TransferQueue Interface in Java

// Java Program Demonstrate TransferQueue

import java.util.concurrent.*;
import java.util.*;

public class TransferQueueDemo {
    public static void main(String[] args)
        throws InterruptedException
    {
        // create object of TransferQueue
        // using LinkedTransferQueue() constructor
        TransferQueue<Integer> TQ
            = new LinkedTransferQueue<Integer>();

        // Add numbers to end of queue
        TQ.add(7855642);
        TQ.add(35658786);
        TQ.add(5278367);
        TQ.add(74381793);

        // print Queue
        System.out.println("Queue1: " + TQ);

        // create object of TransferQueue
        // using LinkedTransferQueue(Collection c)
        // constructor
        TransferQueue<Integer> TQ2
            = new LinkedTransferQueue<Integer>(TQ);

        // print Queue
        System.out.println("Queue2: " + TQ2);
    }
}

// Java Program Demonstrate adding
// elements to TransferQueue

import java.util.concurrent.*;

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

        // Initializing the queue
        TransferQueue<Integer> queue
            = new LinkedTransferQueue<Integer>();

        // Adding elements to this queue
        for (int i = 10; i <= 14; i++)
            queue.add(i);

        // Add the element using offer() method
        System.out.println("adding 15 "
            + queue.offer(15, 5, TimeUnit.SECONDS));

        // Adding elements to this queue
        for (int i = 16; i <= 20; i++)
            queue.put(i);

        // Printing the elements of the queue
        System.out.println(
            "The elements in the queue are:");
        for (Integer i : queue)
            System.out.print(i + " ");

        System.out.println();

        // create another queue to demonstrate transfer
        // method
        TransferQueue<String> g
            = new LinkedTransferQueue<String>();

        new Thread(new Runnable() {
            public void run()
            {
                try {
                    System.out.println("Transferring"
                                       + " an element");

                    // Transfer a String element
                    // using transfer() method
                    g.transfer("is a computer"
                               + " science portal.");
                    System.out.println(
                        "Element "
                        + "transfer is complete");
                }
                catch (InterruptedException e1) {
                    System.out.println(e1);
                }
                catch (NullPointerException e2) {
                    System.out.println(e2);
                }
            }
        })
            .start();

        try {

            // Get the transferred element
            System.out.println("Geeks for Geeks "
                               + g.take());
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

// Java Program Demonstrate removing
// elements of TransferQueue

import java.util.concurrent.*;

class RemoveElementsExample {
    public static void main(String[] args)
    {
        // Initializing the queue
        TransferQueue<Integer> queue
            = new LinkedTransferQueue<Integer>();

        // Adding elements to this queue
        for (int i = 1; i <= 5; i++)
            queue.add(i);

        // Printing the elements of the queue
        System.out.println(
            "The elements in the queue are:");
        for (Integer i : queue)
            System.out.print(i + " ");

        // remove() method will remove the specified
        // element from the queue
        queue.remove(1);
        queue.remove(5);

        // Printing the elements of the queue
        System.out.println("\nRemaining elements in queue : ");
        for (Integer i : queue)
            System.out.print(i + " ");
    }
}

// Java Program Demonstrate 
// iterating over TransferQueue

import java.util.Iterator;
import java.util.concurrent.*;

class IteratingExample {
    public static void main(String[] args)
    {

        // Initializing the queue
        TransferQueue<String> queue
            = new LinkedTransferQueue<String>();

        // Adding elements to this queue
        queue.add("Gfg");
        queue.add("is");
        queue.add("fun!!");

        // Returns an iterator over the elements
        Iterator<String> iterator = queue.iterator();

        // Printing the elements of the queue
        while (iterator.hasNext())
            System.out.print(iterator.next() + " ");
    }
}