The isEmpty() method of ConcurrentLinkedQueue is used to check if this queue is empty or not. It returns true if ConcurrentLinkedQueue contains zero number of elements means if the ConcurrentLinkedQueue is empty.
Syntax:
public boolean isEmpty()
Returns: This method returns true if this ConcurrentLinkedQueue contains zero number of elements.
Below programs illustrate isEmpty() method of ConcurrentLinkedQueue:
Example 1:
// Java Program Demonstrate isEmpty()// method of ConcurrentLinkedQueue import java.util.concurrent.*; public class GFG { public static void main(String[] args) { // create an ConcurrentLinkedQueue ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue<String>(); // Add String to queue queue.add("Aman"); queue.add("Amar"); queue.add("Sanjeet"); queue.add("Rabi"); // Displaying the existing ConcurrentLinkedQueue System.out.println("ConcurrentLinkedQueue: " + queue); // check whether queue isEmpty or not boolean response1 = queue.isEmpty(); // print after applying isEmpty method System.out.println("Is Queue empty: " + response1); }} |
Output:
ConcurrentLinkedQueue: [Aman, Amar, Sanjeet, Rabi] Is Queue empty: false
Example 2:
// Java Program Demonstrate isEmpty()// method of ConcurrentLinkedQueue import java.util.concurrent.*; public class GFG { public static void main(String[] args) { // create an ConcurrentLinkedQueue ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>(); // Displaying the existing ConcurrentLinkedQueue System.out.println("ConcurrentLinkedQueue: " + queue); // check whether queue is Empty boolean response1 = queue.isEmpty(); // print after applying isEmpty method System.out.println("Is queue empty : " + response1); }} |
Output:
ConcurrentLinkedQueue: [] Is queue empty : true
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentLinkedQueue.html#isEmpty–