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Using C#
Interface A,
Interface B,
Class AA:A
{
public AA(A a)
{
//...
}
}
Class BB:B
{
public BB(B b)
{
//...
}
}
are the code works fine and not cause the circular reference problem?
Why not? Syntax aside, self-similar structures appear all over computer science. Consider a binary tree: each node has a reference to two other trees (represented by their root nodes.) A typical way to make such a tree is a type that is constructed with not one, but two references to other instances of the type.
More generally, cycles in the type system are not the same as cycles in the object graph. Usually the first is by design, but the second has a way of turning into bugs..