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 <T> Collection<? extends T> split(Collection<? extends T> d, int n) {
    Collection<T> tmp = new ArrayList<>();
    Iterator it = d.iterator();
    int k = Math.max(0, n);
    while (it.hasNext() && k > 0) {
        tmp.add((T) it.next());/*from w w  w . j  av  a2s  .  c  o m*/
        k--;
    }
    return tmp;
}

From source file:Main.java

/**
 * HashMap Operations/*from  ww w.j a v a2  s.c  o m*/
 * */
public static void printHash(HashMap<String, Integer> hashMap) {
    System.out.println("Print HashMap");
    Set<Map.Entry<String, Integer>> s = hashMap.entrySet();
    Iterator<Map.Entry<String, Integer>> it = s.iterator();
    while (it.hasNext()) {
        Map.Entry<String, Integer> m = (Map.Entry<String, Integer>) it.next();
        System.out.println(m.getKey() + "\t" + m.getValue());
    }
}

From source file:Main.java

/**
 * Returns a String representation of the elements delimited with the specified delimiter 
 * //from   ww w . j  av a2 s.  com
 * @param elements the elements to build the String out of
 * @param delimiter the specified delimiter
 * @return the delimited String
 */
public static <T> String asDelimitedString(Collection<T> elements, String delimiter) {
    StringBuilder sb = new StringBuilder();
    Iterator<T> iterator = elements.iterator();
    while (iterator.hasNext()) {
        sb.append(iterator.next().toString());
        sb.append(iterator.hasNext() ? delimiter : EMPTY_STRING);
    }
    return sb.toString();
}

From source file:Main.java

public static <E> E first(Collection<E> collection) {

    if (isEmpty(collection)) {
        return null;
    }//  ww w  .ja  v a  2s. c  om

    Iterator<E> iterator = collection.iterator();

    if (iterator.hasNext()) {
        return iterator.next();
    }

    throw new IllegalStateException("Should not happen");
}

From source file:Main.java

public static <T> Collection<T> reverse(final Collection<T> collection) {
    final LinkedList<T> newCollection = new LinkedList<>();
    final Iterator<T> i = collection.iterator();
    while (i.hasNext()) {
        newCollection.addFirst(i.next());
    }/* ww  w  . j  a  v  a 2  s. co  m*/
    return newCollection;
}

From source file:Main.java

private static <T extends Comparable<T>> T getExtremum(Collection<T> vals, int comparator) {
    if (vals.size() == 0)
        return null;
    Iterator<T> it = vals.iterator();
    T ret = it.next();//from  ww  w  .ja va  2s  .  c  o  m
    while (it.hasNext()) {
        T v = it.next();
        if (v.compareTo(ret) * comparator > 0)
            ret = v;
    }
    return ret;
}

From source file:Main.java

/**
 * Returns the first object of given type or its subtypes
 * @param clazz The class you want to return the first instance found of.
 * @param objects The collection you'd like to search.
 * @return The first instance of a specific Class found in a Collection.  Returns null if no instance is found.
 *///from   ww  w . j av  a  2s. c om
public static Object getFirstInstance(Class clazz, Collection objects) {
    if (objects != null && clazz != null) {
        Iterator objectsIterator = objects.iterator();
        while (objectsIterator.hasNext()) {
            Object instance = objectsIterator.next();
            if (clazz.isAssignableFrom(instance.getClass())) {
                return instance;
            }
        }
    }
    return null;
}

From source file:Main.java

/**
 * patterns: ["/util//note"]//from w  w  w  .j  a  va  2s  .  c o m
 * @param Set<String> patterns
 * @return /util/note
 */
public static String first(Set<String> patterns) {
    String str = "";
    if (patterns != null && patterns.size() > 0) {
        Iterator<String> iterator = patterns.iterator();
        while (iterator.hasNext()) {
            str = (String) iterator.next();
            str = str.replaceAll("//", "/");
            break;
        }
    }
    return str;
}

From source file:Main.java

public static String buildValuesString(List<Object> values) {
    StringBuilder sb = new StringBuilder();
    Iterator<Object> valueIt = values.iterator();
    while (valueIt.hasNext()) {
        sb.append(valueIt.next());/*  w w w . j  a  v  a 2s. c o m*/
        if (valueIt.hasNext()) {
            sb.append(";");
        }
    }
    return sb.toString();
}

From source file:Main.java

@SuppressWarnings({ "rawtypes", "unchecked" })
static HashMap<String, Object> toMap(JSONObject object) throws JSONException {
    if (object == null) {
        return null;
    }//from  w ww  .  j  a  va2s.co  m
    HashMap<String, Object> map = new HashMap();
    Iterator keys = object.keys();
    while (keys.hasNext()) {
        String key = (String) keys.next();
        map.put(key, fromJson(object.get(key)));
    }
    return map;
}