Java Utililty Methods Password Generate

List of utility methods to do Password Generate

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Description

The list of methods to do Password Generate are organized into topic(s).

Method

StringgeneratePassword(int length, String combination)
Generates a random password of length equal to length , consisting only of the characters contained in combination . 
char[] charArray = combination.toCharArray();
StringBuilder sb = new StringBuilder(length);
Random random = new Random();
for (int i = 0, n = charArray.length; i < length; i++) {
    sb.append(charArray[random.nextInt(n)]);
return sb.toString();
char[]generatePassword(int minLen, int maxLen, int noOfCAPSAlpha, int noOfDigits, int noOfSplChars)
generate Password 
if (minLen > maxLen)
    throw new IllegalArgumentException("Min. Length > Max. Length!");
if ((noOfCAPSAlpha + noOfDigits + noOfSplChars) > minLen)
    throw new IllegalArgumentException(
            "Min. Length should be atleast sum of (CAPS, DIGITS, SPL CHARS) Length!");
Random rnd = new Random();
int len = rnd.nextInt(maxLen - minLen + 1) + minLen;
char[] pswd = new char[len];
...
StringgenerateString(final String letters, int length)
Generates quasi-random String of given length. 
StringBuilder sb = new StringBuilder(length);
for (int i = 0; i < length; i++) {
    sb.append(letters.charAt(r.nextInt(letters.length())));
return sb.toString();
StringgenerateString(int length)
generate String 
StringBuilder sb = new StringBuilder();
for (int k = 0; k < length; k++) {
    char c = alphabet.charAt(random.nextInt(alphabet.length()));
    sb.append(c);
return sb.toString();
StringgenerateString(int length)
generate String 
StringBuffer sb = new StringBuffer();
Random random = new Random();
for (int i = 0; i < length; i++) {
    sb.append(bigChar.charAt(random.nextInt(bigChar.length())));
return sb.toString();
StringgenerateString(int length)
Creates a random string using only lowercase ascii letters, uppercase ascii letters, and digits. 
char[] buf = new char[length];
for (int i = 0; i < buf.length; i++) {
    buf[i] = chars.charAt(random.nextInt(chars.length()));
return new String(buf);
StringgenerateString(int length)
Generates a random string with a length of length. 
char[] chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
    char c = chars[random.nextInt(chars.length)];
    sb.append(c);
return sb.toString();
StringGenerateString(int Length)
Generate String 
char[] buf = new char[Length];
for (int idx = 0; idx < buf.length; ++idx)
    buf[idx] = Symbols[RandomSeed.nextInt(Symbols.length)];
return new String(buf);
StringgenerateString(int maxlength)
Generate a random string of a maximum length. 
String s = null;
Random r = new Random();
if (maxlength == 1) {
    int n = 97 + r.nextInt(26);
    char c = (char) n;
    s = Character.toString(c);
} else {
    s = Long.toString(Math.abs(r.nextLong()), 36);
...
StringgenerateString(String alphabet, int length)
generate String 
if (alphabet.length() == 0)
    return null;
StringBuilder ret = new StringBuilder(length);
for (int i = 0; i < length; ++i)
    ret.append(alphabet.charAt(random.nextInt(alphabet.length())));
return ret.toString();