Java Utililty Methods Random String

List of utility methods to do Random String

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Description

The list of methods to do Random String are organized into topic(s).

Method

StringrandomString(int length)
random String 
if (length < 1) {
    return null;
char[] randBuffer = new char[length];
for (int i = 0; i < randBuffer.length; i++) {
    randBuffer[i] = numbersAndLetters[randGen.nextInt(71)];
return new String(randBuffer);
...
StringrandomString(int length)
Generates a random string of length length, containing a-z, A-Z, 0-9 
return getRandomString(length);
StringrandomString(int length)
Returns a random String of numbers and letters of the specified length. 
if (length < 1) {
    return null;
if (randGen == null) {
    synchronized (initLock) {
        if (randGen == null) {
            randGen = new Random();
            numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz"
...
StringrandomString(int length)
Returns a random String of numbers and letters (lower and upper case) of the specified length. 
if (length < 1) {
    return null;
char[] randBuffer = new char[length];
for (int i = 0; i < randBuffer.length; i++) {
    randBuffer[i] = numbersAndLetters[randGen.nextInt(71)];
return new String(randBuffer);
...
Stringrandomstring(int lo, int hi)
randomstring 
int n = rand(lo, hi);
byte b[] = new byte[n];
for (int i = 0; i < n; i++)
    b[i] = (byte) rand('a', 'z');
return new String(b, 0);
StringrandomString(int stringLength)
random String 
StringBuffer s = new StringBuffer();
for (int i = 0; i < stringLength; i++) {
    int c = rand.nextInt(26);
    s.append(alphabet.charAt(c));
return s.toString();
StringrandomString(Integer len)
Generates random alpha-numeric string of specified length 
final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
Random rnd = new Random();
StringBuilder sb = new StringBuilder(len);
for (int i = 0; i < len; i++)
    sb.append(AB.charAt(rnd.nextInt(AB.length())));
return sb.toString();
StringrandomString(Random r, int minCount, int maxCount)
random String 
minCount = Math.max(Math.min(minCount, maxCount), 1);
maxCount = Math.max(minCount, maxCount);
final int stringCount = minCount + r.nextInt(maxCount - minCount);
char[] s = new char[stringCount];
for (int i = 0; i < stringCount; ++i) {
    s[i] = (char) (32 + r.nextInt(127 - 32));
return new String(s);
...
String[]randomSubset(String[] list, int count)
Returns a subset of the list supplied. 
if (list.length < count)
    return null;
Vector vList = new Vector();
for (int i = 0; i < list.length; i++) {
    vList.addElement(list[i]);
Random random = new Random(System.currentTimeMillis());
String RandomItems[] = new String[count];
...
StringrandomSuffix(final String name)
random Suffix 
return name + "-" + System.currentTimeMillis();