System.getProperty()系统参数

   Properties props=System.getProperties(); 
//系统属性
   System.out.println("Java的运行环境版本："
+props.getProperty(
"java.version"
));
   System.out.println("Java的运行环境供应商："
+props.getProperty(
"java.vendor"
));
   System.out.println("Java供应商的URL："
+props.getProperty(
"java.vendor.url"
));
   System.out.println("Java的安装路径："
+props.getProperty(
"java.home"
));
   System.out.println("Java的虚拟机规范版本："
+props.getProperty(
"java.vm.specification.version"
));
   System.out.println("Java的虚拟机规范供商："
+props.getProperty(
"java.vm.specification.vendor"
));
   System.out.println("Java的虚拟机规范名称："
+props.getProperty(
"java.vm.specification.name"
));
   System.out.println("Java的虚拟机实现版本："
+props.getProperty(
"java.vm.version"
));
   System.out.println("Java的虚拟机实现供应商："
+props.getProperty(
"java.vm.vendor"
));
   System.out.println("Java的虚拟机实现名称："
+props.getProperty(
"java.vm.name"
));
   System.out.println("Java运行时环境规范版本："
+props.getProperty(
"java.specification.version"
));
   System.out.println("Java运行时环境规范供应商："
+props.getProperty(
"java.specification.vender"
));
   System.out.println("Java运行时环境规范名称："
+props.getProperty(
"java.specification.name"
));
   System.out.println("Java的类格式版本号："
+props.getProperty(
"java.class.version"
));
   System.out.println("Java的类路径："
+props.getProperty(
"java.class.path"
));
   System.out.println("加载库时搜索的路径列表："
+props.getProperty(
"java.library.path"
));
   System.out.println("默认的临时文件路径："
+props.getProperty(
"java.io.tmpdir"
));
   System.out.println("一个或多个扩展目录的路径："
+props.getProperty(
"java.ext.dirs"
));
   System.out.println("操作系统的名称："
+props.getProperty(
"os.name"
));
   System.out.println("操作系统的构架："
+props.getProperty(
"os.arch"
));
   System.out.println("操作系统的版本："
+props.getProperty(
"os.version"
));
   System.out.println("文件分隔符："
+props.getProperty(
"file.separator"
));   
//在 unix 系统中是＂／＂
   System.out.println("路径分隔符："
+props.getProperty(
"path.separator"
));   
//在 unix 系统中是＂:＂
   System.out.println("行分隔符："
+props.getProperty(
"line.separator"
));   
//在 unix 系统中是＂/n＂
   System.out.println("用户的账户名称："
+props.getProperty(
"user.name"
));
   System.out.println("用户的主目录："
+props.getProperty(
"user.home"
));
   System.out.println("用户的当前工作目录："
+props.getProperty(
"user.dir"
));