Example usage for java.util Queue remove

Introduction

In this page you can find the example usage for java.util Queue remove.

Prototype

E remove();

Source Link

Document

Retrieves and removes the head of this queue.

Usage

From source file:Main.java

public static void main(String[] args) {
    Queue<String> queue = new LinkedList<String>();
    queue.offer("First");
    queue.offer("Second");
    queue.offer("Third");
    queue.offer("Fourth");

    queue.remove();

    System.out.println(queue);/* www  .j  a va 2 s. c  o m*/
}

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From source file:Main.java

public static void main(String[] args) {
    Queue<String> queue = new LinkedList<String>();

    queue.add("A");
    queue.add("B");

    queue.offer("C");
    queue.offer("D");

    System.out.println("remove: " + queue.remove());

    System.out.println("element: " + queue.element());

    System.out.println("poll: " + queue.poll());

    System.out.println("peek: " + queue.peek());
}

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From source file:CircularArrayQueueTest.java

public static void main(String[] args) {
    Queue<String> q = new CircularArrayQueue<String>(5);
    q.add("Amy");
    q.add("Bob");
    q.add("Carl");
    q.add("Deedee");
    q.add("Emile");
    q.remove();
    q.add("Fifi");
    q.remove();/*from w  w w  . j  a va2 s.  c o  m*/
    for (String s : q)
        System.out.println(s);
}

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From source file:com.ok2c.lightmtp.examples.MailUserAgentExample.java

public static void main(final String[] args) throws Exception {

    String text1 = "From: root\r\n" + "To: testuser1\r\n" + "Subject: test message 1\r\n" + "\r\n"
            + "This is a short test message 1\r\n";
    String text2 = "From: root\r\n" + "To: testuser1, testuser2\r\n" + "Subject: test message 2\r\n" + "\r\n"
            + "This is a short test message 2\r\n";
    String text3 = "From: root\r\n" + "To: testuser1, testuser2, testuser3\r\n" + "Subject: test message 3\r\n"
            + "\r\n" + "This is a short test message 3\r\n";

    List<DeliveryRequest> requests = new ArrayList<DeliveryRequest>();
    requests.add(new BasicDeliveryRequest("root", Arrays.asList("testuser1"),
            new ByteArraySource(text1.getBytes("US-ASCII"))));
    requests.add(new BasicDeliveryRequest("root", Arrays.asList("testuser1", "testuser2"),
            new ByteArraySource(text2.getBytes("US-ASCII"))));
    requests.add(new BasicDeliveryRequest("root", Arrays.asList("testuser1", "testuser2", "testuser3"),
            new ByteArraySource(text3.getBytes("US-ASCII"))));

    MailUserAgent mua = new DefaultMailUserAgent(TransportType.SMTP, IOReactorConfig.DEFAULT);
    mua.start();/*from ww w  .  j  a v  a 2 s .  c o m*/

    try {

        InetSocketAddress address = new InetSocketAddress("localhost", 2525);

        Queue<Future<DeliveryResult>> queue = new LinkedList<Future<DeliveryResult>>();
        for (DeliveryRequest request : requests) {
            queue.add(mua.deliver(new SessionEndpoint(address), 0, request, null));
        }

        while (!queue.isEmpty()) {
            Future<DeliveryResult> future = queue.remove();
            DeliveryResult result = future.get();
            System.out.println("Delivery result: " + result);
        }

    } finally {
        mua.shutdown();
    }
}

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From source file:Main.java

public static void main(String[] args) {
    Queue<String> queue = new LinkedList<>();
    queue.add("Java");
    // offer() will work the same as add()
    queue.offer("SQL");
    queue.offer("CSS");
    queue.offer("XML");

    System.out.println("Queue: " + queue);

    // Let's remove elements until the queue is empty
    while (queue.peek() != null) {
        System.out.println("Head  Element: " + queue.peek());
        queue.remove();
        System.out.println("Removed one  element from  Queue");
        System.out.println("Queue: " + queue);
    }/* w  w w .  java  2  s.c om*/
    System.out.println("queue.isEmpty(): " + queue.isEmpty());
    System.out.println("queue.peek(): " + queue.peek());
    System.out.println("queue.poll(): " + queue.poll());
    try {
        String str = queue.element();
        System.out.println("queue.element(): " + str);
        str = queue.remove();
        System.out.println("queue.remove(): " + str);
    } catch (NoSuchElementException e) {
        System.out.println("queue.remove(): Queue is  empty.");
    }
}

---

From source file:ComparablePerson.java

public static void main(String[] args) {
    int initialCapacity = 5;
    Comparator<ComparablePerson> nameComparator = Comparator.comparing(ComparablePerson::getName);

    Queue<ComparablePerson> pq = new PriorityQueue<>(initialCapacity, nameComparator);
    pq.add(new ComparablePerson(1, "Oracle"));
    pq.add(new ComparablePerson(4, "XML"));
    pq.add(new ComparablePerson(2, "HTML"));
    pq.add(new ComparablePerson(3, "CSS"));
    pq.add(new ComparablePerson(4, "Java"));

    System.out.println("Priority  queue: " + pq);

    while (pq.peek() != null) {
        System.out.println("Head  Element: " + pq.peek());
        pq.remove();
        System.out.println("Removed one  element from  Queue");
        System.out.println("Priority  queue: " + pq);
    }//from  w w  w.  j  a va 2  s .c o m
}

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From source file:io.aos.protocol.http.httpcommon.FluentAsync.java

public static void main(String... args) throws Exception {
    // Use pool of two threads
    ExecutorService threadpool = Executors.newFixedThreadPool(2);
    Async async = Async.newInstance().use(threadpool);

    Request[] requests = new Request[] { Request.Get("http://www.google.com/"),
            Request.Get("http://www.yahoo.com/"), Request.Get("http://www.apache.com/"),
            Request.Get("http://www.apple.com/") };

    Queue<Future<Content>> queue = new LinkedList<Future<Content>>();
    // Execute requests asynchronously
    for (final Request request : requests) {
        Future<Content> future = async.execute(request, new FutureCallback<Content>() {

            public void failed(final Exception ex) {
                System.out.println(ex.getMessage() + ": " + request);
            }/*from   www  .j a va  2  s . co m*/

            public void completed(final Content content) {
                System.out.println("Request completed: " + request);
            }

            public void cancelled() {
            }

        });
        queue.add(future);
    }

    while (!queue.isEmpty()) {
        Future<Content> future = queue.remove();
        try {
            future.get();
        } catch (ExecutionException ex) {
        }
    }
    System.out.println("Done");
    threadpool.shutdown();
}

---

From source file:interoperabilite.webservice.fluent.FluentAsync.java

public static void main(String[] args) throws Exception {
    // Use pool of two threads
    ExecutorService threadpool = Executors.newFixedThreadPool(2);
    Async async = Async.newInstance().use(threadpool);

    Request[] requests = new Request[] { Request.Get("http://www.google.com/"),
            Request.Get("http://www.yahoo.com/"), Request.Get("http://www.apache.com/"),
            Request.Get("http://www.apple.com/") };

    Queue<Future<Content>> queue = new LinkedList<Future<Content>>();
    // Execute requests asynchronously
    for (final Request request : requests) {
        Future<Content> future = async.execute(request, new FutureCallback<Content>() {

            @Override/*w ww .  j  a  v  a  2s .c  om*/
            public void failed(final Exception ex) {
                System.out.println(ex.getMessage() + ": " + request);
            }

            @Override
            public void completed(final Content content) {
                System.out.println("Request completed: " + request);
            }

            @Override
            public void cancelled() {
            }

        });
        queue.add(future);
    }

    while (!queue.isEmpty()) {
        Future<Content> future = queue.remove();
        try {
            future.get();
        } catch (ExecutionException ex) {
        }
    }
    System.out.println("Done");
    threadpool.shutdown();
}

---

From source file:Main.java

public static <T extends Annotation> T getAnnotation(Class<?> clazz, Class<T> aClazz) {
    //Check class hierarchy
    for (Class<?> c = clazz; c != null; c = c.getSuperclass()) {
        T anno = c.getAnnotation(aClazz);
        if (anno != null) {
            return anno;
        }//from   w  w  w .  jav  a  2s .c o m
    }

    //Check interfaces (breadth first)
    Queue<Class<?>> q = new LinkedList<Class<?>>();
    q.add(clazz);
    while (!q.isEmpty()) {
        Class<?> c = q.remove();
        if (c != null) {
            if (c.isInterface()) {
                T anno = c.getAnnotation(aClazz);
                if (anno != null) {
                    return anno;
                }
            } else {
                q.add(c.getSuperclass());
            }
            q.addAll(Arrays.asList(c.getInterfaces()));
        }
    }

    return null;
}

---

From source file:org.apache.streams.util.ComponentUtils.java

public static String pollUntilStringNotEmpty(Queue queue) {

    String result = null;/*from   w  w  w.j a v a 2 s  .c o  m*/
    do {
        synchronized (ComponentUtils.class) {
            try {
                result = (String) queue.remove();
            } catch (Exception e) {
            }
        }
        Thread.yield();
    } while (result == null && !StringUtils.isNotEmpty(result));

    return result;
}

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