Install JDK 7 in Linux

First download jdk-7-linux-i586.tar.gz on the official website

Enter the command tar-zxvf./jdk-7-linux-i586.tar.gz in the terminal

Then sudo mkdir/usr/lib/JVM

Then sudo mV./jdk1.7.0.03/usr/lib/JVM/

Then set the environment variable

Sudo VI ~ /. Bashrc

Add

Export java_home =/usr/lib/JVM/jdk1.7.0 _ 03
Export jre_home =$ {java_home}/JRE
Export classpath =. :$ {java_home}/lib :$ {jre_home}/lib
Export path =$ {java_home}/bin: $ path

Save and exit

Enter source ~ on the terminal ~ /. Bashrc to make it take effect

Last run

Sudo Update-alternatives -- install/usr/bin/Java/usr/lib/JVM/jdk1.7.0 _ 03/bin/Java 300

Sudo Update-alternatives -- install/usr/bin/javac/usr/lib/JVM/jdk1.7.0 _ 03/bin/javac 300

Sudo Update-alternatives -- config Java

Only one JDK version is found

Running Java-version shows normal, JDK is installed successfully