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

doublerandomInRange(double min, double max)
random In Range 
double range = max - min;
double scaled = random.nextDouble() * range;
return scaled + min;
IteratorrandomInsults()
random Insults 
return randomInsults(42);
int[]randomIntArray(int len, Random rand)
random Int Array 
int[] out = new int[len];
for (int i = 0; i < len; i++) {
    out[i] = rand.nextInt();
    if (out[i] < 0)
        out[i] = -out[i];
return out;
ListrandomIntegerList(int sz, int min, int max)
random Integer List 
List<Integer> lst = new ArrayList<>(sz);
for (int i = 0; i < sz; i++)
    lst.add(randInt(min, max));
return lst;
ListrandomIntegers(int sz)
random Integers 
List<Integer> lst = new ArrayList<>();
Random rand = new Random();
for (int i = 0; i < sz; i++) {
    lst.add(rand.nextInt(sz * 10));
return lst;
IterablerandomIterable(Collection col)
Takes given collection, shuffles it and returns iterable instance. 
List<T> list = new ArrayList<>(col);
Collections.shuffle(list);
return list;
StringrandomKey()
random Key 
byte[] key = new byte[16];
for (int i = 0; i < 16; i++) {
    key[i] = (byte) (-128 + (int) (Math.random() * ((127 - -128) + 1)));
return new String(key);
StringrandomKey()
Method to generate random key 
return Long.toHexString(Double.doubleToLongBits(Math.random()));
charrandomLetter()
random Letter 
return letters[rand.nextInt(letters.length)];
ListrandomList(Collection collection)
random List 
List<E> list = new ArrayList<>(collection);
Collections.shuffle(list);
return list;