Configuring the Java Development Kit
After the InstallShield wizard installs the JDK, you must edit your computer's environment variables to include references to the kit.
Experienced MS-DOS users can finish setting up the JDK by adjusting two variables and then rebooting the computer:
Edit the computer's PATH variable and add a reference to the Java Development Kit's bin folder (which is C:\Program Files\Java\jdk1.5.0\bin if you installed the kit into the C:\Program Files\Java\jdk1.5.0 folder).
Edit or create a CLASSPATH variable so that it contains a reference to the current folder—a period character and semicolon (“.;” without the quotation marks)—followed by a reference to the tools.jar file in the kit's lib folder (which is C:\Program Files\Java\jdk1.5.0\lib\tools.jar ...