaces are scoped within packages.
• Fields and methods are scoped within classes.
• Local variables and parameters are scoped within methods.

There is actually a bit more. For example, outside of the source language, one can seal jar files so that packages are closed.