VMM is a program on a host system that lets one computer support multiple, identical execution environments.
VMM是主机系统上的一个程序,它让一台计算机支持多个相同的执行环境。
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When the Run program from Listing 1 begins execution, it's already been loaded by the default System classloader for the JVM (the one that works off the classpath you define).
I leave the task of scheduling the execution of the program to the reader, as system-dependent methods for doing so are often superior to simple programmatic ones.