Re: How to let the methods of a class only can be invoked by a special package(the class not in the package)?

Jebel.Star@gmail.com writes:


  Any static measure is insufficient, because new classes
  can be generated and loaded at run-time. Such classes would
  not have been inspected by a static measure.

  Therefore, the measure must be dynamic. The answers I am aware
  of have implied that ?A.GetInstance()? will somehow check its
  caller. Such answers do not actually address how to /prevent/
  the invocation, because at the time when ?A.GetInstance()?
  checks its caller it already /has been/ invoked, so it is too
  late to prevent it. The question was to prevent this, not to
  detect and report it, once it has happend.

  Therefore, it might not be possible to do this at all.

  One could use a patched JVM to do this.

  However, there might be multiple ?B? classes (one for each
  class loader). One also needs to specify which of them should
  be allowed to call ?A.GetInstance()?. For this, one needs
  to identify the class loaders involved.