java on LINUX platform

I have very big problem when i run java prog. on linux plateform
the prob. are

1. How set the classpath in linux.

2. How find the s/w of linux which requires java like "java for
linux", "oracle for linux"- for conecting database .....so on.

3.how to install these s/w.

4.how to run prog. on linux of java.

I want to work with java on linux plateform. So please reply me.

Because I want to work with only java with linux plateform.

if you use netbeans ide then go to properties of your program and then you find
to set class path. by selecting properties you must enter the directory of
oracle properties and the class path of the ojdbc14.jar and ojdbc15.jar. then
you can find the oracle driver. then you can write sql command in java class.
to install jdk first download jdk.bin file and write command on the terminal sh
/dir/jdk.bin. other things are as same as windows