Examples of java.util.Queue.poll()

java.util.Queue.poll()
Retrieves and removes the head of this queue, or returns null if this queue is empty. @return the head of this queue, or null if this queue is empty

        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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    @Test
    public void testFIFO() {
        Queue q = new LinkedBlockingDeque();
        q.add("test");
        q.add("pest");
        assertEquals("test", q.poll());


        q = new LinkedBlockingQueue();
        q.add("test");
        q.add("pest");
        assertEquals("test", q.poll());

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        assertEquals("test", q.poll());


        q = new LinkedBlockingQueue();
        q.add("test");
        q.add("pest");
        assertEquals("test", q.poll());


        Stack v = new Stack();
        v.add("test");
        v.add("pest");
        assertEquals("pest", v.pop());

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        db.close();
        db = DBMaker.newFileDB(f).transactionDisable().cacheDisable().deleteFilesAfterClose().make();
        queue = db.getCircularQueue("test");


        assertEquals(2, queue.poll());
        assertEquals(3, queue.poll());
        assertEquals(4, queue.poll());
        assertEquals(5, queue.poll());
        assertNull(queue.poll());
        db.close();

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        db.close();
        db = DBMaker.newFileDB(f).transactionDisable().cacheDisable().deleteFilesAfterClose().make();
        queue = db.getCircularQueue("test");


        assertEquals(2, queue.poll());
        assertEquals(3, queue.poll());
        assertEquals(4, queue.poll());
        assertEquals(5, queue.poll());
        assertNull(queue.poll());
        db.close();

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        db = DBMaker.newFileDB(f).transactionDisable().cacheDisable().deleteFilesAfterClose().make();
        queue = db.getCircularQueue("test");


        assertEquals(2, queue.poll());
        assertEquals(3, queue.poll());
        assertEquals(4, queue.poll());
        assertEquals(5, queue.poll());
        assertNull(queue.poll());
        db.close();


    }

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        queue = db.getCircularQueue("test");


        assertEquals(2, queue.poll());
        assertEquals(3, queue.poll());
        assertEquals(4, queue.poll());
        assertEquals(5, queue.poll());
        assertNull(queue.poll());
        db.close();


    }

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        assertEquals(2, queue.poll());
        assertEquals(3, queue.poll());
        assertEquals(4, queue.poll());
        assertEquals(5, queue.poll());
        assertNull(queue.poll());
        db.close();


    }


    @Test

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