Java Utililty Methods Random Number

if (randomNumber == null) {
    randomNumber = new Random();
    randomNumber.setSeed(System.currentTimeMillis());
int i = randomNumber.nextInt();
if (i < 0) {
    i *= -1;
return i;

int step = Math.abs(end - begin);
int random = new Random(System.nanoTime()).nextInt(step);
return Math.min(begin, end) + random;

StringBuilder num = new StringBuilder();
Random random = new Random();
for (int i = 0; i < digitNumber; i++) {
    num.append(random.nextInt(10));
return num.toString();

boolean chkExit = true;
int isValueOk = randGen.nextInt(digits + 1);
while (chkExit) {
    if (isValueOk < minNumber || isValueOk > maxNumber) {
        isValueOk = randGen.nextInt(digits + 1);
    } else {
        chkExit = false;
return isValueOk;

return genRandomString(1, NONEZERO_NUMBER_CHARS) + genRandomString(numberCount - 1, NUMBER_CHARS);

if (num < count) {
    return Collections.EMPTY_LIST;
List<Integer> result = new ArrayList<Integer>();
Map<Integer, String> containMap = new HashMap<Integer, String>();
Integer temp = null;
Random random = new Random();
for (int i = 0; i < count;) {
...

return getChance(number.intValue());

Random random = new Random();
int select = random.nextInt(99) * 1234;
int select2 = random.nextInt(alphas.length);
return alphas[select2] + "0" + select;

Random random = new Random();
Integer select = random.nextInt(999);
return select.toString();

return rand.nextInt();