"This update uninstalls the Apple-provided Java applet plug-in from all web browsers. To use applets on a web page, click on the region labeled "Missing plug-in" to go download the latest version of the Java applet plug-in from Oracle."
If you wish to re-enable the original Java applet plug-in - which is not uninstalled, as claimed above, but simply disabled - Apple has published a technical note explaining how to do this. There are a few Terminal commands, including creating a couple of symlinks. The technical note also explains how to disable Java Web Start.
The technical note also gives a URL where you can download the Oracle Java 7 JRE, which will be the future version of Java for OS X.

