install and configure the jdk on Ubuntu @JAVA

How To use the Java under Linux ?let's study.
First step : you need the jdk  packet .where download?as following URL:



and  i down the jdk-7u17-linux-i586.tar.gz

second step: change one directory ,(as /home/(my system name)/java/jdk)uncompress the packet ,order :

tar zxvf  jdk-7u17-linux-i586.tar.gz

then ,you will see a dirctory:jdk1.7.0_17


Third step : configure the environment.Order:

cd ~
gedit .bashrc

and write the code as follows:

#JAVA runtime environment
export JAVA_HOME=/home/ubuntu/java/jdk/jdk1.7.0_17
export PATH=$JAVA_HOME/bin:$PATH

ok ,save,

then ,you can call the console ,input;

java

javac

jar

....

to test.it's proof thar you are right if you see the result as follows.