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

booleanisNullOrEmpty(List l)
is Null Or Empty 
if (l == null) {
    return true;
if (l.isEmpty()) {
    return true;
return false;
booleanisNullOrEmptyAwareEqual(final List targetOne, final List targetTwo)
Check if either both objects are null or List#isEmpty() empty . 
final boolean checkResult;
if (targetOne == null || targetOne.isEmpty()) {
    checkResult = targetTwo == null || targetTwo.isEmpty();
} else {
    checkResult = targetOne.equals(targetTwo);
return checkResult;
booleanisNullOrEmptyList(final List list)
is Null Or Empty List 
return list == null || list.size() == 0;
voidisNullOrEmptyList(List list)
is Null Or Empty List 
isNullOrEmptyList(list, "[Assertion failed] - this list is empty or null");
voidisNullOrEmptyList(String message, List list)
is Null Or Empty List 
if ((null == list) || (list.isEmpty())) {
    throw new IllegalArgumentException(message);
booleanisObjectListEmpty(List list)
This method returns true if the input list is null or list is empty. 
return (list == null || list.isEmpty());
TlistToItemOrNull(List list)
Transforms a list to a single item or to a null if the list has no item. 
if (list == null) {
    return null;
} else {
    switch (list.size()) {
    case 0:
        return null;
    case 1:
        return list.get(0);
...
ListlistWithoutNull(A... elements)
list Without Null 
List<A> list = new ArrayList<A>();
for (A a : elements) {
    if (a != null)
        list.add(a);
return list;
ListlistWithoutNull(final List list)
Return a list without null elements. 
if (list == null) {
    return null;
final List<E> result = new ArrayList<>();
for (E e : list) {
    if (e != null) {
        result.add(e);
return result;
ListmaskNull(List pTypes)
mask Null 
return (pTypes == null) ? Collections.<String>emptyList() : pTypes;