这个公式看起来复杂，但是里面的几个变量是可以忽略的。
That may look like a complicated equation, but a couple of the variables can be ignored.
如果使用了- jar选项，那么环境变量CLASSPATH和在命令行中指定的所有类路径都被j VM所忽略。
The environment variable CLASSPATH and any class path specified on the command line is ignored by the JVM if the -jar option is used.
或在编译时收到几个关于已不用的变量的警告，但是我相信它们是无害的，可以忽略它们。
I received a couple of warnings about obsolete variables when I compiled, but I believe they are harmless enough to ignore.
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