Example usage for java.util Iterator hasNext

Introduction

In this page you can find the example usage for java.util Iterator hasNext.

Prototype

boolean hasNext();

Source Link

Document

Returns true if the iteration has more elements.

Usage

From source file:Main.java

public static Optional<XMLEvent> getStartElement(List<XMLEvent> events, String elementName) {
    Iterator<XMLEvent> iterator = events.iterator();

    while (iterator.hasNext()) {
        XMLEvent event = iterator.next();

        if (event.isStartElement() && event.asStartElement().getName().getLocalPart().equals(elementName))
            return Optional.of(event);

    }/*  w  ww  .ja v a2 s .  c om*/

    return Optional.empty();
}

From source file:Main.java

public static <T> T getSingleIfExist(Iterable<T> iterable) {
    if (iterable == null)
        return null;
    final Iterator<? extends T> iter = iterable.iterator();
    if (!iter.hasNext())
        return null;
    final T result = iter.next();
    if (iter.hasNext()) {
        throw new IllegalArgumentException("More than (expected) one element in " + iterable);
    }//ww  w  .  j av  a  2  s  .c om
    return result;
}

From source file:Main.java

public static <T> Map<T, Integer> getCardinalityMap(final Collection<T> coll) {
    if (coll == null) {
        return null;
    }//from   w  ww .  j a v  a 2s  . c  o  m

    Map<T, Integer> result = new HashMap<T, Integer>();
    Iterator<T> it = coll.iterator();
    while (it.hasNext()) {
        T t = it.next();
        Integer count = result.get(t);
        if (count == null) {
            result.put(t, ONE);
        } else {
            result.put(t, new Integer(count.intValue() + 1));
        }
    }
    return result;
}

From source file:Main.java

public static <E> List<E> iteratorToList(Iterator<E> iterator) {
    List<E> list = new ArrayList<E>();
    while (iterator.hasNext()) {
        list.add(iterator.next());//from ww  w  . ja va  2 s.c om
    }
    return list;
}

From source file:Main.java

public static Object findObject(Collection<?> c, Object o, Comparator cmp) {
    if (c != null && o != null && cmp != null) {
        Iterator<?> it = c.iterator();
        while (it.hasNext()) {
            Object current = it.next();
            if (o.getClass().equals(current.getClass())) {
                if (cmp.compare(current, o) == 0) {
                    return current;
                }//ww w  .ja  v  a 2s . co  m
            }
        }
    }
    return null;
}

From source file:Main.java

public static <K> boolean isEquals(Collection<K> collection1, Collection<K> collection2) {

    if (collection1 == null && collection2 == null) {
        return true;
    }//from w w  w  .  ja  v  a2s .c om
    if (collection1 == null || collection2 == null || collection1.size() != collection2.size()) {
        return false;
    }
    boolean result = true;
    Iterator<K> ite2 = collection2.iterator();
    while (ite2.hasNext()) {
        if (!collection1.contains(ite2.next())) {
            result = false;
            break;
        }
    }
    return result;
}

From source file:Main.java

public static final <K, V> void printM(Map<K, V> map, String sep) {
    Iterator<Entry<K, V>> it = map.entrySet().iterator();
    while (it.hasNext()) {
        Entry<K, V> e = it.next();
        System.out.append(e.getKey().toString()).append("::").append(e.getValue().toString());
        if (it.hasNext()) {
            System.out.append(sep);
        }/*  w  ww .  j av a 2  s .  co m*/
    }

}

From source file:Main.java

public static int GetIndexFromCollectionUsingID(ArrayList list, String value) {
    Iterator Item = list.iterator();
    int index = -1;
    while (Item.hasNext()) {
        index++;// w w  w. j a  v  a  2  s.com
        if (Item.next().toString().contains(value + " :"))
            return index;

    }
    return -1;
}

From source file:Main.java

public static int GetIndexFromCollection(ArrayList list, String value) {
    Iterator Item = list.iterator();
    int index = -1;
    while (Item.hasNext()) {
        index++;//w  w w. jav  a2 s .  c o  m
        if (Item.next().toString().equalsIgnoreCase(value))
            return index;

    }
    return -1;
}

From source file:Main.java

public static <T> Optional<T> findAnyIn(Collection<T> collection) {
    final Iterator<T> iterator = collection.iterator();
    if (iterator.hasNext()) {
        return Optional.of(iterator.next());
    }//from  w  w  w.  java 2  s  .  co m
    return Optional.empty();
}