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DateHashCode

Language/Type: Java hashing hashCode
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Write a hashCode method for a Date class, whose fields are a year, month, and day as integers. Follow the general contract for the hashCode method, and try to distribute codes well among all legal dates. Assume you are adding your method to the following class: 

public class Date {
    private int year;
    private int month;
    private int day;
    ...
}
Partial class: Write code that will become part of an existing class as described. You do not need to write the complete class, just the portion described in the exercise.

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