Dalvik
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Dalvik is a purpose-built virtual machine designed specifically for Android, developed
by Dan Bornstein and his team at Google.
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The Java virtual machine (VM) was designed to be a one-size-fits-all solution, and the
Dalvik team felt they could do a better job by focusing strictly on mobile devices. They
looked at which constraints specific to a mobile environment are least likely to change
in the near future. One of these is battery life, and the other is processing power. Dalvik
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 Another side effect of replacing the Java VM with the Dalvik VM is the licensing.
Whereas the Java language, Java tools, and Java libraries are free, the Java virtual ma-
chine is not. This was more of an issue back in 2005 when the work on Dalvik started.
Nowadays, there are open source alternatives to Sun’s Java VM, namely the
OpenJDK and Apache Harmony projects.
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By developing a truly open source and license-friendly virtual machine, Android yet
again provides a full-featured platform that others are encouraged to adopt for a variety
of devices without having to worry about the license.
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