java的系统环境变量
写C/C++的程序员应该知道系统的环境变量会被经常用到。在java中由于有虚拟机，这些到用得不多了。但偶尔还是会用到的。下面列出java的环境变量，以备查用：able 13.1. Java System Properties
<div class="table-contents"><strong />System PropertyDescriptionjava.versionJava Runtime Environment versionjava.vendorJava Runtime Environment vendorjava.vendor.urlJava vendor URLjava.homeJava installation directoryjava.vm.specification.versionJava Virtual Machine specification versionjava.vm.specification.vendorJava Virtual Machine specification vendorjava.vm.specification.nameJava Virtual Machine specification namejava.vm.versionJava Virtual Machine implementation versionjava.vm.vendorJava Virtual Machine implementation vendorjava.vm.nameJava Virtual Machine implementation namejava.specification.versionJava Runtime Environment specification versionjava.specification.vendorJava Runtime Environment specification vendorjava.specification.nameJava Runtime Environment specification namejava.class.versionJava class format version numberjava.class.pathJava class pathjava.ext.dirsPath of extension directory or directoriesos.nameOperating system nameos.archOperating system architectureos.versionOperating system versionfile.separatorFile separator ("/" on UNIX, "\" on Windows)path.separatorPath separator (":" on UNIX, ";" on Windows)line.separatorLine separator ("\n" on UNIX and Windows)user.nameUser's account nameuser.homeUser's home directoryuser.dirUser's current working
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