The private fields and methods of an object can only be accessed by the object itself and by other objects of the same class (siblings). An object may touch its
sibling's private parts. A sibling is an object in the same class but which is not the same object.
i read this from http://www.hig.no/at/data/progwww/Java/docs/3.doc
anyone had any example on how sibling can access a private field of another object?