Questions about GCJ

[Harmanpaul S Gill]

Hello Sir/Madam,

I wanted to request the following information about
GCJ project which I couldn't find online , please
provide me a link or contact of a person who can help
me.
1. How is concurrency achieved in GCJ?
2. How is the decison made on accepting a
contribution/code? 
3. Is the conversion of Java source code to native
machine  code with GCJ equal to running it?

Regards,
Harman 

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