1. Download jre-6u18-linux-x64.bin (example) from Java.Sun.com to /usr/java
2. sh jre-6u18-linux-x64.bin
3.alternatives --install /usr/bin/java java /usr/java/jre1.6.0_18/bin/java 2
   alternatives --config java
There are 3 programs which provide 'java'.

Selection Command
-----------------------------------------------
*+ 1 /usr/lib/jvm/jre-1.4.2-gcj/bin/java
2 /opt/jdk1.6.0_07/bin/java
3 /usr/java/jre1.6.0_18/bin/java

Enter to keep the current selection[+], or type selection number: 3
4. Check Instalation
[root@localhost java]# java -version
java version "1.6.0_18"
Java(TM) SE Runtime Environment (build 1.6.0_18-b07)
Java HotSpot(TM) 64-Bit Server VM (build 16.0-b13, mixed mode)


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