更好的控制Java程序的行为，使用Java虚拟机参数

Java程序执行在Java虚拟机至上，我们可以通过参数配置Java虚拟机的行为。

• Options that begin with -X are non-standard (not guaranteed to be supported on all VM implementations), and are subject to change without notice in subsequent releases of the JDK.
• Options that are specified with -XX are not stable and are subject to change without notice.

详情:

http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html