java on linux

I just installed j2sdk1.4.0 and tomcat4.0.1 on my linux machine. I am new for java .So please tell me how can I checked that Tomcat is running in proper way on my machine and how can I run a java program on my machine.Is there any demo program for it.
I want to say thanks in advance for your innovative help.

Thank you.

 

 

 

 

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