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collectionMystery

Language/Type: Java Collection mystery Maps and Sets
Author: Allison Obourn (on 2012/08/29)

Write the output that is printed when the given method below is passed each of the following maps as its parameter. Your answer should display the right values in the right order. 

public static void mystery(Map<String, String> m) {
    Set<String> s = new TreeSet<String>();
    for (String key : m.keySet()) {
        if (!m.get(key).equals(key)) {
            s.add(m.get(key));
        } else {
            s.remove(m.get(key));
        }
    }
    System.out.println(s);
}
{sheep=wool, house=brick, cast=plaster, wool=wool}
{munchkin=blue, winkie=yellow, corn=yellow, grass=green, emerald=green}
{pumpkin=peach, corn=apple, apple=apple, pie=fruit, peach=peach}
{lab=ipl, lion=cat, terrier=dog, cat=cat, platypus=animal, nyan=cat}

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