LinkedTransferQueue add() method in Java

The add() method of java.util.concurrent.LinkedTransferQueue is an in-built function in Java which is used to insert an element in this queue.

Syntax:

LinkedTransferQueue.add(E e)

Parameters: The function accepts a single parameter e i.e. the element to be inserted.

Return Value: The function returns a boolean value.

Exception: The function throws NullPointerException when the specified element is Null.

Below programs illustrate the use of java.util.concurrent.LinkedTransferQueue.add() :

Program 1: Inserting Integers in the queue.

// Java Program Demonstrate add()
// method of LinkedTransferQueue

import java.util.concurrent.*;

class LinkedTransferQueueAddExample1 {
    public static void main(String[] args)
    {

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

        // Adding elements to this queue
        for (int i = 10; i <= 15; 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 + " ");
    }
}

Output:

The elements in the queue are:
10 11 12 13 14 15

Program 2: Adding String in the queue.

// Java Program Demonstrate add()
// method of LinkedTransferQueue

import java.util.concurrent.*;

class LinkedTransferQueueAddExample2 {
    public static void main(String[] args)
    {

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

        // Adding elements to this queue
        queue.add("a");
        queue.add("b");
        queue.add("c");
        queue.add("d");
        queue.add("e");

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

Output:

The elements in the queue are:
a b c d e

Program 3: To demonstrate NullPointerException

// Java Program Demonstrate add()
// method of LinkedTransferQueue

import java.util.concurrent.*;

class LinkedTransferQueueAddExample2 {
    public static void main(String[] args)
    {

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

        try {
            // Adding null to this queue
            queue.add(null);
        }
        catch (Exception e) {
            System.out.println("Exception: " + e);
        }
    }
}

Output:

Exception: java.lang.NullPointerException

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedTransferQueue.html#add(E)