Here is how to setup JAVA_HOME and PATH environment variables for a single user or all users on Fedora Linux system.
Setting JAVA_HOME and PATH for a single user
add following lines in the end of ~/.bash_profile
export JAVA_HOME=/opt/jdkx.x.x_xx export PATH=$PATH:$JAVA_HOME/bin
Setting JAVA_HOME and PATH for all users
add following lines in the end of /etc/profile
export JAVA_HOME=/opt/jdkx.x.x_xx export PATH=$PATH:$JAVA_HOME/bin
Apply the change
source /etc/profile
Setting JAVA_HOME for a single user and all users
原文：http://my.oschina.net/sunpr/blog/349328