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Kevin IM-ed me yesterday with the following question:

How come foo.getBar() == expectedBar is true yet foo.getBar().equals(expectedBar) is false?

I'll make that today's Java quiz: Have you encountered a situation in non-play code where obj1 == obj2 is true yet obj1.equals(obj2) is false?

By non-play code I mean a code base where all equals() and hashCode() overrides honor their contracts. In other words, there are no silly code like

public void equals(Object other) {
  return false;
}