FindDups2

C:\ece595_06\collections>java FindDups2 red green yellow red blue pink blue
Unique words:    [green, pink, yellow]
Duplicate words: [red, blue]

`FindDups2.java`

import java.util.*;

public class FindDups2 {
    public static void main(String[] args) {
        Set<String> uniques = new HashSet<String>();
        Set<String> dups    = new HashSet<String>();

        for (String a : args)
            if (!uniques.add(a))
                dups.add(a);

        // Destructive set-difference
        uniques.removeAll(dups);

        System.out.println("Unique words:    " + uniques);
        System.out.println("Duplicate words: " + dups);
    }
}

Maintained by John Loomis, updated Tue Oct 15 19:06:46 2013