【Practice11_Zipcode_ArrayList】
Zipcode class:
//3 variables: zipcode, city, county, and compare by county
County:
//two variables: county and count, and define the getters & setters
Main:
//1.read the files,
//no need to define here since it was passed later on
//2.compare the zipcode by the county?
//2.compare the county by their count
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