Java Utililty Methods List Create

List of utility methods to do List Create

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Description

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

Method

ListasList(Collection items)
as List 
if (items == null) {
    return null;
if (items instanceof List) {
    return (List<T>) items;
return new ArrayList<T>(items);
ListasList(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;
ListasList(E[] array)
as List 
if (isEmpty(array)) {
    return new ArrayList<>();
return Arrays.asList(array);
ListasList(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
...
ArrayListasList(final Iterator data)
Returns data converted into list. 
final ArrayList<T> list = new ArrayList<T>();
while (data.hasNext()) {
    list.add(data.next());
return list;
ArrayListasList(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;
ListasList(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;
ListasList(Iterable iteratable)
as List 
return asList(iteratable, new ArrayList<>());
CollectionasList(Object[] array)
as List 
Collection result = new ArrayList(array.length);
for (int i = 0; i < array.length; i++) {
    result.add(array[i]);
return result;
ListasList(Object[] array)
Returns the list view of given array or null if array is null. 
return array == null ? null : Arrays.asList(array);