Forms
Encapsulation may be weakened by declaring internal members public or by providing free access to data via public getter/setter methods. The access need not be public: for details see e.g. Java access modifiers and the Accessibility Levels in C# (MSDN). In C++, encapsulation is also weakened by declaring friend-classes or -functions.
An object may also make its internal data accessible by passing references to them as arguments to methods or constructors of other classes, which may retain references.
On the other hand, objects holding references to one another, though sometimes described as a form of object orgy, does not in itself breach encapsulation.
Read more about this topic: Object Orgy
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