Java Utililty Methods Collection Null

List of utility methods to do Collection Null

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Description

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

Method

CollectionnullSafe(Collection in)
null Safe 
if (in == null) {
    return (Collection<T>) EMPTY_LIST;
return in;
CollectionnullSafeCollection(Collection source)
null Safe Collection 
return source == null ? Collections.emptyList() : source;
intnullSafeSize(Collection collection)
size 
if (collection == null) {
    return 0;
return collection.size();
intnullSafeSize(final Collection collection)
null Safe Size 
return nullSafeSize(collection, 0);
voidpadWithNulls(final Collection s1, final Collection s2)
pad With Nulls 
if (s1.size() != s2.size()) {
    while (s1.size() < s2.size()) {
        s1.add(null);
    while (s1.size() > s2.size()) {
        s2.add(null);
booleanremoveAllIfNotNull(final Collection collection, final Collection c)
remove All If Not Null 
return (collection != null) && (c != null) && collection.removeAll(c);
booleanremoveNull(Collection collection)
remove Null 
return collection.removeAll(Collections.singleton(null));
voidremoveNull(final Collection c)
remove Null 
synchronized (c) {
    for (final Iterator<?> it = c.iterator(); it.hasNext();) {
        final Object object = it.next();
        if (object == null) {
            it.remove();
CollectionremoveNullElement(Collection collection)
remove Null Element 
Collection<T> result = new ArrayList<T>();
for (T t : collection) {
    if (t != null) {
        result.add(t);
return result;
booleanremoveNulls(Collection p_collection)
Removes null objects from the Collection. 
if (p_collection == null) {
    return false;
boolean removed = false;
Iterator it = p_collection.iterator();
while (it.hasNext()) {
    Object o = it.next();
    if (o == null) {
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