Java Utililty Methods ThreadLocalRandom

List of utility methods to do ThreadLocalRandom

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Description

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

Method

StringgenerateString(Random rng, String characters, int length)
generate String 
char[] text = new char[length];
for (int i = 0; i < length; i++) {
    text[i] = characters.charAt(rng.nextInt(characters.length()));
return new String(text);
StringgenerateStringFromCharacters(final Random random, final char[] validChars, final int min, final int max)
Generate a random string from an array of characters 
final int size = ThreadLocalRandom.current().nextInt(min, max + 1);
final char[] localPart = new char[size];
for (int i = 0; i < size; i++) {
    localPart[i] = validChars[random.nextInt(validChars.length - 1)];
return new String(localPart);
StringgenRandomString()
gen Random String 
int len = getRandomInt(23) + 1;
List<Integer> asciiBase = Arrays.asList(65, 97);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i++) {
    int randChar = getRandomInt(26);
    sb.append(Character.toChars(randChar + asciiBase.get(getRandomInt(asciiBase.size()))));
return sb.toString();
...
intget_a_number_between_min_and_max(int min, int max)
genumbebetweemianmax 
return java.util.concurrent.ThreadLocalRandom.current().nextInt(min, max + 1);
booleangetBoolean()
get Boolean 
return ThreadLocalRandom.current().nextBoolean();
booleangetElement(boolean[] array)
get Element 
return array[getInt(array.length)];
intgetInt(int bound)
get Int 
return ThreadLocalRandom.current().nextInt(bound);
StringgetLetter()
get Letter 
String[] let = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r",
        "s", "t", "u", "v", "w", "x" + "y" + "z" };
letter = let[ThreadLocalRandom.current().nextInt(let.length)];
return letter;
ThreadLocalRandomgetRandom()
get Random 
return ThreadLocalRandom.current();
intgetRandom(int p)
Generator an random int by 10^(p-1) Use nextInt(int origin, int bound) in JDK 1.7 
if (p <= 0 && p > 9)
    return -1;
return ThreadLocalRandom.current().nextInt((int) Math.pow(10, p - 1), (int) Math.pow(10, p) - 1);