Java ConcurrentLinkedQueue isEmpty() Method with Examples

by Online Tutorials Library July 22, 2022

Java ConcurrentLinkedQueue isEmpty() Method

The isEmpty() method of ConcurrentLinkedQueue class returns a Boolean value true if the defined queue contains no element. The isEmpty() method of class ConcurrentLinkedQueue is overrided by isEmpty() method in class AbstractCollection<E>.

Syntax

Parameter

Specified By

The isEmpty() method of ConcurrentLinkedQueue class is specified by isEmpty()method in interface Collection<E>.

Return Value

The isEmpty() method returns Boolean value true if the defined queue contains no element.

Example 1

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueIsEmptyExample1 {  public static void main(String[] args) {  ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();  for (int i = 1; i <= 5; i++) {  //  Adding items to the tail of this queue  queue.add(i);          }  //returns true if the queue is empty  if(queue.isEmpty()){  System.out.println(“Add some elements because the queue is empty.”);          }  else{  System.out.println(“Elements are : “+queue);          }      }  }  

Test it Now

Output:

Elements are : [1, 2, 3, 4, 5]

Example 2

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueIsEmptyExample2 {  public static void main(String[] args) {  ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();  for (int i = 1; i <= 5; i++) {  //  Adding items to the tail of this queue  queue.add(i);          }  queue.clear();  if(queue.isEmpty()){  System.out.println(“isEmpty() method returns “+queue.isEmpty());  System.out.println(“Add some elements because the queue is empty.”);          }  else{  System.out.println(“isEmpty() method returns “+queue.isEmpty());  System.out.println(“Elements are : “+queue);          }      }  }  

Test it Now

Output:

isEmpty() method returns true  Add some elements because the queue is empty.

Example 3

  import java.util.Scanner;  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueIsEmptyExample3 {  static int size =3;  public static void main(String[] args) {          Scanner scanner = new Scanner(System.in);  ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue<String>();  if(queue.isEmpty()) {  System.out.println(“Enter three names “);  for (int i = 1; i <= size; i++) {  System.out.print(i+”. Name = “);                String a = scanner.next();  queue.add(a);            }  System.out.println(“Queue : “+queue);        }  else{  System.out.println(“Queue is full”);        }      }  }  

Output:

Enter five names   1. Name = Reema  2. Name = Himanshu  3. Name = Rahul  Queue : [Reema, Himanshu, Rahul]

Next TopicJava ConcurrentLinkedQueue

Java ConcurrentLinkedQueue isEmpty() Method with Examples

Java ConcurrentLinkedQueue isEmpty() Method

Syntax

Parameter

Specified By

Return Value

Example 1

Example 2

Example 3

Java ConcurrentHashMap putIfAbsent() Method

Java Abstract Keyword

You may also like