This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Explanation : Java applications, which are hosted on a local machine and run like any other program, and Java applets, which are hosted on web sites and run when a web site visitor arrives at a particular page. Java applets are treated differently from Java applications. Because they are untrusted code, the virtual machine runs them in a "sandbox" that restricts what they are allowed to do. In general, the sandbox is designed to prevent a Java applet from making any changes to the data on the user's computer. The vulnerability at issue here involves the sandboxing function, and so affects only Java applets