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

doublerandomScalingFactor()
random Scaling Factor 
return (double) (Math.random() > 0.5 ? 1.0 : -1.0) * Math.round(Math.random() * 100);
intrandomSeed()
Returns a a big random Integer to be used as a seed 
return (int) (Math.random() * Integer.MAX_VALUE);
shortrandomShort()
Generates a random word, manipulating an internal seed which is initially set to the system time. 
if (rand == 0) {
    seed ^= seed << 21;
    seed ^= seed >>> 35;
    seed ^= seed << 4;
    rand = seed;
final short s = (short) (rand & 0xffffL);
rand >>>= 16;
...
intrandomSign()
Used to get a random -1 or 1 to create numbers with random sign. 
return (random.nextInt(2) << 1) - 1;
StringrandomSimpleId()
random Simple Id 
return System.currentTimeMillis() + "-" + System.nanoTime();
voidrandomSleep()
random Sleep 
try { 
    Thread.sleep((long) Math.abs(Math.random() * 1000));
} catch (InterruptedException e) {
    e.printStackTrace();
StringrandomStateAbbr()
random State Abbr 
return STATES_ABBR[(int) (Math.random() * (STATES_ABBR.length - 1))];
byte[]randomStr(Random rnd, int size)
random Str 
return randomStr(rnd, null, size, size);
voidrandomSubList(List list, int sizeOfSubList)
Using like subList() but it take randoms elements. 
List<E> subList = Collections.emptyList();
if (isNotEmpty(list) && list.size() > sizeOfSubList) {
    subList = new ArrayList<E>(sizeOfSubList);
    Random generator = new Random();
    for (int i = 0; i < sizeOfSubList; i++) {
        int random = generator.nextInt(list.size());
        subList.add(list.get(random));
        list.remove(random);
...
booleanrandomSuccess()
random Success 
int x = (int) (Math.random() * 100);
return x > 10;