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:

http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

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 :

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

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


Third step : configure the environment.Order:

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1. cd ~
   
2. gedit .bashrc

and write the code as follows:

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

ok ,save,

then ,you can call the console ,input;

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1. java
   
2. 
   
3. javac
   
4. 
   
5. jar
   
6. 
   
7. ....

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