Java Utililty Methods Collection Reverse

List of utility methods to do Collection Reverse

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Collection Reverse

Description

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

Method

Collection reverse(Collection collection)
reverse

LinkedList newCollection = new LinkedList();
Iterator i = collection.iterator();
while (i.hasNext()) {
 newCollection.addFirst(i.next());
return newCollection;

Collection reverse(Collection c)
reverse

Object[] reverse = new Object[c.size()];
int index = c.size();
for (E e : c) {
 reverse[--index] = e;
return (List<E>) Arrays.asList(reverse);

List reverse(Collection input)
reverse

List<T> output = new ArrayList<>(input);
Collections.reverse(output);
return output;

Map> reverseMap(Map> input)
reverse Map

Map<T, HashSet<T>> ret = new HashMap<T, HashSet<T>>();
for (Map.Entry<T, ? extends Collection<T>> entry : input.entrySet()) {
 final Collection<T> values = entry.getValue();
 final T key = entry.getKey();
 for (T value : values) {
 HashSet<T> newValues = ret.get(value);
 if (newValues == null) {
 newValues = new HashSet<T>();
...

Collection reverseOrder(Collection objects)
reverse Order

Object[] reversed = new Object[objects.size()];
Iterator<K> iter = objects.iterator();
int i = objects.size() - 1;
while (iter.hasNext()) {
 reversed[i] = iter.next();
 i--;
Collection<K> reversedCollection = new ArrayList<K>();
...