The Guide shows you in Easy-Steps How to Install Oracle-Sun Java JDK 7 i586 for Linux Mint 12 Lisa 32-bit Desktop.
To the Article Bottom there is a Link to Quick-Getting Started with Java Development and to Install Evernote Linux Clone on Linux Mint 13.
And this Visual Guide includes the Basic Screenshots of All GUI Steps involved.
The Contents and Details are Essentials and Give Focus only to Instructions and Commands.

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Here Download Oracle Java JDK:
Java JDK i586 tar.gzLink to Download the Latest Oracle-Sun Java Se JDK 32-bit Release -
Double-Click on the tar.gz Archive and Extract into /tmp
Extract it Into the /tmp Folder.
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Open a Terminal Window
(Press “Enter” to Execute Commands) -
Relocate JDK 7
Copysu
If Got “User is Not in Sudoers file” then see: How to Enable sudo
Copyif [ ! -d "/usr/lib/jvm" ]; then mkdir /usr/lib/jvm; fi
The above command is used to create a jvm directory if not already there.
Copysudo chown -R root:root /tmp/jdk1.7*
Reiterate the Execution Permission over the Java binaries
Copychmod -R +x /tmp/jdk1.7*/bin
Finally, Shift the Java contents with
Copymv /tmp/jdk1.7* /usr/lib/jvm/
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Installing Oracle Java JDK 7
Copyupdate-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7*/bin/java 1065
Copyupdate-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7*/bin/javac 1065
Copyupdate-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk1.7*/bin/jar 1065
Copyupdate-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.7*/bin/javaws 1065
Checking or Setting the System Java Version in Use with.
Copyupdate-alternatives --config java
And for the Java Compiler instead:
Copysudo update-alternatives --config javac
To Switch of Java Version Just Enter the Reference Number on First, Column. :)
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Getting-Started:
How to Install Evernote Clone on Linux Mint: