Java ConcurrentLinkedQueue addAll() Method with Examples

by Online Tutorials Library July 22, 2022

Java ConcurrentLinkedQueue addAll() method

The addAll() method of ConcurrentLinkedQueue class appends all of the elements in the specified collection at the tail of this ConcurrentLinkedQueue. The addAll() method overrides addAll in class AbstractQueue<E>

Syntax

Parameter

c– It is the element to be added into this queue

Specified By

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

addAll() method in interface Collection<E>.

Return Value

The addAll() method returns a Boolean value true if the queue has changed as a result of this call. Otherwise, it returns false.

Throws

NullPointerException: This exception will throw if the specified elements in the collection are null.

IllegalArgumentException: This exception will throw if the collection is this queue.

Example 1

  import java.util.ArrayList;  import java.util.List;  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueAddAllExample1 {  public static void main(String[] args) {  ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();          List<Integer> list = new ArrayList<Integer>();  System.out.println(”     Before applying addAll() : ” );  System.out.println(“Elements in queue : “+ queue);  for (int i = 1; i <11; i++) {  int j = i *5;  list.add(j);          }  System.out.println(“Elements in list : “+list);  System.out.println();  System.out.println(”     After applying addAll : “);  //will add all the elements int the queue which are present in list  queue.addAll(list);  System.out.println(“Elements in queue : ” + queue);  System.out.println(“Elements in list : “+list);      }  }  

Test it Now

Output:

     Before applying addAll() :   Elements in queue : []  Elements in list : [5, 10, 15, 20, 25, 30, 35, 40, 45, 50]         After applying addAll :  Elements in queue : [5, 10, 15, 20, 25, 30, 35, 40, 45, 50]  Elements in list : [5, 10, 15, 20, 25, 30, 35, 40, 45, 50]

Example 2

  import java.util.TreeSet;  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueAddAllExample2 {  public static void main(String[] args) {  TreeSet<Integer> list = new TreeSet<Integer>();  ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();  list.add(101);  list.add(null);  queue.addAll(list);  System.out.println(“Queue = “+queue);      }  }  

Test it Now

Output:

Exception in thread "main" java.lang.NullPointerException  atjava.util.TreeMap.put(TreeMap.java:563)  atjava.util.TreeSet.add(TreeSet.java:255)  at com.tutorAspire.ConcurrentLinkedQueueAddAllExample2.main(ConcurrentLinkedQueueAddAllExample2.java:10)

If any element of the specified element is null, it will give you NullPointerException as shown above.

Example 3

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueAddAllExample3 {  public static void main(String[] args) {  ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();  for (int i=0;i<=5;i++){  queue.add(i);          }  queue.addAll(queue);  System.out.println(queue);      }  }  

Test it Now

Output:

Exception in thread "main" java.lang.IllegalArgumentException  at java.util.concurrent.ConcurrentLinkedQueue.addAll(ConcurrentLinkedQueue.java:526)  at com.tutorAspire.ConcurrentLinkedQueueAddAllExample3.main(ConcurrentLinkedQueueAddAllExample3.java:12)

Next TopicJava ConcurrentLinkedQueue

Java ConcurrentLinkedQueue addAll() Method with Examples

Java ConcurrentLinkedQueue addAll() method

Syntax

Parameter

Specified By

Return Value

Throws

Example 1

Example 2

Example 3

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