A Java program simulating an airline check-in process.
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There are two kinds of passenger, first-class passenger and normal passenger.
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Correspondingly, there are two kinds of check-in desks.
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First-class check-in desks generally operate faster than normal passenger check-in desks.
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If there exists first-class passenger, first-class check-in desks will always serve them first. If there is no first-class passenger, first-class check-in desks also serve normal passengers.
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Normal check-in desks never serve first-class passengers.
Statistic data in the end
