pick up random set from given set

[vitthaldevkar]

int size = GetDataSet.setInt.size();
Set<Integer> randomSet = new HashSet<>();
for (int k = 0; k < size; k++) {
    int item = new Random().nextInt(size);
    int j = 0;
    for (int mbr : GetDataSet.setInt) {
        if (j == item) {
            randomSet.add(mbr);
        }
        j = j + 1;
    }
}// kth loop end