Example of using a Comparator to shuffle elements in an array.

Randomizer

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Random;

public final class Shuffler {
    private static final RandomComparator RANDOM_COMPARATOR = new RandomComparator();

    public static <T> List<T> shuffle(T[] args) {
        List<T> argList = Arrays.asList(args);
        argList.sort(RANDOM_COMPARATOR);
        return argList;
    }

    private static class RandomComparator implements Comparator {
        private final Random RANDOM = new Random();

        @Override
        public int compare(Object o1, Object o2) {
           return getRandomComparison();
        }

        /**
         * Generates an integer in the range of -1 ≥ n ≤ 1
         * @return int
         */
        private int getRandomComparison() {
            return (int) (-1 + (Math.round(RANDOM.nextDouble()) * 2));
        }
    }
}

Shuffler.shuffle(new String[]  { "one", "two", "three", "four", "five", "six" });
Shuffler.shuffle(new Integer[] { 1, 2, 3, 4, 5, 6});
Shuffler.shuffle(new Float[]   { 1.1F, 2.2F, 3.3F, 4.4F, 5.5F, 6.6F});

[one, two, three, four, five, six]
[3, 4, 6, 1, 2, 5]
[1.1, 2.2, 6.6, 3.3, 5.5, 4.4]