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Java program to compare two queues

Java example to compare two queues.
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 Linked List collection and store elements in a FIFO (First In First Out) manner. Here, we will compare queues using the equals() method.

Java program to compare two queues

The source code to compare two queues is given below. The given program is compiled and executed successfully.

// Java program to compare two queues

import java.util.*;

public class Main {
  public static void main(String[] args) {
    Queue < Integer > queue1 = new LinkedList < > ();
    Queue < Integer > queue2 = new LinkedList < > ();
    Queue < Integer > queue3 = new LinkedList < > ();

    queue1.add(10);
    queue1.add(20);
    queue1.add(30);

    queue2.add(40);
    queue2.add(50);

    queue3.add(40);
    queue3.add(50);

    if (queue1.equals(queue2))
      System.out.println("The queue1 and queue2 have similar elements.");
    else
      System.out.println("The queue1 and queue2 have different elements.");

    if (queue2.equals(queue3))
      System.out.println("The queue2 and queue3 have similar elements.");
    else
      System.out.println("The queue2 and queue3 have different elements.");
  }
}

Output

The queue1 and queue2 have different elements.
The queue2 and queue3 have similar elements.

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 compared queues using the equals() method and printed the appropriate message.

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