Java Utililty Methods Random

List of utility methods to do Random

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Description

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

Method

StringcreateRandomStr(int digit)
create Random Str 
String base = "abcdefghijklmnopqrstuvwxyz0123456789";
int baseLength = base.length();
Random random = new Random();
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < digit; i++) {
    int number = random.nextInt(baseLength);
    stringBuilder.append(base.charAt(number));
return stringBuilder.toString();
Stringdecimal_random()
decimarandom 
String valor_retorno = new String("");
int[] ndigitos = new int[10];
int n;
Random rnd = new Random();
for (int i = 0; i < 10; i++)
    ndigitos[i] = 0;
for (long i = 0; i < 100000L; i++) {
    n = (int) (rnd.nextDouble() * 10.0);
...
booleanequalsRandomIterable(List a, List bl)
equals Random Iterable 
Iterator<?> it = bl.iterator();
for (Object anA : a) {
    if (it.hasNext()) {
        Object o2 = it.next();
        if (anA == o2)
            continue;
        if (anA == null)
            return false;
...
KextractRandomObject(Collection c)
extract Random Object 
if (c == null || c.size() == 0)
    return null;
int randomIndex = (int) (Math.random() * c.size());
Iterator<K> iter = c.iterator();
K o = iter.next();
while (iter.hasNext() && randomIndex-- > 0)
    o = iter.next();
return o;
...
VectorextractRandomVector(Collection c, int newSize)
extract Random Vector 
Vector cropped = new Vector();
if (c == null || c.size() < 1 || newSize < 1)
    return cropped;
int s = c.size();
int randomStep = 0;
Iterator<K> iter = c.iterator();
for (int i = 0; i < newSize; i++) {
    randomStep = (int) Math.floor(Math.random() * (s / newSize)) - 1;
...
intgaussianInt(Random random, int min, int max)
gaussian Int 
if (max < min) {
    throw new IllegalArgumentException("max < min");
double det = (random.nextGaussian() + GAUSSIAN_LIMIT) / GAUSSIAN_LIMIT / 2.0d;
return min + (int) (det * (max - min));
voidgenerateRandom(byte[] byteArray)
Generates a number of random alpha-numeric characters in US-ASCII 
int i;
randomGenerator.nextBytes(byteArray);
for (i = 0; i < byteArray.length; i++) {
    if (byteArray[i] < 0)
        byteArray[i] *= -1;
    while (!((byteArray[i] >= 65 && byteArray[i] <= 90) || (byteArray[i] >= 97 && byteArray[i] <= 122)
            || (byteArray[i] <= 57 && byteArray[i] >= 48))) {
        if (byteArray[i] > 122)
...
StringgenerateRandom(int length, int type)
generate Random 
if (1 == type) {
    Random r = new Random();
    int randNum = 0;
    while (randNum < 100000) {
        randNum = (int) r.nextInt(999999);
    return randNum + "";
String base = null;
if (2 == type) {
    base = "abcdefghijklmnopqrstuvwxyz";
} else {
    base = "abcdefghijklmnopqrstuvwxyz0123456789";
Random random = new Random();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
    int number = random.nextInt(base.length());
    sb.append(base.charAt(number));
return sb.toString();
StringgenerateRandom(Integer bitNum)
generate Random 
if (bitNum == null) {
    bitNum = 32;
String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
Random random = new Random();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < bitNum; i++) {
    int number = random.nextInt(base.length());
...
StringgenerateRandomIntegerId()
generate Random Integer Id 
Random random = new Random();
long abs = Math.abs(random.nextLong());
return String.valueOf(abs);