Java APIs

hi

i've came into this problem quite a some time already.. how to compile a .java file inside an org folder? here's what i mean..

i have a java file inside here..
D:\FYP\bcjdk14\bcprov-jdk14-125\src\org\bouncycastle\crypto\test\RegressionTest.java

how do i actually compile them? cause i can't compile them directly from the folder, right? cause if i did so, many errors will come out. Someone told me I have to compile the file from the org folder, but to no avail.
i tried running the command

D:\FYP\bcjdk14\bcprov-jdk14-125\src>javac org.bouncycastle.crypto.test.RegressionTest.java

but the error message:
error: cannot read: org.bouncycastle.crypto.test.RegressionTest.java
will pop out.. what should i actually do?

thanks a lot for helping.


*what i actually wants to do is i want to verify packages i downloaded, this is what I got from its website:
------------------------------------------------------------------------
To verify the packages, run the following Java programs with the appropriate classpath:

java org.bouncycastle.crypto.test.RegressionTest
------------------------------------------------------------------------