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

The distinction is that the JDK is a package of tools for developing Java-based software, whereas the JRE is a package of tools for running Java code.

If you own an Apple device, you can't run Java—at least not as Java, although there is a project to port Java code to Objective C but that's another story. If you own a Windows-based or Android ...