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Two-way Associations
Mostly, associations are travel in both directions, although not usually with same frequency. There are three approaches for the implementation.
Implementing it as a separate association object, i.e., independent of any class as shown in Figure. The association object can be implemented using two objects: one in forward direction and the other one in the reverse direction. This cause increases efficiency when hashing is used, instead of attribute pointer.
Figure: Implementation of association as an object
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