Q:

Scala program to check a queue is empty or not

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YasminRadwan26
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2022-07-08
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Here, we will create two queues using the Queue collection class. Then we will check queue is empty or not using isEmpty() method and print the appropriate message on the console screen.

The Queue is a linear data structure, It follows the First In First Out (FIFO) property. We can insert and remove the item in the queue from different ends of the queue.

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YasminRadwan26
2022-07-08
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Program/Source Code:

The source code to check a queue is empty or not is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Scala program to check a queue is empty or not

import scala.collection.mutable._

object Sample {
  // Main method
  def main(args: Array[String]) {
    var queue1 = Queue();
    var queue2 = Queue(10, 20, 30, 40, 50);

    if (queue1.isEmpty)
      println("queue1 is empty");
    else
      println("queue1 is not empty");

    if (queue2.isEmpty)
      println("queue2 is empty");
    else
      println("queue2 is not empty");
  }
}

Output:

queue1 is empty
queue2 is not empty

Explanation:

Here, we used an object-oriented approach to create the program. And, we imported Collection classes using the below statement,

import scala.collection.mutable._

And, we also created a singleton object Sample and defined the main() function. The main() function is the entry point for the program.

In the main() function, we created two queues queue1 and queue2 using Queue collection class. Then we checked queues are empty or not using the isEmpty() method and print appropriate messages on the console screen.

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