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]

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