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PurchaseOrderHashCode

Language/Type: Java hashing hashCode
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Write a hashCode method for a PurchaseOrder class representing a purchase of an item from an online store, whose fields are a item ID string, a quantity as an integer, and a price as a real number. Follow the general contract for the hashCode method, and try to distribute codes well among accounts. Assume you are adding your method to the following class: 

public class PurchaseOrder {
    private String itemID;
    private int quantity;
    private double price;
    ...
}
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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