Which program is the jvm?

Hi!
in windows system , jvm.dll is the jvm program. but in Linux system,I don't know which program is the main program of jvm? Is java in bin directory only a classloader?

We can ask: how comes that "java" is a very small executable?
ijbalazs@bijpc:/usr/lib/jdk1.4.2> find . -name java -ls
248167 24 -rwxr-xr-x 1 root root 24564 j�n 20 2003 ./bin/java
247526 24 -rwxr-xr-x 1 root root 24564 j�n 20 2003 ./jre/bin/java
Well, maybe so:
ijbalazs@bijpc:/usr/lib/jdk1.4.2> find . -name libjvm.so -ls
247551 5044 -rwxr-xr-x 1 root root 5159829 j�n 20 2003 ./jre/lib/i386/client/libjvm.so
247545 7487 -rwxr-xr-x 1 root root 7657624 j�n 20 2003 ./jre/lib/i386/server/libjvm.so
ijbalazs@bijpc:/usr/lib/jdk1.4.2>

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