Install JDK7 on Ubuntu 12.10

Note : This is applicable for Any Java Version and Any Ubuntu Version

• Download the JDK disiered version and extract the .bin file
• Move the extracted folder to the default JVM folder

• Install new java source in system:

sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_15/bin/javac 1
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_15/bin/java 1
sudo update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.7.0_15/bin/javaws 1

• Select default java:

sudo update-alternatives --config javac

sudo update-alternatives --config java

sudo update-alternatives --config javaws

• Test the updated java version:

java -version

• Verify the all point to the new java location:

ls -la /etc/alternatives/java* 

There is a GUI tool in Ubuntu called "Alternative Configurator" which you can manually 

update above.