The Guide shows you Step-by-Step How to Install and Getting-Started with the Oracle-Sun Java JDK 7 Official Release for Linux Red Hat RHEL 6.4 GNOME x8664 Desktop.
The Screenshots of Installation Correspond to the Install on a RHEL 6 GNOME Desktop but the Procedure on KDE, XFCE… Should be Near Identical.
Following the Easiest and Practicable Way I have Expressly Excluded the Use of Terminal Commands here.
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