Android does not have a JVM. While Android applications are written in Java, and initially compiled to Java bytecode, that bytecode is then translated into Davlik bytecode, and saved to a compact .dex executable, and run in the Davlik virtual machine. The Davlik virtual machine is quite different from the JVM. It is optimized for small devices. It is register-based rather than stack-based. It does not (currently) include a JIT compiler.
Yup, seems like a really clever way to give developers a familiar language with a huge library without having to make a deal with Sun (err Oracle) for a JVM license
