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

ListnewListIfNull(List list)
new List If Null 
if (list == null) {
    return new ArrayList<T>();
} else {
    return list;
ListnewListWhenNull(List list)
new List When Null 
if (isEmpty(list)) {
    list = new ArrayList<T>();
return list;
ArrayListnewListWithOneNull()
new List With One Null 
ArrayList<T> newList = new ArrayList<T>();
newList.add(null);
return newList;
booleannullOrEmpty(List s)
Check if List is null or empty 
return s == null || s.isEmpty();
booleannullOrEmptyList(List list)
Determine if a List is null or empty. 
return (list == null) || list.isEmpty();
voidnullSafeAdd(List list, T elem)
null Safe Add 
if (list != null) {
    list.add(elem);
ListnullsafeAsList(T... elements)
nullsafe As List 
return elements == null ? null : Arrays.asList(elements);
ListnullSafeList(List list)
Always returns a non-null list - either the argument list or a new empty list. 
return list != null ? list : Collections.<O>emptyList();
ListnullToEmpty(List in)
null To Empty 
return in == null ? Collections.<T>emptyList() : in;
ListnullToEmpty(List list)
null To Empty 
return list == null ? Collections.emptyList() : list;