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.
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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:

>> For 32-bit users:

>> For 64-bit users:

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

Add the following lines at the end of file:
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:

Check installed java version
That's it
Source: Java
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