The ILocale interface just introduces a new Locale constant for the Netherlands
and takes existing Locale country constants to group them together in this interface.
The PropertyCache is used to store information about the field/properties in
classes and cache them so that they can retrieved very fast at a later time.
A ReadWrapper object is used to use read and write methods on an input stream
and random access file without having to know which of those you you are currently
dealing with.
A WriteWrapper object is used to use read and write methods on an output stream
and random access file without having to know which of those you you are currently
dealing with.