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sockPairs

Language/Type: Java Guava Multiset collections
Author: Marty Stepp (on 2013/01/22)

A common complaint is that people can't find one of the two socks in a matching pair after they do the laundry. So in this problem you'll write a method named sockPairs that looks at a collection of socks in the laundry and determines whether all types of socks occur exactly twice. Your method accepts an array of strings as a parameter; each string represents a type of sock. Your method should examine the list and return true if every unique string in the list occurs exactly 2 times, or false if any string does not occur exactly 2 times. An empty array should also cause your method to return true. For example, if passed the array [green, white, green, polkadot, red, black, red, white, black, polkadot], your method should return true because every string occurs exactly twice. If passed [green, white, green, green, white, green, red], your method should return false because "green" occurs 4 times and "red" occurs only once.

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This is a method problem. Write a Java method as described. Do not write a complete program or class; just the method(s) above.

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