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Programming Unit We are going to use the Java programming language for our unit on computer programming. In order to use Java on your computer (or the lab computer), we need to download, install, and configure it. You can download Java for free. Most you already have the JRE (Java Runtime Environment) installed; this is what allows Java applets to run in a browser. To write and compile programs, however, we need the JDK (Java Development Kit). You can download the JDK from http://www.oracle.com/technetwork/java/javase/downloads/jdk-6u25-download346242.html. There is a separate download for each operating system; choose the correct one for your machine. Run and install the download. The default installation folder is, in my opinion, not convenient. So I suggest directing the installation wizard to install into a new folder: C:\jdk (we will store all the code we write in C:\java). Then you will need to change the path. If you don’t know what this means, don’t worry about it, just follow these instructions. (Read http://introcs.cs.princeton.edu/15inout/windows-cmd.html for tips and hints in this area.) On my Windows 7 machine, I change the path in this way. Under the “Start” button, right-click on “Computer” and select Properties. Choose “Advanced system settings” on the left. At the bottom, there’s a button called “Environment Variables…” You should click that. Highlight “Path” in the top window and click the “Edit” button. At the beginning of the path, add “C:\jdk;” (don’t forget the semi-colon). We will go over how to navigate in the command window, but there are tips on the Princeton site linked above. You will need to use a text editor to write your Java code. You cannot use Word or any other word processor. You want a bare-bones text editor that doesn’t add formatting to the text. Notepad (included on each Windows install) is perfect for this, but I like to use Notepad++ (a free download from http://notepad-plusplus.org/download).