Java ConcurrentLinkedQueue add() Method with Examples

by Online Tutorials Library July 22, 2022

Java ConcurrentLinkedQueue add() method

The add() method of ConcurrentLinkedQueue class inserts the specified element at the tail of this ConcurrentLinkedQueue. The addAll() method overrides the addAll in class AbstractQueue<E>

Syntax

Parameter

e– It is the element to add

Specified By

The add() method of ConcurrentLinkedQueue class is specified by :

add() method in interface Queue<E>.
add() method in interface Collection<E>.

Return Value

The add() method returns a Boolean value true.

Throws

NullPointerException: If the specified element e is null.

Example 1

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueAddExample1 {  public static void main(String[] args) {  int j =1;  ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();  for (int i = 1; i <=5; i++) {  //  Adding items to the tail of this queue  queue.add(i);  System.out.println(“After adding “+ j++ +” to the queue :”);  System.out.println(queue);          }      }  }  

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Output:

After adding 1 to the queue :  [1]  After adding 2 to the queue :  [1, 2]  After adding 3 to the queue :  [1, 2, 3]  After adding 4 to the queue :  [1, 2, 3, 4]  After adding 5 to the queue :  [1, 2, 3, 4, 5]

Example 2

  import java.util.Collections;  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueAddExample2 {  public static void main(String[] args) {          Integer[] val = {0, 1};  ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();  queue.add(718);  queue.add(8);  queue.add(18);  queue.add(119);  System.out.println(“Queue : “);  for (Integer n : queue) {  System.out.println(n);  val[0] = Collections.max(queue);  val[1] = Collections.min(queue);          }  System.out.println(“Max number = “+ val[0]);  System.out.println(“Min number = “+ val[1]);      }  }  

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Output:

Queue :  718  8  18  119  Max number = 718  Min number = 8

Example 3

  import java.util.concurrent.ConcurrentLinkedQueue;  class Name{  private String name;    public Name(String name) {  this.name = name;      }  public String toString(){  return “Name = “+ this.name;      }  }  public class ConcurrentLinkedQueueAddExample3 {  public static int i=1;  public static void main(String[] args) {  ConcurrentLinkedQueue<Name> queue = new ConcurrentLinkedQueue<Name>();          Name s1 = new Name(“Reema”);          Name s2 = new Name(“Jyoti”);          Name s3 = new Name(“Rahul”);          Name s4 = new Name(“Anushtha”);  queue.add(s1);  queue.add(s2);  queue.add(s3);  queue.add(s4);  for (Name xyz : queue){  System.out.println(i++ + “. “+xyz);          }      }  }  

Test it Now

Output:

1. Name = Reema  2. Name = Jyoti  3. Name = Rahul  4. Name = Anushtha

Example 4

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueAddExample4 {  public static void main(String[] args) {  ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();  queue.add(null);  queue.add(90);  queue.add(187);      }  }  

Test it Now

Output:

Exception in thread "main" java.lang.NullPointerException  at java.util.concurrent.ConcurrentLinkedQueue.checkNotNull(ConcurrentLinkedQueue.java:920)  at java.util.concurrent.ConcurrentLinkedQueue.offer(ConcurrentLinkedQueue.java:327)  at java.util.concurrent.ConcurrentLinkedQueue.add(ConcurrentLinkedQueue.java:297)  at com.tutorAspire.ConcurrentLinkedQueueAddExample4.main(ConcurrentLinkedQueueAddExample4.java:7)

If any of the specified elements in this queue is null, it will give NullPointerException as described above.

Next TopicJava ConcurrentLinkedQueue

Java ConcurrentLinkedQueue add() Method with Examples

Java ConcurrentLinkedQueue add() method

Syntax

Parameter

Specified By

Return Value

Throws

Example 1

Example 2

Example 3

Example 4

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