how do I change the security to allow Java to operate on a I book pro

Hi, Wat123.

Thank you for visiting Apple Support Communities.

I am not clear on if you are having issues with Java installation or launch. If you are receiving alerts when attempting to install. check to make sure that under General in Safari preferences that “Open ‘safe’ files after downloading” is enabled. Test installing a Java after making the change.

If the Widget Installer doesn’t open automatically when you use Safari to download, choose Safari > Preferences, click General, then select “Open ‘safe’ files after downloading.”

Also, check the settings in Gatekeeper to make sure it is set to Mac App Store and identified developers.

OS X: About Gatekeeper

http://support.apple.com/kb/ht5290

Cheers,

Jason H.