Java Utililty Methods Collection to Array

double[] result = new double[values.size()];
int i = 0;
for (Double value : values) {
    result[i] = value;
    i++;
return result;

if (values == null) {
    throw new IllegalArgumentException("No null value allowed!");
double[] result = new double[values.size()];
int cnt = 0;
for (Double value : values) {
    result[cnt++] = value;
return result;

if (collection.isEmpty())
    return EMPTY_ARRAY;
int[] array = new int[collection.size()];
Iterator<Integer> iterator = collection.iterator();
for (int n = 0; iterator.hasNext(); ++n)
    array[n] = iterator.next().intValue();
return array;

int[] ar = new int[collection.size()];
int i = 0;
for (Integer t : collection) {
    ar[i++] = t;
return ar;

if (collection == null)
    return new long[0];
long[] ret = new long[collection.size()];
int count = 0;
for (Long element : collection) {
    if (element == null) {
        if (defaultValue == null)
            continue;
...

String[] array = new String[col.size()];
col.toArray(array);
return array;

Converts a collection of Strings into a Javascript array.

StringBuilder sb = new StringBuilder("[");
Iterator<String> it = collection.iterator();
while (it.hasNext()) {
    sb.append("'");
    sb.append(it.next());
    sb.append("'");
    if (it.hasNext()) {
        sb.append(",");
...

if (collection == null) {
    throw new IllegalArgumentException("argument must not be null.");
return collection.toArray(new String[collection.size()]);

return list.toArray(new String[list.size()]);

String[] sArray = new String[stringCollection.size()];
int i = 0;
for (Iterator<String> iterator = stringCollection.iterator(); iterator.hasNext();) {
    sArray[i] = (String) iterator.next();
    i++;
return sArray;