Examples of java.util.LinkedList.poll()

java.util.LinkedList.poll()
Retrieves and removes the head (first element) of this list @return the head of this list, or null if this list is empty @since 1.5

        Directory directory;


        // Try all of the directories in a breadth first order, hence the
        // reason for the queue to see if any of them can allocate a file.
        queue.add(root);
        while ((directory = (Directory) queue.poll()) != null) {
            File newFile = directory.allocateFile(queue);
            if (newFile != null) {
                return newFile;
            }
        }

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        }


        // None of them could so now try all of the directories to see if any
        // of them can allocate a directory.
        queue.add(root);
        while ((directory = (Directory) queue.poll()) != null) {


            Directory newDirectory = directory.allocateDirectory(queue);
            if (newDirectory != null) {
                File newFile = newDirectory.allocateFile(null);
                if (newFile != null) {

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    }


    public void test_poll() {
        assertEquals("should return the head", objArray[0], ll.poll());
        LinkedList list = new LinkedList();
        assertNull("should return 'null' if list is empty", list.poll());
    }


    public void test_remove() {
        for (int i = 0; i < objArray.length; i++) {
            assertEquals("should remove the head", objArray[i], ll.remove());

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      {
         LinkedList list = lists[index];


         Assert.assertNotNull(list);


         int elem = (Integer)list.poll();


         Assert.assertEquals(messageCount, elem);


         index++;

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    }


    public void test_poll() {
        assertEquals("should return the head", objArray[0], ll.poll());
        LinkedList list = new LinkedList();
        assertNull("should return 'null' if list is empty", list.poll());
    }


    public void test_remove() {
        for (int i = 0; i < objArray.length; i++) {
            assertEquals("should remove the head", objArray[i], ll.remove());

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      {
         LinkedList list = lists[index];


         Assert.assertNotNull(list);


         int elem = (Integer)list.poll();


         Assert.assertEquals(messageCount, elem);


         index++;

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    }


    public void test_poll() {
        assertEquals("should return the head", objArray[0], ll.poll());
        LinkedList list = new LinkedList();
        assertNull("should return 'null' if list is empty", list.poll());
    }


    public void test_remove() {
        for (int i = 0; i < objArray.length; i++) {
            assertEquals("should remove the head", objArray[i], ll.remove());

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      {
         LinkedList list = lists[index];


         Assert.assertNotNull(list);


         int elem = (Integer)list.poll();


         Assert.assertEquals(messageCount, elem);


         index++;

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      {
         LinkedList list = lists[index];


         Assert.assertNotNull(list);


         int elem = (Integer)list.poll();


         Assert.assertEquals(messageCount, elem);


         index++;

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      {
         LinkedList list = lists[index];


         Assert.assertNotNull(list);


         int elem = (Integer)list.poll();


         Assert.assertEquals(messageCount, elem);


         index++;

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