Java Utililty Methods Collection Add

List of utility methods to do Collection Add

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Description

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

Method

voidaddNonNull(Object element, Collection result)
add Non Null 
if (element != null) {
    result.add(element);
voidaddNonnullIfMissing(Collection collection, T element)
Adds an element to a collection only if the latter does not contain it and the element is not null. 
if (collection == null)
    throw new IllegalArgumentException();
if (element != null && !collection.contains(element)) {
    collection.add(element);
CollectionaddNonNulls(Collection c, X... xl)
add those elements which are not null to the given collection and return it 
for (X x : xl) {
    if (x != null)
        c.add(x);
return c;
voidaddNotNull(Collection col, String toAdd)
add Not Null 
if (toAdd != null && toAdd.length() > 0 && !col.contains(toAdd.trim())) {
    col.add(toAdd.trim());
voidaddOneValueUNSAFE(Collection cloneCollection, Object v)
add One Value UNSAFE 
cloneCollection.add(v);
CollectionaddPrefix(Collection values, String prefix)
add Prefix 
Collection<String> newValues = new ArrayList<String>();
for (String value : values) {
    newValues.add(prefix + value);
return newValues;
voidaddPreviousTags(int index, String[] prevTags, int prevTagsToAdd, Collection targetCol)
add Previous Tags 
if (prevTags == null) {
    prevTags = EMPTY_STRING_ARRAY;
if (index - 1 >= prevTags.length) {
    throw new IllegalStateException();
for (int pt = 1; pt <= prevTagsToAdd; pt++) {
    int t = index - pt;
...
voidaddRange(Collection c, int start, int to, int step)
Adds values into the given collection using integer in the specified range and step size. 
if (step <= 0)
    throw new RuntimeException("Would create an infinite loop");
for (int i = start; i < to; i += step)
    c.add(i);
booleanaddSafe(final Collection collection, T element)
Similar to Collection.add() but only allows non-null elements. 
if (element != null) {
    return collection.add(element);
} else {
    return false;
TaddTo(Collection l, Object... os)
add To 
Collections.addAll(l, os);
return (T) l;