Java Utililty Methods List Add Unique

List of utility methods to do List Add Unique

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Description

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

Method

booleanaddUniq(List list, Object object)
add Uniq 
if (!list.contains(object))
    return list.add(object);
return false;
voidaddUnique(java.util.List l, String e)
add Unique 
if (!l.contains(e)) {
    l.add(e);
ListaddUnique(List aList, T anObj)
Adds an object to the given list if object is absent (creates list if missing). 
return contains(aList, anObj) ? aList : add(aList, anObj);
voidaddUnique(List list, T item)
add Unique 
if (isInList(list, item) == null) {
    list.add(item);
booleanaddUnique(List list, T item)
add Unique 
if (!list.contains(item)) {
    list.add(item);
    return true;
} else {
    return false;
ListaddUniqueId(List aList, T anObj)
Adds an object to the given list if identical object is missing (creates list if missing). 
return containsId(aList, anObj) ? aList : add(aList, anObj);
voidaddUniqueItems(List from, List to)
add Unique Items 
if (from == null || to == null || from.size() == 0) {
    return;
for (Iterator it = from.iterator(); it.hasNext();) {
    Object o = it.next();
    if (!to.contains(o)) {
        to.add(o);
voidaddUniqueValues(List source, List target)
Adds values from the source list to the target list only if they don't already exist in the target 
for (T item : source) {
    if (!target.contains(item)) {
        target.add(item);