Example usage for java.util ArrayDeque iterator

Introduction

In this page you can find the example usage for java.util ArrayDeque iterator.

Prototype

public Iterator<E> iterator() 

Source Link

Document

Returns an iterator over the elements in this deque.

Usage

From source file:Main.java

public static void main(String[] args) {

    ArrayDeque<Integer> deque = new ArrayDeque<Integer>(8);

    deque.add(3);/*from  ww w .  j a  v  a  2 s.  c  o m*/
    deque.add(4);
    deque.add(25);
    deque.add(1);

    for (Iterator itr = deque.iterator(); itr.hasNext();) {
        System.out.println(itr.next());
    }
}

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From source file:Main.java

public static void main(String[] args) {

    ArrayDeque<Integer> deque = new ArrayDeque<Integer>(8);

    deque.add(3);// www .  j  av a 2s .  c  om
    deque.add(4);
    deque.add(25);
    deque.add(1);

    //iterator() is used to print all the elements
    //next() returns the next element on each iteration
    System.out.println("printing elements using iterator:");

    for (Iterator itr = deque.iterator(); itr.hasNext();) {
        System.out.println(itr.next());
    }

    //descendingIterator() is used to print the elements in reverse order
    //next() returns the next element on each iteration
    System.out.println("printing elements in reverse order:");

    for (Iterator descItr = deque.descendingIterator(); descItr.hasNext();) {
        System.out.println(descItr.next());
    }
}

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From source file:com.google.gwt.emultest.java.util.ArrayDequeTest.java

public void testFailFastIterator() {
    ArrayDeque<Object> deque = new ArrayDeque<>(asList(getFullNonNullElements()));
    Iterator<Object> it = deque.iterator();
    it.next();/*from  w w  w .  jav  a  2  s.c  o  m*/
    deque.removeFirst();
    try {
        it.next();
    } catch (ConcurrentModificationException e) {
        fail();
    }
    deque.removeLast();
    try {
        it.next();
        fail();
    } catch (ConcurrentModificationException expected) {
    }

    deque = new ArrayDeque<>(asList(getFullNonNullElements()));
    it = deque.iterator();
    it.next();
    deque.clear();
    try {
        it.next();
        fail();
    } catch (ConcurrentModificationException expected) {
    }

    deque = new ArrayDeque<>(asList(getFullNonNullElements()));
    it = deque.iterator();
    it.next();
    deque.addFirst(new Object());
    try {
        it.next();
    } catch (ConcurrentModificationException e) {
        fail();
    }
    deque.addLast(new Object());
    try {
        it.next();
        fail();
    } catch (ConcurrentModificationException expected) {
    }

    deque = new ArrayDeque<>(asList(getFullNonNullElements()));
    it = deque.iterator();
    it.next();
    it.next();
    deque.removeFirst();
    try {
        it.remove();
    } catch (ConcurrentModificationException e) {
        fail();
    }

    deque = new ArrayDeque<>(asList(getFullNonNullElements()));
    it = deque.iterator();
    it.next();
    it.next();
    deque.removeFirst();
    deque.removeFirst();
    try {
        it.remove();
        fail();
    } catch (ConcurrentModificationException expected) {
    }
}

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From source file:com.google.gwt.emultest.java.util.ArrayDequeTest.java

public void testRolloverInvariants() {
    ArrayDeque<Integer> deque = new ArrayDeque<>();

    assertTrue(deque.add(1));//from   ww w .j  ava2 s .  co m
    assertEquals(1, (int) deque.removeFirst());
    for (int i = 0; i < 100; i++) {
        assertTrue(deque.add(i));
    }
    assertNotNull(deque.peek());
    assertFalse(deque.isEmpty());

    Iterator<Integer> it = deque.iterator();
    for (int i = 0; i < 100; i++) {
        assertTrue(it.hasNext());
        assertEquals(i, (int) it.next());
        it.remove();
    }
    assertFalse(it.hasNext());
    assertNull(deque.peek());
    assertTrue(deque.isEmpty());
}

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From source file:com.espertech.esper.epl.core.ResultSetProcessorRowPerGroupRollup.java

public Iterator<EventBean> getIterator(Viewable parent) {
    if (!prototype.isHistoricalOnly()) {
        return obtainIterator(parent);
    }//from www . ja  va2s.c om

    aggregationService.clearResults(agentInstanceContext);
    Iterator<EventBean> it = parent.iterator();
    EventBean[] eventsPerStream = new EventBean[1];
    Object[] groupKeys = new Object[prototype.getGroupByRollupDesc().getLevels().length];
    AggregationGroupByRollupLevel[] levels = prototype.getGroupByRollupDesc().getLevels();
    for (; it.hasNext();) {
        eventsPerStream[0] = it.next();
        Object groupKeyComplete = generateGroupKey(eventsPerStream, true);
        for (int j = 0; j < levels.length; j++) {
            Object subkey = levels[j].computeSubkey(groupKeyComplete);
            groupKeys[j] = subkey;
        }
        aggregationService.applyEnter(eventsPerStream, groupKeys, agentInstanceContext);
    }

    ArrayDeque<EventBean> deque = ResultSetProcessorUtil.iteratorToDeque(obtainIterator(parent));
    aggregationService.clearResults(agentInstanceContext);
    return deque.iterator();
}

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