PriorityBlockingQueue size() method in Java

The size() method of PriorityBlockingQueue is used to find the present size of the queue. It returns the number of elements in the collection. If the collection contains more than Integer.MAX_VALUE elements, then this method returns Integer.MAX_VALUE.

Syntax:

public int size()

Return Value: This method returns the number of elements present in this PriorityBlockingQueue



Below are the program to illustrate size() method of PriorityBlockingQueue:

Program 1:

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// Java program to demonstrate
// size() method
  
import java.util.concurrent.PriorityBlockingQueue;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<String> pbq
            = new PriorityBlockingQueue<String>();
  
        // Add element to PriorityBlockingQueue
        pbq.put("1");
        pbq.put("2");
        pbq.put("3");
        pbq.put("4");
  
        // print queue
        System.out.println("Queue:  " + pbq);
        System.out.println("Queue Size:  " + pbq.size());
    }
}

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Output:

Queue:  [1, 2, 3, 4]
Queue Size:  4

Program 2: To demonstrate size() for dynamically changing queue.

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// Java program to demonstrate 
// size() method 
  
import java.util.concurrent.PriorityBlockingQueue;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<String> pbq
            = new PriorityBlockingQueue<String>();
  
        // Add element to PriorityBlockingQueue
        pbq.put("1");
        pbq.put("2");
        pbq.put("3");
        pbq.put("4");
  
        // print queue
        System.out.println("Queue:  " + pbq);
        System.out.println("Queue Size:  " + pbq.size());
  
        // remove 2
        boolean res = pbq.remove("2");
        System.out.println("\n2 removed: " + res);
  
        // print queue
        System.out.println("Queue:  " + pbq);
        System.out.println("Queue Size:  " + pbq.size());
  
        // add  5
        pbq.put("5");
  
        // print queue
        System.out.println("\n5 added");
        System.out.println("Queue:  " + pbq);
        System.out.println("Queue Size:  " + pbq.size());
    }
}

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Output:

Queue:  [1, 2, 3, 4]
Queue Size:  4

2 removed: true
Queue:  [1, 4, 3]
Queue Size:  3

5 added
Queue:  [1, 4, 3, 5]
Queue Size:  4


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