Documents describing Java installation process

I come across many guys having doubt about installing java in the system. They always feel some problem in installing process that which should be installed and what is the purpose of the things etc...
That is why i want to give the links for better clarity. I think it will be helpful...

1. First of all we want to select the version which is to be installed.
2. After that following the links given below for installing process.
http://docs.codehaus.org/display/GEOSDOC/JDK+Install+Instructions
and
http://db.apache.org/derby/papers/DerbyTut/install_software.html

After installing for running programs we have to set " "path" and "classpath"
For this
Right Click on my computer
-->properties
---> advance
---->environment variable
check for "path" and "classpath" if these are there "do not erase current contents" but add these
path = d:\program files\java\jdk1.5.0\bin;
classpath = d:\program files\java\jdk1.5.0\lib;
hear' ; ' is seperator...
Other wise create path and classpath by new

After seting path and classpath we can happily run an execute the source code,,,,