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)
