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

intgetRandom8()
Generator an random int in 10^7 ~ 10^8
Use nextInt(int origin, int bound) in JDK 1.7 
return ThreadLocalRandom.current().nextInt(10_000_000, 99_000_000);
intgetRandomBetween(int min, int max)
get Random Between 
Preconditions.checkArgument(max > min);
return ThreadLocalRandom.current().nextInt(max - min) + min;
intgetRandomBoundedInt(int bound)
bound is exclusive 
return ThreadLocalRandom.current().nextInt(bound);
doublegetRandomDouble(double a, double b)
get Random Double 
if (a == b)
    return a;
return ThreadLocalRandom.current().nextDouble(a, b);
EgetRandomElement(E[] array)
get Random Element 
return array[getRandomInt(array.length)];
TgetRandomElement(List elements)
get Random Element 
int size = elements.size();
if (size > 0) {
    return elements.get(ThreadLocalRandom.current().nextInt(size));
} else {
    return null;
floatgetRandomFloat()
returns (.nextFloat() * 10 ) * (1/2 chance of *= -1) 
float randomFloat = ThreadLocalRandom.current().nextFloat() * 10;
float coinFlip = ThreadLocalRandom.current().nextInt(2);
if (coinFlip > 0) {
    randomFloat *= -1;
return randomFloat;
StringgetRandomId(@Nonnull Random random, int length)
get Random Id 
final char[] buf = new char[length];
for (int i = 0; i < length; ++i) {
    buf[i] = RANDOM_ID_CHARS[random.nextInt(RANDOM_ID_CHARS.length)];
return new String(buf);
intgetRandomInt()
get Random Int 
return RANDOM.nextInt();
intgetRandomInt(int a, int b)
get Random Int 
if (a == b)
    return a;
if (a > b)
    return ThreadLocalRandom.current().nextInt(b, a);
return ThreadLocalRandom.current().nextInt(a, b);