what is a java virtual machine?
each java application runs inside a runtime instance of some concrete implementation of the abstract specification of the java virtual machine. 【相关文章:asp.net里datagrid ite】
to understand the java virtual machine you must first be aware that you may be talking about any of three different things when you say "java virtual machine." you may be speaking of: the abstract specification, a concrete implementation, or a runtime instance.
the abstract specification is a concept. concrete implementations, which exist on many platforms and come from many vendors, are either all software or a combination of hardware and software. a runtime instance hosts a single running java application. 【扩展阅读:EDI技术浅述-EDI的交通运输方面的应】
the lifetime of a java virtual machine
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