This post explains how to install Java or check which version is running on your machine. Install on any OS, and learn about the JDK.

[Dimitri] sent in a project he’s been working on that implements a Java Virtual Machine purely in C, and is easily portable between microcontrollers such as the AVRs and PICs we normally see,… ...

Microsoft had its own Java Virtual Machine (JVM) for several years, but terminated support at the end of 2007. See applet, HotSpot JVM, Java, Java Runtime Environment, bytecode and intermediate ...