Java Utililty Methods List Null Empty

List of utility methods to do List Null Empty

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Description

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

Method

ListemptyStringList()
empty String List 
return new ArrayList<String>();
ListemptyToNull(List list)
empty To Null 
if (isEmpty(list)) {
    return null;
return list;
ListemptyToNull(List list)
empty To Null 
return list == null ? null : (list.isEmpty() ? null : list);
booleanequalsEmptyEqNull(List list1, List list2)
equals Empty Eq Null 
if ((list1 == null || list1.isEmpty()) && (list2 == null || list2.isEmpty())) {
    return true;
if (list1 == null || list2 == null) {
    return false;
for (int i = 0; i < list1.size(); i++) {
    if (!list1.get(i).equals(list2.get(i))) {
...
booleanequalsNullSafe(List list1, List list2)
equals Null Safe 
if (list1 == list2) {
    return true;
if (list1 == null) {
    return list2 == null;
if (list2 == null) {
    return list1 == null;
...
voidfillEmptyEntries(Iterable keys, Map> map)
Adds a references to the empty list for keys to the map that are currently not yet contained in this map. 
for (Long processId : keys) {
    if (!map.containsKey(processId)) {
        List<T> empty = Collections.emptyList();
        map.put(processId, empty);
voidfillNull(final List list, final int numElements)
fill Null 
if (numElements < list.size())
    return;
final int iterations = numElements - list.size();
for (int i = 0; i < iterations; i++) {
    list.add(null);
voidfillNull(List lst, int size)
fill Null 
for (int i = lst.size(); i < size; i++) {
    lst.add(null);
ListfillUpWithNulls(List list)
Expands an integer list to a size equal to its value range and adds null-value entries for every missing intermediate integer value. 
return fillUpWithNulls(list, null);
ListgetEmptyList(Class cls)
get Empty List 
return (List<T>) emptyList;