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Alex Rivera
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What's the most compact code to compare three objects for (semantic) equality using Java? I have a business rule that the objects must be unique i.e. A is different to B, A is different to C and B is different to C. Assume that the objects are all of the same class and have correctly overridden equals and hashCode methods. A slight wrinkle is that object C could be null —if this is the case then A and B have to be different to each other. I have some code but it's a bit workmanlike for my tastes.
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