Java ConcurrentLinkedQueue size() Method

by Online Tutorials Library July 22, 2022

Java ConcurrentLinkedQueue size() method

The size() method of ConcurrentLinkedQueue class returns the total count of the elements present in the queue.

Syntax:

Parameters:

Specified By:

The size() method of PriorityQueue class is specified by :

size() method in interface Collection<E>.

Return Value:

The size() method returns the total count of the elements present in this queue.

Example 1

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueSizeExample1 {      public static void main(String[] args) {          ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();          queue.offer(12);          queue.offer(67);          queue.offer(45);          queue.offer(123);          //will return the total size of queue          int a= queue.size();          System.out.println(“The size of queue : “+a);          System.out.println(“Queue : “+queue);      }  }  

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Output:

The size of queue : 4  Queue : [12, 67, 45, 123]

Example 2

  import java.util.*;  import java.util.concurrent.ConcurrentLinkedQueue;  class Patients{      String Pname;      public Patients(String pname) {          Pname = pname;      }      public String toString(){          return this.Pname;      }  }  public class ConcurrentLinkedQueueSizeExample2 {      static int i=1;      public static void main(String[] args) {      Patients patient1 = new Patients(“Megha”);      Patients patient2 = new Patients(“Reema”);      Patients patient3 = new Patients(“Supriya”);      Patients patient4 = new Patients(“Anoop”);      Patients patient5 = new Patients(“Sonia”);      Patients patient6 = new Patients(“Tejashvi”);          ConcurrentLinkedQueue<Patients> queue = new ConcurrentLinkedQueue<Patients>();          List<Patients> list = new ArrayList<Patients>();          queue.add(patient1);          queue.add(patient2);          queue.add(patient3);          queue.add(patient4);          queue.add(patient5);          queue.add(patient6);          // returns the total size of the queue          System.out.println(“Total Patients = “+queue.size());          for(Patients xyz : queue){              System.out.println(i++ +”.”+xyz);          }          list.add(patient1);          list.add(patient2);          list.add(patient3);          list.add(patient4);          i=1;          System.out.println(“Patients recovered and discharged : “+list);          queue.removeAll(list);          System.out.println(“Patients left in the hospital = “+queue.size());          for (Patients xyz : queue) {              System.out.println(i++ +”.”+xyz);          }      }  }  

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Output:

Total Patients = 6  1.Megha  2.Reema  3.Supriya  4.Anoop  5.Sonia  6.Tejashvi  Patients recovered and discharged : [Megha, Reema, Supriya, Anoop]  Patients left in the hospital = 2  1.Sonia  2.Tejashvi

Example 3

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueSizeExample3 {      public static void main(String[] args) {          ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();          queue.add(null);          queue.add(null);          int val =queue.size();          System.out.println(“Size of queue = “+val);      }  }  

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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.ConcurrentLinkedQueueSizeExample3.main(ConcurrentLinkedQueueSizeExample3.java:7)

Next TopicJava ConcurrentLinkedQueue

Java ConcurrentLinkedQueue size() Method

Java ConcurrentLinkedQueue size() method

Syntax:

Parameters:

Specified By:

Return Value:

Example 1

Example 2

Example 3

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