2. install jdk : rpm -ivh jdk-7u45-linux-x64.rpm
3. config jdk :
# update-alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_45/bin/java 1888
# update-alternatives --config java
There are 3 programs which provide 'java'.
Selection Command
-----------------------------------------------
1 /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java
* 2 /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
+ 3 /usr/java/jdk1.7.0_45/bin/java
Enter to keep the current selection[+], or type selection number: 3
4. java -version to make sure install successfully.