Ubuntu14.04 Installing Oracle JDK

Install Oracle jdk6,7 or 8 in Ubuntu 14.04.

Preparing: Adding Add-apt-repository Tools

Install python-software-properties
#apt-get Install Software-properties-common

First step: Add PPA repository to the system

#add-apt-repository Ppa:webupd8team/java 

Step Two: Update

#apt-get Update

Step three: Download and install the JDK

Install Oracle-java6-installer

Here is the installation of JDK6, if you want to install JDK7 or JDK8, the above statement 6 to the corresponding number can be changed.

Fourth Step: Set as Default (skip this step if you don't have another version of the JDK installed)

Install Oracle-java6-set-default

Similarly, it is necessary to change the 6 to the corresponding 7 or 8.

Fifth Step: View version

#java-version  

Sixth step: Setting environment variables

At the end of the/etc/profile file, add:

#vi /etc/profile

Add at the end of the file

#jdkexport java_home=/usr/lib/jvm/java-6-oracleexport jre_home=${java_home}/JRE  export CLASSPATH=.:${java_home}/lib:${jre_home}/lib  export PATH

To set up our installed JDK as the default JDK version, do the following.
Execute code:

#update-alternatives--install /usr/bin/java java/usr/lib/jvm/java-7300
#update-alternatives--config Java

Ubuntu14.04 Installing Oracle JDK