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 int cardinality(java.lang.Object obj, Collection coll) {
    int numObject = 0;
    if (coll != null) {
        Iterator iter = coll.iterator();

        while (iter.hasNext()) {
            Object collObj = iter.next();

            if (collObj != null) {
                if (collObj.equals(obj)) {
                    numObject++;// w  w w  . j  a  v a  2  s . co  m
                }
            }

        }
    }
    return numObject;
}

From source file:Main.java

/**
 * From http://stackoverflow.com/questions/3047051/how-to-determine-if-a-list-is-sorted-in-java
 * @param iterable/*w w w.  jav a  2  s .  c  o m*/
 * @param <T>
 * @return
 */
public static <T extends Comparable<? super T>> boolean isSorted(Iterable<T> iterable) {
    Iterator<T> iter = iterable.iterator();
    if (!iter.hasNext()) {
        return true;
    }
    T t = iter.next();
    while (iter.hasNext()) {
        T t2 = iter.next();
        if (t.compareTo(t2) > 0) {
            return false;
        }
        t = t2;
    }
    return true;
}

From source file:Main.java

/**
 * Joins the {@link String} representation of elements of a given list,
 * dividing with a separator.//from   w  w  w  .ja  v  a2 s . c o  m
 * 
 * @param input
 *            - the {@link List} of elements to join.
 * @param separator
 *            - the separator to place between elements
 * @return - the joined {@link String}
 */
public static <E extends Object> String join(List<E> input, String separator) {
    StringBuilder result = new StringBuilder();
    Iterator<E> it = input.iterator();

    while (it.hasNext()) {
        result.append(it.next());
        if (separator != null && it.hasNext()) {
            result.append(separator);
        }
    }

    return result.toString();
}

From source file:Main.java

/**
 * Append a collection of strings and delimiter.
 *
 * @param c A collection of strings.// w  w  w .java2  s  .  c o  m
 * @param delimiter A delimiter string.
 * @return The new string.
 */
public static String join(Collection<String> c, String delimiter) {
    if (c == null || delimiter == null) {
        throw new IllegalArgumentException("Collections and delimiters given to join cannot be null!");
    }
    StringBuilder builder = new StringBuilder("");
    Iterator<String> iter = c.iterator();
    while (iter.hasNext()) {
        builder.append(iter.next());
        if (iter.hasNext()) {
            builder.append(delimiter);
        }
    }
    return builder.toString();
}

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:Main.java

/**
 * Returns an arbitrary element from the given collection.
 * //  w ww .  j  ava2 s  . c om
 * @param collection
 *        to retrieve the element from
 * @return an arbitrary element or <tt>null</tt> if the collection is empty
 */
public static <T> T getAny(final Collection<T> collection) {
    final Iterator<T> iterator = collection.iterator();
    if (iterator.hasNext()) {
        return iterator.next();
    }

    return null;
}

From source file:Main.java

public static <E> E getOnlyElement(Iterable<E> iterable) {
    Iterator<E> iterator = iterable.iterator();

    if (!iterator.hasNext()) {
        throw new RuntimeException("Collection is empty");
    }/*w  ww .  java  2  s.  c  o m*/

    E element = iterator.next();

    if (iterator.hasNext()) {
        throw new RuntimeException("Collection contains more than one item");
    }

    return element;
}

From source file:Main.java

public static boolean hasValue(Map<?, ?> map, String key, String val) {
    if (map == null) {
        return false;
    }/*from   ww  w  .  j a  v a2 s  . com*/
    Collection<?> col = (Collection<?>) map.get(key);
    if (col == null) {
        return false;
    }
    Iterator<?> itr = col.iterator();
    while (itr.hasNext()) {
        String str = (String) itr.next();
        if (str.equalsIgnoreCase(val)) {
            return true;
        }
        if (str.toLowerCase().startsWith(val)) {
            return true;
        }
    }
    return false;
}

From source file:Main.java

public static double calcStrSetSimilarity(final Set<String> strASet1, final Set<String> strASet2) {
    int containsCount = 0;
    final Iterator<String> iter = strASet2.iterator();
    while (iter.hasNext()) {
        if (strASet1.contains(iter.next())) {
            containsCount++;//from ww w. j  a va2 s  .c  o m
        }
    }
    return (double) containsCount / (double) strASet1.size();
}

From source file:Main.java

public static <T> List<T> search(final String str, Collection<? extends T> coll, Comparable<? super T> comp) {
    if (comp == null)
        return null;
    List<T> list = new ArrayList<T>();
    Iterator<? extends T> i = coll.iterator();
    while (i.hasNext()) {
        T next = i.next();// w  ww. j av a 2 s  .  c om
        if (comp.compareTo(next) > 0) {
            list.add(next);
        }
    }
    return list;
}