主题：从曾经的Android组成员的角度来说说Android吧 -- zllwy

I confused the JVM here with VMware kind of VM. :)

Something I googled out:

Up until Android 2.2 (Froyo) the JVM (really a Dalvik JVM for licensing reasons) on the Android platform was playing with one hand tied behind its back. Different from desktop/server Java, the JVM was still an interpreter, like the original JVM back in the Java 1.0 days. It was very efficient interpreter but an interpreter none-the-less and was not creating native code from the Dalvik bytecodes that it uses. As of Android 2.2 they have added a JIT, a just-in-time compiler, to the stack that translates the Dalvik bytecode into much more efficient machine code much like a C/C++ compiler. You can see the results of this in the benchmarks of Froyo which show a 2-5x improvement. As they add more and more JIT and GC features that have appeared in HotSpot, JRockit, etc, you will likely see even more improvements over time — without having to change or recompile the 3rd party developed software.