Q:

Scala program to get the first item from the front-end in the queue

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YasminRadwan26
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2022-07-08
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Here, we will create a queue using the Queue collection class. Then we will access the first item of the queue from the front-end and print the result 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 get the first item from the front-end in the queue is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Scala program to get the first item from
// front-end in queue

import scala.collection.immutable._

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

    println("First item at front end: " + queue.front)

    println("Queue elements:");
    queue.foreach((ele: Int) => print(ele + " "))

    println();
  }
}

Output:

First item at front end: 10
Queue elements:
10 20 30 40 50

Explanation:

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

import scala.collection.immutable._

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 a queue queue using Queue collection class. The queue contains integer elements. Then we accessed the first element from the queue at the front end. After that, we printed the created queues on the console screen.

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