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Java program to iterate Queue elements using the iterator() method

Java example to iterate Queue elements using the iterator() method.
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 iterate the queue elements using the iterator() method of the Iterator class.

Source Code

The source code to iterate Queue elements using the iterator() method is given below. The given program is compiled and executed successfully.

// Java program to iterate Queue elements 
// using iterator() method

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() + " ");
    }
  }
}

Output

Queue elements: 
10 20 30 40 50 

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 used the Iterator class and its methods to access elements of the Queue collection and printed the result.

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