Java Utililty Methods Collection Copy

List of utility methods to do Collection Copy

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Description

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

Method

CollectioncopyStringCollection(Collection strings)
copy String Collection 
if (strings == null) {
    return null;
Collection<String> result = new ArrayList<String>(strings.size());
result.addAll(strings);
return result;
ArrayListcopyWithoutNull(Collection orig)
copy Without Null 
ArrayList<E> ret = new ArrayList<E>();
if (orig == null)
    return ret;
for (E e : orig) {
    if (e != null)
        ret.add(e);
return ret;
...
SetcreateSet(Collection toCopy)
create Set 
return new HashSet(toCopy);
CollectionmaskedCopyOf(final Collection source, final Collection mask)
masked Copy Of 
final Collection<T> copy = new LinkedList<T>(source);
copy.retainAll(new ArrayList<T>(mask));
return copy;
CollectionshallowCopy(Collection collection)
shallow Copy 
ArrayList<T> copied = new ArrayList<T>(collection.size());
for (T element : collection) {
    copied.add(element);
return copied;
ListtoUnmodifiableCopy(Collection collection)
to Unmodifiable Copy 
return Collections.unmodifiableList(new ArrayList<T>(collection));