LinkedTransferQueue add() method in Java

Last Updated : 14 Sep, 2018

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

// 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

// 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

// 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)

LinkedTransferQueue add() method in Java

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LinkedTransferQueue add() method in Java

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