Aliasing occurs when the same memory location is accessed through more than one reference. Often this is a good thing, but frequently it occurs in an unexpected way, which leads to confusing bugs. What's happening here is that when we do the assignment, the partyDate variable is assigned a reference to the same object that the retirement data refers to. If I then alter the internals of that object with setDate then both variables are updated, since they refer to the same thing.
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