Java Installation in Ubuntu

Method 1

Step 1: download jdk from: http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

 

Step 2 : go to downloaded folder using command line terminal :

 cd ~/Download 

Step 3: install jdk

sudo tar -xzvf  jdk-7u21-linux-i586.tar.gz --directory=/usr/local/

sudo ln -s /usr/local/[jdk_folder_name]/ /usr/local/jdk

* change the folder name according to extracted jdk folder name,
 

Step 4: open .bashrc

sudo gedit .bashrc

Step 5: add following line end of the .bashrc file

export JAVA_HOME=/usr/local/jdk

Save and close .bashrc file.

Step 6: compile .bashrc file

source .bashrc

 

Step 7:  now test whether java is installed properly or not: goto terminal and time following line

java -version

if java is installed properly, java runtime information will be displayed.


if not… follow second method:
Method  2:

Step 1:  Preparing your system

First you need to remove openjdk for this run the following command from your terminal

 sudo apt-get purge openjdk*

Step 2:  If you installed java 7 from any other PPA and you are having problem with java then you have to do following steps before installing the PPA mentioned here

sudo rm /var/lib/dpkg/info/oracle-java7-installer*

sudo apt-get purge oracle-java7-installer*

sudo rm /etc/apt/sources.list.d/*java*

sudo apt-get update

Step 3:  Install oracle java 7 in ubuntu 13.04/12.10/12.04

Open the terminal and run the following commands

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update

sudo apt-get install oracle-java7-installer

now give a smile 🙂 🙂 😀

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