Coix aléatoire d'une liste

private static final Random RANDOM = new Random();

public static int randomInt(int minInclusive, int maxExclusive) {
    return RANDOM.nextInt(maxExclusive - minInclusive) + minInclusive;
}

public static List<Integer> randomIndex(int minInclusive, int maxExclusive, int sizeResult) {
    Set<Integer> result = new LinkedHashSet<>();
    while (result.size() != sizeResult)
        result.add(randomInt(minInclusive, maxExclusive));
    return new ArrayList<>(result);
}

public static <E> List<E> randomList(List<E> coll, int sizeResult) {
    List<E> result = new ArrayList<>(sizeResult);
    for (Integer n : randomIndex(0, coll.size(), sizeResult))
        result.add(coll.get(n));
    return result;
}

public static void main(String[] args) throws Exception {
    List<String> list = Arrays.asList("listT1", "listT2", "listT3");
    for (int n = 0; n <= list.size(); n++)
        System.out.println(n + "\t" + randomList(list, n));
}

0	[]
1	[listT3]
2	[listT2, listT1]
3	[listT1, listT3, listT2]