Ubuntu14.04 install Oracle JDK

Ubuntu14.04 install Oracle JDK

Install Oracle JDK 6, 7, or 8 on Ubuntu 14.04.

Preparation: add-apt-repository Tool

#apt-get install python-software-properties
#apt-get install software-properties-common

Step 1: Add PPA repository to the System

#add-apt-repository ppa:webupd8team/java 

Step 2: Update

#apt-get update

Step 3: download and install JDK

#apt-get install oracle-java6-installer

JDK 6 is installed here. If you want to install JDK 7 or JDK 8, change 6 in the preceding statement to the corresponding number.

Step 4: Set to default (skip this step if JDK of another version is not installed)

#apt-get install oracle-java6-set-default

Similarly, you need to change 6 to the corresponding 7 or 8.

Step 5: view the version

#java -version  

Step 6: Set Environment Variables

Add the following content to the end of the/etc/profile file:

#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:${JRE_HOME}/lib  export PATH=${JAVA_HOME}/bin:$PATH 

To set the installed JDK to the default JDK version, perform the following operations.
Run the Code:

#update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-7-oracle/bin/java 300
#update-alternatives --config java

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