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HAS-A relationships are always defined with instance variables

 
Greenhorn
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In one of the mock up exam the answer above was marked as incorrect.

It is incorrect because class variables (statics) can also be used to define HAS-A relationships.

Can anyone help with an example?
 
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This is a slightly different type of composition as every instance of Dog shares the same instance of Family. However, there is still a has-a relationship: every Dog has-a Family.
 
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