Software is more about design and organization than about the language and syntax rules of curly braces and semicolons. You should be able to look at a UML class diagram and picture the code that is built from it$.$ Conversely, given a set of classes, you should be able to create a UML class diagram from them. There are even commercial tools that can do that translation back and forth for you: from diagram to code and back.

Now that you have downloaded the Java Development Kit $($JDK$)$ and the integrated development environment $($IDE$),$ Eclipse, to your desktop, you will use this as an opportunity to examine the source code files to create a UML class diagram.