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

/**
 * Creates new collection that contains only element whose string
 * representation starts with prefix It uses raw collection - not
 * parameterized. There is no {@link SuppressWarnings} annotation so IDE
 * will probably report rawtype and/or unchecked warnings.
 * //from   w w w. j a v a2  s  .co m
 * @param c
 *            raw collection to create prefixed collection from
 * @param prefix
 *            to use as filter
 * @return collection without nulls
 */
public static Collection withPrefixRaw(Collection c, String prefix) {
    Collection prefixed = new ArrayList();
    Iterator iterator = c.iterator();
    while (iterator.hasNext()) {
        Object o = iterator.next();
        if (o != null && o.toString().startsWith(prefix)) {
            prefixed.add(o);
        }
    }
    return prefixed;
}

From source file:Main.java

public static JSONObject shallowDiffJSONObjects(JSONObject jo1, JSONObject jo2) throws JSONException {
    JSONObject result = new JSONObject();
    Iterator<String> it = jo2.keys();
    while (it.hasNext()) {
        String key = it.next();//from  ww w  .  j  a v a2s . c  om

        // See if the key is missing or the value is different in the other object
        Object val1 = jo1.opt(key);
        Object val2 = jo2.get(key);

        if (val1 == null || !val2.equals(val1))
            result.put(key, val2);
    }

    return result;
}

From source file:Main.java

/**
 * Creates new collection that contains only element whose string
 * representation starts with prefix It is parameterized.
 * //from  www .j  a v a2  s  .com
 * @param c
 *            raw collection to create prefixed collection from
 * @param prefix
 *            to use as filter
 * @return collection without nulls
 */
public static <T> Collection<T> withPrefix(Collection<T> c, String prefix) {
    Collection<T> prefixed = new ArrayList<T>();
    Iterator<T> iterator = c.iterator();
    while (iterator.hasNext()) {
        T o = iterator.next();
        if (o != null && o.toString().startsWith(prefix)) {
            prefixed.add(o);
        }
    }
    return prefixed;
}

From source file:Main.java

public static boolean containsInstance(Collection collection, Object element) {
    if (collection != null) {
        Iterator it = collection.iterator();

        while (it.hasNext()) {
            Object candidate = it.next();
            if (candidate == element) {
                return true;
            }//  ww  w  .j  a va2  s  .c o  m
        }
    }

    return false;
}

From source file:Main.java

/**
 * Returns a {@link Collection} containing <tt><i>a</i> - <i>b</i></tt>. The
 * cardinality of each element <i>e</i> in the returned {@link Collection}
 * will be the cardinality of <i>e</i> in <i>a</i> minus the cardinality of
 * <i>e</i> in <i>b</i>, or zero, whichever is greater.
 * //ww w  .  j  a  v a  2 s .  c o  m
 * @see Collection#removeAll
 */
public static Collection subtract(final Collection a, final Collection b) {
    ArrayList list = new ArrayList(a);
    Iterator it = b.iterator();
    while (it.hasNext()) {
        list.remove(it.next());
    }
    return list;
}

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 removeFrom(Iterable<T> collection, Predicate<T> predicate) {
    Iterator<T> it = collection.iterator();

    while (it.hasNext()) {
        T o = it.next();/*  w w w . j a va 2 s  .  c o  m*/

        if (predicate.test(o)) {
            it.remove();
            return o;
        }
    }

    return null;
}

From source file:Main.java

public static void removeItemFromCollectionByUsingIteratorRemoveMethod(Collection<String> collection,
        String elementToBeRemoved) {

    Iterator iterator = collection.iterator();

    while (iterator.hasNext()) {
        String element = (String) iterator.next();

        if (element.equals(elementToBeRemoved)) {
            iterator.remove();/*from ww w. ja  v a  2s .  co  m*/
        }
    }
}

From source file:Main.java

public static boolean containsInstance(Collection collection, Object element) {
    if (collection != null) {
        Iterator i$ = collection.iterator();

        while (i$.hasNext()) {
            Object candidate = i$.next();
            if (candidate == element) {
                return true;
            }/*from   w w w . j  a  v a2  s.  com*/
        }
    }

    return false;
}

From source file:Main.java

public static boolean isServiceRunning(Context ctx, String className) {
    boolean isRunning = false;
    ActivityManager activityManager = (ActivityManager) ctx.getSystemService(Context.ACTIVITY_SERVICE);
    List servicesList = activityManager.getRunningServices(2147483647);
    Iterator l = servicesList.iterator();
    while (l.hasNext()) {
        ActivityManager.RunningServiceInfo si = (ActivityManager.RunningServiceInfo) l.next();
        if (className.equals(si.service.getClassName())) {
            isRunning = true;/*  w w w.j  a v  a 2  s  .  c  om*/
        }
    }
    return isRunning;
}