JRE And Ubuntu

[Jatin Davey]

Hi all

I have five questions:

1. Does the default ubuntu 9.10 download include JRE when we download 
the .iso files from a peer-to-peer network client like utorrent ?
2. If not which version of JRE can be installed without any issues on 
Ubuntu 9.10 ?
3. After installing JRE on ubuntu 9.10 how do i check whether it is 
installed or not ?
4. After installation where would normally get installed on a linux OS , 
It is under "Program Files" normally under windows OS ?
5. Does the CD have JRE in it ? Just want to make sure before 
downloading it.

Thanks
Jatin