Java Utililty Methods List Create

List of utility methods to do List Create

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List Create

Description

The list of methods to do List Create are organized into topic(s).

Method

if (items == null) {
 return null;
if (items instanceof List) {
 return (List<T>) items;
return new ArrayList<T>(items);

List asList(E... elements)
as List

if (elements == null || elements.length == 0) {
 return Collections.emptyList();
int capacity = computeListCapacity(elements.length);
ArrayList<E> list = new ArrayList<E>(capacity);
Collections.addAll(list, elements);
return list;

List asList(E[] array)
as List

if (isEmpty(array)) {
 return new ArrayList<>();
return Arrays.asList(array);

List asList(final int... values)
Returns a List List<Integer> representation of an primitive int array.

if (values == null)
 throw new IllegalArgumentException("the input array cannot be null");
return new AbstractList<Integer>() {
 @Override
 public Integer get(final int index) {
 return values[index];
 @Override
...

ArrayList asList(final Iterator data)
Returns data converted into list.

final ArrayList<T> list = new ArrayList<T>();
while (data.hasNext()) {
 list.add(data.next());
return list;

ArrayList asList(int[] a)
as List

ArrayList list = new ArrayList(a.length);
for (int i = 0; i < a.length; i++) {
 list.add(new Integer(a[i]));
return list;

List asList(int[] array)
needed because Arrays.asList() won't to autoboxing, so if you give it a primitive array you get a singleton list back with just that array as an element.

List<Integer> l = new ArrayList<>();
for (int i : array) {
 l.add(i);
return l;

List asList(Iterable iteratable)
as List

return asList(iteratable, new ArrayList<>());

Collection asList(Object[] array)
as List

Collection result = new ArrayList(array.length);
for (int i = 0; i < array.length; i++) {
 result.add(array[i]);
return result;

List asList(Object[] array)
Returns the list view of given array or null if array is null.

return array == null ? null : Arrays.asList(array);