The size() method of ConcurrentLinkedQueue is used to returns number of elements that this ConcurrentLinkedQueue contains.
Syntax:
public int size()
Returns: This method number of elements in this ConcurrentLinkedQueue.
Below programs illustrate size() method of ConcurrentLinkedQueue:
Example 1:
// Java Program Demonstrate size()// 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>(); // Add Numbers to queue queue.add(4353); queue.add(7824); queue.add(78249); queue.add(8724); // Displaying the existing ConcurrentLinkedQueue System.out.println("ConcurrentLinkedQueue: " + queue); // apply size() int size = queue.size(); // print after applying size method System.out.println("Size of ConcurrentLinkedQueue: " + size); }} |
Output:
ConcurrentLinkedQueue: [4353, 7824, 78249, 8724] Size of ConcurrentLinkedQueue: 4
Example 2:
// Java Program Demonstrate size()// 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); // apply size() on queue int size = queue.size(); // print after applying size method System.out.println("Size of ConcurrentLinkedQueue: " + size); // removal of some elements queue.poll(); queue.poll(); // get size of ConcurrentLinkedQueue again size = queue.size(); // Displaying the existing ConcurrentLinkedQueue System.out.println("After 2 removal of elements\n" + "ConcurrentLinkedQueue: " + queue); // print after applying size method System.out.println("Size of ConcurrentLinkedQueue: " + size); }} |
Output:
ConcurrentLinkedQueue: [Aman, Amar, Sanjeet, Rabi] Size of ConcurrentLinkedQueue: 4 After 2 removal of elements ConcurrentLinkedQueue: [Sanjeet, Rabi] Size of ConcurrentLinkedQueue: 2
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentLinkedQueue.html#size–
