In the first and second versions of Java (1.02 and 1.1), all classes that shipped with Java. There was always
java.lang, of course - the one you don't have to import. And there was java.net, java,io, java.util, java.awt, etc.
When you see a package in the library that begins with Javax, you know it started like an extension, and then
got a promotion. (like java.swing)
* Import classes
ArrayList<String> myList = new ArrayList<String>();
* Full name class
java.util.ArrayList<String> myList = new java.util.ArrayList<String>();