Java Utililty Methods Iterator

List of utility methods to do Iterator

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Description

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

Method

IteratorsingletonIterator(final Object item)
singleton Iterator 
return new Iterator() {
    private boolean gotItem = false;
    public boolean hasNext() {
        return !this.gotItem;
    public Object next() {
        if (this.gotItem) {
            throw new NoSuchElementException();
...
IteratorsingletonIterator(final T item)
Returns a singleton iterator with a single item. 
return new Iterator<T>() {
    private T _item = item;
    private boolean _hasItem = false;
    @Override
    public boolean hasNext() {
        return !_hasItem;
    @Override
...
IteratorsingletonIterator(final T nullableValue)
singleton Iterator 
if (nullableValue == null) {
    return (Iterator<T>) EMPTY_ITERATOR;
return new Iterator<T>() {
    boolean done;
    @Override
    public boolean hasNext() {
        return !done;
...
IteratorsingletonIterator(final T t)
singleton Iterator 
return Collections.singletonList(t).iterator();
intsize(Iterator iterator)
size 
int count = 0;
while (iterator.hasNext()) {
    iterator.next();
    count++;
return count;
voidsplice(LinkedList list, Iterator iterator, LinkedList list2, V v)
splice 
list2.remove(v);
assert (iterator.equals(list.iterator()));
list.addFirst(v);
Object[]toArray(final Iterator iterator)
to Array 
final List<Object> out = new ArrayList<Object>();
while (iterator.hasNext()) {
    out.add(iterator.next());
return out.toArray();
voidtoCollection(final Iterator iterator, final Collection c)
to Collection 
while (iterator.hasNext()) {
    c.add(iterator.next());
StringtoCommaSeparatedString(Iterator i)
to Comma Separated String 
StringBuilder sb = new StringBuilder();
for (; i.hasNext();) {
    sb.append(i.next().toString());
    if (i.hasNext() == true) {
        sb.append(", ");
return sb.toString();
...
IteratortoIterator(Collection col)
Get an iterator from a collection, returning null if collection is null 
if (col == null)
    return null;
else
    return col.iterator();