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

booleanremoveObject(Object item, Iterator iter, boolean justFirst)
Removes a specified object using an iterator. 
boolean modified = false;
while (iter.hasNext()) {
    Object o = iter.next();
    if (item == null && o == null) {
        iter.remove();
        if (justFirst)
            return true;
        if (!modified)
...
IteratorremoveOnNext(final Iterator iterator)
remove On Next 
return new Iterator<T>() {
    @Override
    public boolean hasNext() {
        return iterator.hasNext();
    @Override
    public void remove() {
        iterator.remove();
...
booleanremoveValue(List args, int idx, Iterator it)
remove Value 
if (args.size() > idx) {
    final String nextArg = args.get(idx);
    if (!nextArg.startsWith("-")) {
        it.next();
        it.remove();
        return true;
return false;
EretrieveFirstAndExhaustIterator(Iterator iterator)
Returns the first element and exhausts an iterator 
E returnVal = null;
if (iterator.hasNext()) {
    returnVal = iterator.next();
exhaustIterator(iterator);
return returnVal;
TsafeAdvance(Iterator iterator)
safe Advance 
return iterator.hasNext() ? iterator.next() : null;
intsearchIndexInIterator(Iterator iterator, T value)
search Index In Iterator 
return searchIndexInIterator(iterator, value, 0);
IterableshallowUnionColIter(Iterator> values)
shallow Union Col Iter 
return () -> multiIterator(values);
Tsingle(Iterator i)
single 
if (i.hasNext()) {
    return i.next();
return null;
IteratorsingleElementIterator(T element)
single Element Iterator 
return Arrays.asList(element).iterator();
TsingleOrDefault(Iterator iterator)
single Or Default 
if (!iterator.hasNext()) {
    return null;
T first = iterator.next();
if (iterator.hasNext()) {
    throw new IllegalStateException("Expected single result, but got more than one");
return first;
...