在程序运行中，如何得到JVM的版本号？在线等待

Question

key meaning
  ____________ ______________________________
  java.version Java version number
  java.vendor Java vendor-specific string
  java.vendor.url          Java vendor URL
  java.class.version Java class version number
  os.name          Operating system name
  os.arch          Operating system architecture
  os.version         Operating system version
  file.separator         File separator (eg, "/")
  path.separator        Path separator (eg, ":")
  line.separator         Line separator 
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
how to use it:
  String s = System.getProperty("java.version");

Answer 1

Applets are prevented from reading these system properties: 
  key meaning
  ____________ _____________________________
  java.home Java installation directory
  java.class.path          Java classpath
  user.name User account name
  user.home User home directory
  user.dir User's current working directory

Answer 2

(System.getProperties()).list(System.out);
慢慢看吧。
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