Java Utililty Methods Random Element

List of utility methods to do Random Element

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Random Element

Description

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

Method

return randomEle(list, list.size());

Byte randomElem(Random rand, Set partitions)
random Elem

int item = rand.nextInt(partitions.size());
int i = 0;
for (Byte obj : partitions) {
 if (i == item)
 return obj;
 i = i + 1;
return partitions.iterator().next();
...

E randomElement(Collection coll)
random Element

return randomElement(coll, new Random());

E randomElement(E[] array)
random Element

return array[randomPositiveInt() % array.length];

E randomElement(final Set set)
random Element

final int size = set.size();
final int index = RANDOM_GENERATOR.nextInt(size);
int i = 0;
for (final E element : set) {
 if (i == index) {
 return element;
 i++;
...

int randomElement(int[] anArray)
random Element

if (anArray.length == 0) {
 return 0;
return anArray[nextInt(anArray.length)];

T randomElement(List list)
Selects a random element from a list.

if (list.isEmpty())
 throw new IllegalArgumentException("Can't select random element from an empty list.");
return list.get(random.get().nextInt(list.size()));

T randomElement(T... values)
random Element

if (values.length == 0)
 throw new IllegalArgumentException("Cannot choose random value from an empty array");
return values[random.nextInt(values.length)];

T randomElement(T[] array)
Picks a random element out of any array type.

return array[(int) (RANDOM.nextDouble() * array.length)];

T randomElementOf(final List list)
Get a random element from the list.

if (list.isEmpty()) {
 return null;
return list.get(nextInt(0, list.size()));