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–