The Guide shows you How to Install the Latest Oracle-Sun Java JDK 7 SE 64-bit Release for openSUSE 12.3 KDE4 x8664 Desktop.
Especially relevant: At the Same Time I’m also illustrating here the Easiest Way of Installing the New Downloaded .rpm Packages with Dependencies on openSUSE KDE4 Desktop :)
To the Article Bottom Link to Installing the Latest Tomcat7 Java Server on openSUSE Linux.
The Screenshots of Installation Correspond to the Install on a OpenSuse 12.3 KDE4 Desktop but the Procedure on GNOME, XFCE… Should be Near Identical.
So Take the Time of Carefully Reading and Executing the Instructions Contained Here and All should Work Like a Breeze :)

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Download Oracle-Sun Java SE JDK 7:
Oracle JDK Linux x64.rpm