Example usage for java.util Iterator next

Introduction

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

Prototype

E next();

Source Link

Document

Returns the next element in the iteration.

Usage

From source file:Main.java

/**
 * @param coll {@link Collection} any collection object containing zero or more elements,can't be null.
 * @return {@link Number} the maximum value available in the collection.
 *//*from w  w  w . j a v  a  2  s . co  m*/
public static Number max(Collection<? extends Number> coll) {
    Iterator<? extends Number> i = coll.iterator();
    Number candidate = i.next();
    while (i.hasNext()) {
        Number next = i.next();
        if (next.doubleValue() - candidate.doubleValue() > 0)
            candidate = next;
    }
    return candidate;
}

From source file:Main.java

/**
 * @throws IllegalArgumentException if an add operation "soft fails" (does not modify the collection)
 * @see Collection#addAll(Collection)//from   www. j a va2  s.  co m
 */
public static <E> void addAllForce(Collection<E> collection, Iterator<? extends E> add) {
    while (add.hasNext()) {
        E next = add.next();
        Preconditions.checkArgument(collection.add(next), "collection did not accept next element %s: %s", next,
                collection);
    }
}

From source file:Main.java

/**
 * Returns true if both collections contain the same elements and the elements are in the same order.
 * Note that the start elements do not have to be the equal!
 * @param s1 The first collection/* w  ww.j  a  v  a2 s.c  o  m*/
 * @param s2 The second collection
 * @return true if s1 and s2 are same in the sense explained above. 
 */
public static boolean sameElementsSameOrder(Collection<?> s1, Collection<?> s2) {
    if (s1.size() != s2.size())
        return false;

    Iterator<?> it1 = s1.iterator();
    Object first = it1.next();
    for (Iterator<?> it2 = s2.iterator(); it2.hasNext();) {
        if (it2.next().equals(first)) {
            while (it1.hasNext()) {
                if (!it2.hasNext())
                    it2 = s2.iterator();
                if (!it1.next().equals(it2.next()))
                    return false;
            }
            return true;
        }
    }
    return false;
}

From source file:Main.java

public static <E> E getElementAtIndex(Collection<E> set, int idx) {
    if (idx >= set.size() || idx < 0) {
        throw new IndexOutOfBoundsException();
    }//from w  w w .  jav a  2 s . c om
    Iterator<E> it = set.iterator();
    for (int i = 0; i < idx; ++i) {
        it.next();
    }
    return it.next();
}

From source file:Main.java

public static <T> T getFirst(Iterable<? extends T> iterable, T def) {
    final Iterator<? extends T> iter = iterable.iterator();
    return iter.hasNext() ? iter.next() : def;
}

From source file:com.apextom.util.CollectionUtil.java

/**
 * ? null .//from w  w  w.  j av a2s.  c  o  m
 * 
 * @param list
 */
public static void removeNull(Collection<Object> list) {
    if (list == null || list.size() == 0) {
        return;
    }
    Iterator<Object> iter = list.iterator();
    while (iter.hasNext()) {
        if (iter.next() == null) {
            iter.remove();
        }
    }

}

From source file:Main.java

public static List<String> removeIgnoreCase(List<String> l, String s) {
    Iterator<String> iter = l.iterator();
    while (iter.hasNext()) {
        if (iter.next().equalsIgnoreCase(s)) {
            iter.remove();/*ww  w .java 2 s . co  m*/
            break;
        }
    }
    return l;
}

From source file:Main.java

public static <T> T first(Collection<T> collection) {
    Iterator<T> iterator = collection.iterator();
    return iterator.hasNext() ? iterator.next() : null;
}

From source file:Main.java

public static <T> T getAt(Collection<T> col, int index) {
    if (col instanceof List)
        return ((List<T>) col).get(index);
    int i;/*from   w w  w .  j  a  v a2  s  .co m*/
    Iterator<T> it;
    for (i = 0, it = col.iterator(); i < index && it.hasNext(); it.next())
        ;
    return it.hasNext() ? it.next() : null;
}

From source file:Main.java

public static String getClasspathString(List<File> c) {
    StringBuilder sb = new StringBuilder();
    Iterator<File> i = c.iterator();
    if (i.hasNext()) {
        sb.append(i.next().getAbsolutePath());
        while (i.hasNext()) {
            sb.append(File.pathSeparatorChar);
            sb.append(i.next().getAbsolutePath());
        }//from   w w  w  . j a  v a2  s.  co  m
    }
    return sb.toString();
}