Java Utililty Methods Random String

final StringBuilder builder = new StringBuilder();
for (int i = 0; i < length; i++) {
    builder.append(i);
return builder.toString();

String candidateChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
StringBuilder sb = new StringBuilder();
Random random = new Random();
for (int i = 0; i < length; i++) {
    sb.append(candidateChars.charAt(random.nextInt(candidateChars.length())));
return sb.toString();

String str = "";
for (int i = 0; i < 10; i++)
    str += new Random().nextInt();
return str;

String characters = "abcdefghijklmnopqrstuvwxyz123456789";
int length = generateRandomNumber();
char[] text = new char[length];
for (int i = 0; i < length; i++) {
    text[i] = characters.charAt(random.nextInt(characters.length()));
return new String(text);

return generateRandomString(RANDOM_STRING_COUNT);

Random rnd = new Random();
if (rnd.nextInt(3) == 0) {
    return "";
} else {
    return "test" + rnd.nextInt();

StringBuffer strBfrRandom = new StringBuffer();
for (int i = 0; i < RANDOM_STRING_LENGTH; i++) {
    int intNumber = getRandomNumber();
    char character = CHAR_LIST.charAt(intNumber);
    strBfrRandom.append(character);
return strBfrRandom.toString();

int s = RAND.nextInt(CHARS.length());
StringBuilder sb = new StringBuilder();
for (int i = 0; i < MIN_NO_OF_CHARS + s; ++i) {
    sb.append(CHARS.charAt(RAND.nextInt(CHARS.length())));
return sb.toString();

return Long.toHexString(Double.doubleToLongBits(Math.random()));

if (minCharLen > maxCharLen) {
    throw new IllegalArgumentException(
            "Maximum Character Length must be larger than the Minimum Character Length");
StringBuilder builder = new StringBuilder();
generateCharacterList();
int len = (int) (Math.random() * (minCharLen - maxCharLen)) + minCharLen;
Random r = new Random();
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