Java Programs

Java Practice

Java program to implement Queue using ArrayDeque class

Java example to implement Queue using ArrayDeque class.
Submitted by Nidhi, on April 28, 2022

Problem statement

In this program, we will create 3 queues using the Queue interface with the help of ArrayDequeue class and store elements in a FIFO (First In First Out) manner. Here, we will compare queues using the equals() method.

Source Code

The source code to implement Queue using ArrayDeque class is given below. The given program is compiled and executed successfully.

// Java program to implement Queue 
// using ArrayDeque class

import java.util.*;

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

    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 ArrayDeque class and added items to it. Then we printed items of the queue.