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Java program to get the size of the Queue collection

Java example to get the size of the Queue collection.
Submitted by Nidhi, on April 28, 2022

Problem statement

In this program, we will create a queue using the Queue interface with the help of Linked List collection and store elements in a FIFO (First In First Out) manner. Here, we will find the size of the Queue using the size() method.

Source Code

The source code to get the size of the Queue collection is given below. The given program is compiled and executed successfully.

// Java program to get the size of 
// the Queue collection

import java.util.*;

public class Main {
  public static void main(String[] args) {
    Queue < Integer > queue = new LinkedList < > ();

    queue.add(10);
    queue.add(20);
    queue.add(30);
    queue.add(40);
    queue.add(50);

    Iterator itr = queue.iterator();
    System.out.println("Queue elements: ");
    while (itr.hasNext()) {
      System.out.print(itr.next() + " ");
    }
    System.out.println("\nSize of Queue is: " + queue.size());
  }
}

Output

Queue elements: 
10 20 30 40 50 
Size of Queue is: 5

Explanation

In the above program, we imported the "java.util.*" package to use the Queue Interface and LinkedList collection. Here, we created a class Main. The Main class contains a main() method. The main() method is the entry point for the program.

In the main() method, we created a queue using the LinkedList collection and added items to it. Then we got the size of Queue using the size() method and printed the result.

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