Warning: you may get a dialog saying something about a "JAR archive security check". Note that DrJava won't run unless you have a Java 2 v1.3 (or later) virtual machine already installed. If you want, open this web page (by clicking the link) in your browser and choose another version of DrJava to download. This version is supposed to work whether you have Java 1.4.2 or The easiest thing for you to do is to download this version of DrJava It may be something like this (but read the instructions): There, you will find instructions on appending another directory to variable path. Bring up the help in your Windows system, open the index, and look for "path". If such a path is not there, you have to add it. This is a directory called bin inside the directory where you installed the sdk. There should be a path that looks like this: C:\j2sdk1.4.1_02\bin. The line that is printed contains path names separated by semicolons. Your system contains a variable that lists directories with executable files in them.
We explain this for Windows 2000 older windows systems are similar. If you cannot double-click on a jar file to start it running, or if you cannot execute any of the commands java, javac, javadoc, or jar, you probably have not set your path correctly. Also, choose the J2SE JDK or SDK (not just the JRE and not the "bundles" that include other programming environments, such as netBeans). See the Popular Downloads link on the right side of that page. If you need the Java software development kit (JDK) get it from this website: If you have a PC, this site can check whether you have it:
If you have a Macintosh running Mac OS X, you almost certainly have it. Don't attempt to download and install it unless you know you don't have it. You will need the Java software development kit (JDK) from the Sun website. We will not make use of the new features in Java 1.5.
For most of the semester, it will not matter which version you are using. The older version, Java 1.4.2, and the newer version, Java 1.5. Please note that there are two versions of Java. It is installed on CIT's computers throughout the campus and in the ACCEL lab. DrJava is a free environment for writing and running Java programs.
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