import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;

import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

/**
 * Created by isakow on 03.03.2017.
 */
public class Vikhorev {
    public static void main(String[] args) {
        int[] array = new Random().ints(10, 0, 5).toArray();
        Set<Integer> set = IntStream.of(array).boxed().collect(Collectors.toSet());
        List<Integer> list = new ArrayList<>();
        list.addAll(set);
        list.addAll(set);
        Collections.shuffle(list);
//        list.add(new Random().nextInt(list.size()), 5);
        list.add(new Random().nextInt(list.size()), 6);
//        list.add(new Random().nextInt(list.size()), 7);
        System.out.println("Массив парных значений рандомный + непаное(ые) в случайном месте: " + list);

        /**
         * use Multimap
         */
        ListMultimap<Integer, Object> lmm = ArrayListMultimap.create();
        list.forEach(l -> lmm.put(l, new Object()));
        System.out.print("Multimap: ");
        for (Integer integer : list) {
            List<Object> element = lmm.get(integer);
            if (element.size() == 1) {
                System.out.print(integer + " " );
            }
        }
        System.out.println();

        /**
         * use XOR
         */
        for (int i = 0; i < list.size() - 1; i++) {
            list.set(i + 1, list.get(i) ^ list.get(i + 1));
        }
        System.out.println("XOR: " + list.get(list.size()-1));
    }
}

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava-collections</artifactId>
            <version>r03</version>
        </dependency>