These notes are written for Java 2 Standard Edition version 5.0 or higher. Many features were added to version 5.0 and previous versions will not work with these notes. The current version of Java (as of August 2008 is version 6.0). If you already have version 5.0 installed, that should be fine, and you need to do nothing. If you are installing Java for the first time on your computer, install Java 2 Standard Edition version 6.0 or higher.
Many text books come with CDs which can be used to install Java. Use that CD if you have one.
Is it necessary to spend lots of money to get Java?