Java Utililty Methods Iterator from

List of utility methods to do Iterator from

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Description

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

Method

TgetIndexInIterator(Iterator iterator, int index)
get Index In Iterator 
for (int i = 0; iterator.hasNext(); i++) {
    T current = iterator.next();
    if (i == index) {
        return current;
return null;
IterablegetIterable(final Iterator i)
Wraps iterator into iterable 
return new Iterable<T>() {
    @Override
    public Iterator<T> iterator() {
        return i;
};
IteratorgetIterator(final int[] p, final Object[] data)
Answer iterator, which iterates over specified data array according to the specified permutation, that is data[p[0]],..,data[p[data.length-1]] 
return new Iterator() {
    int pos = 0;
    public boolean hasNext() {
        return pos < data.length;
    public Object next() {
        return data[p[pos++]];
    public void remove() {
        throw new UnsupportedOperationException("Cannot remove from immutable iterator!");
};
IteratorgetIterator(final Object o, final Class classElement)
Cast an object into a typed iterator. 
final List<T> list = new ArrayList<>();
if (o != null && classElement != null && Iterator.class.isAssignableFrom(o.getClass())) {
    Iterator<?> mObj = (Iterator<?>) o;
    while (mObj.hasNext()) {
        Object obj = mObj.next();
        if (obj == null) {
            list.add(null);
        } else if (classElement.isAssignableFrom(obj.getClass())) {
...
IteratorgetIterator(List list)
get Iterator 
Iterator i = list.iterator();
return i;
IteratorgetIterator(T[] array)
Construct an iterator from an array. 
return Arrays.asList(array).iterator();
StringgetIteratorAsString(Iterator iter, final String separator)
Returns a string containing all entries found. 
StringBuffer buf = new StringBuffer();
boolean isFirst = true;
while (iter.hasNext()) {
    if (isFirst)
        isFirst = false;
    else
        buf.append(separator);
    buf.append(iter.next());
...
StringgetIteratorOptionalValue(final Iterator stringIterator)
get Iterator Optional Value 
return stringIterator.hasNext() ? stringIterator.next() : "";
TgetLast(Iterator iterator)
get Last 
T last = null;
while (iterator.hasNext()) {
    last = iterator.next();
return last;
ListgetList(Iterator iterator)
Creates a list of all of the items in an iteration. 
List<String> contents = new ArrayList<String>();
while (iterator.hasNext()) {
    contents.add(iterator.next());
return contents;