Java Utililty Methods Random Number

List of utility methods to do Random Number

  1. HOME
  2. Java
  3. R
  4. Random Number

Description

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

Method

StringgetNumberedUsername(String fn, String ln)
get Numbered Username 
Random r = new Random();
return fn + ln + r.nextInt(100);
intgetNumberInRange(int minimum, int maximum)
Produces a number within the specified range. 
return new Random().nextInt(maximum - minimum + 1) + minimum;
longgetNumberLong()
get Number Long 
return Math.abs(ran.nextLong());
StringgetNumbers()
get Numbers 
Random random = new Random();
String result = random.nextInt(1000000) + "";
if (result.length() != length) {
    return getNumbers();
return result;
StringgetNumbersAndAlphabet()
get Numbers And Alphabet 
Random random = new Random();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
    sb.append(getRandomString(random.nextInt(randString.length())));
return sb.toString();
StringgetNumString(int length)
get Num String 
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
    sb.append(NUMBERCHAR.charAt(random.nextInt(NUMBERCHAR.length())));
return sb.toString();
StringgetPhoneNumber()
get Phone Number 
return "0011" + getRandomNumber(9) + getRandomNumber(9) + getRandomNumber(9) + getRandomNumber(9)
        + getRandomNumber(9) + getRandomNumber(9) + getRandomNumber(9) + getRandomNumber(9)
        + getRandomNumber(9) + getRandomNumber(9);
intgetPositiveNumber(int maximum)
Gets a random positive number with specified length. 
return RANDOM.nextInt(maximum) + 1;
StringgetRandNum(int charCount)
get Rand Num 
String charValue = "";
for (int i = 0; i < charCount; i++) {
    char c = (char) (randomInt(0, 10) + '0');
    charValue += String.valueOf(c);
return charValue;
StringgetRandNum(int num)
get Rand Num 
String res = "";
if (num < 1)
    return res;
String arr[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
for (int i = 0; i < num; i++) {
    Random ran = new Random();
    int index = ran.nextInt(10);
    res = res + arr[index];
...