linux update jdk

1. Upload the jdk version of the package

　　Download JDK address: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

2. Decompression

tar -zxvf /package/jdk-7u80-linux-x64.tar.gz or rename: mv jdk1.8.0_lll jdk1.8

3. Configure jdk variables and edit the profile file

　　vi /etc/profile

export JAVA_HOME=/package/jdk1.7.0_80
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

6. Refresh the system version:

 　source /etc/profile to make the profile file take effect immediately

source /etc/profile