How to install JDK in Linux

INTRODUCTION

This post will be the step by step guide to install the JDK in Linux Platform.

1. DOWNLOAD

Download jdk-7u79-linux-x64.tar.gz file the oracle website.

2. INITIAL SETUP

Create a new folder 'java' under /usr

3. UNZIP THE DOWNLOADS

Unzip jdk-7u79-linux-x64.tar.gz to /usr/java

Now the folder structure would be  /usr/java/jdk1.7.0_79

4. SET JAVA_HOME

1. Check already set or not => $ echo $JAVA_HOME
2. If Not, => $ export JAVA_HOME=/usr/java/jdk1.7.0_79
3. Check JAVA_HOME now => $ echo $JAVA_HOME

/usr/java/jdk1.7.0_79

5. SET CLASSPATH VARIABLE

1. Check already set or not => $ echo $CLASSPATH
2. If Not,  => $ export CLASSPATH=$JAVA_HOME'\lib'
3. Check CLASSPATH now => $ $ echo $CLASSPATH

/usr/java/jdk1.7.0_79\lib

6. SET PATH VARIABLE

1. Check already set or not => $ echo $PATH
2. If not, => $ export PATH=$JAVA_HOME'\bin'

by default there will be some PATH variable set already, then do as 6.4

3. Check PATH now => $ $ echo $PATH

/usr/java/jdk1.7.0_79/bin

4. If already PATH set, then $ export PATH=$PATH:$JAVA_HOME'/bin'

<existing path variables>:/usr/java/jdk1.7.0_79/bin

Now you will be able to run any java program in Linux. Please reply in comment box if you are facing any error during any of the above steps.