Java Installation
Java installation is totally depends upon your preference , you can install it through command line or you can downloade tar.gz from oracle site, I prefer second way, So I am explaining how to install java using tar.gz.
1)- Download java from oracle site. my download directory is /media/amit.pathak/download
http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html.
2)- Copy java tar from download location to any standard location like I move it to /usr/local/java.
sudo cp /media/amit.pathak/download/jdk-7u79-linux-x64.tar.gz /usr/local/java
3)- Extract tar at same location
a)- cd /usr/local/java
b)- tar xvzf jdk-7u79-linux-x64.tar.gz
4)- Change user
sudo chown amit.pathak:amit.pathak -R FOLDERNAME
5)- Open profile file to put java path
sudo nano /etc/profile
add below lines at file bottom
JAVA_HOME=/usr/local/java/java7
JRE_HOME=$JAVA_HOME/jre
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH
ctrl + x --> hit Y --> hit Enter
6)- execute command -> source /etc/profile to load save data.
7)- Now it's turn to say ubuntu hi I want to use new java, you can execute below command
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.7.0_49/jre/bin/java" 0
0 - If you dont have any version of java already install on your machine
to check execute
sudo update-alternative --config java
it will list out all java flavor installed on your system.
Now you are done with your java installation, you can verify same by running command java or javac
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