Install Oracle Java 7 in Ubuntu 12.10/12.04/11.10/Any Ubuntu or Linux Mint Version

Install Oracle Java 7 in Ubuntu 12.10/12.04/11.10/Any Ubuntu or Linux Mint Version/Other Ubuntu Based Distributions

Java is the foundation for virtually every type of networked application and is the global standard for developing and delivering mobile applications, games, Web-based content, and enterprise software. With more than 9 million developers worldwide, Java enables you to efficiently develop and deploy exciting applications and services. With comprehensive tooling, a mature ecosystem, and robust performance, Java delivers applications portability across even the most disparate computing environments. Java is free to download.

Why do I need Java?
There are lots of applications and websites that won't work unless you have Java installed, and more are created every day. Java is fast, secure, and reliable. From laptops to data-centers  game consoles to scientific supercomputers, cell phones to the Internet, Java is everywhere!

To install Java in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

Terminal Command:
sudo mkdir -p /usr/local/java

>> For 32-bit users:

Terminal Commands:
wget -O jre-32bit.tar.gz http://drive.noobslab.com/data/JAVA/jre-7u12-ea-bin-b05-linux-32bit.tar.gz
wget -O jdk-32bit.tar.gz http://drive.noobslab.com/data/JAVA/jdk-7u12-ea-bin-b05-linux-32bit.tar.gz
sudo -s cp -r jre-32bit.tar.gz /usr/local/java
sudo -s cp -r jdk-32bit.tar.gz /usr/local/java
cd /usr/local/java
sudo -s tar xvzf jre-32bit.tar.gz
sudo -s tar xvzf jdk-32bit.tar.gz

>> For 64-bit users:

Terminal Commands:
wget -O jdk-64bit.tar.gz http://drive.noobslab.com/data/JAVA/jdk-7u12-ea-bin-b05-linux-64bit.tar.gz
wget -O jre-64bit.tar.gz http://drive.noobslab.com/data/JAVA/jre-7u12-ea-bin-b05-linux-64bit.tar.gz
sudo -s cp -r jre-64bit.tar.gz /usr/local/java
sudo -s cp -r jdk-64bit.tar.gz /usr/local/java
cd /usr/local/java
sudo -s chmod a+x jre-64bit.tar.gz
sudo -s chmod a+x jdk-64bit.tar.gz
sudo -s tar xvzf jre-64bit.tar.gz
sudo -s tar xvzf jdk-64bit.tar.gz

Now you need to enter these command (both 32-bit and 64-bit users):

Terminal Command:
sudo nano /etc/profile

Add the following lines at the end of file:

JAVA_HOME=/usr/local/java/jdk*
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
JRE_HOME=/usr/local/java/jre*
PATH=$PATH:$HOME/bin:$JRE_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH

Copy above lines and to paste in terminal (Press Ctrl+Shift+V) and to save file using nano (Press Ctrl+O) then (Press Ctrl+X) to exit from file.

Now enter following commands one by one in terminal:

Terminal Commands:
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jre1.7.0_12/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.7.0_12/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jre1.7.0_12/bin/javaws" 1
sudo update-alternatives --set java /usr/local/java/jre1.7.0_12/bin/java
sudo update-alternatives --set javac /usr/local/java/jdk1.7.0_12/bin/javac
sudo update-alternatives --set javaws /usr/local/java/jre1.7.0_12/bin/javaws
. /etc/profile

Check installed java version

Terminal Command:
java -version

That's it

Source: Java