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Scala program to add elements to the HashMap collection

Here, we are going to learn how to add elements to the HashMap collection in Scala programming language?
Submitted by Nidhi, on June 11, 2021 [Last updated : March 11, 2023]

Scala - Add Elements to HashMap

Here, we will create a map using the HashMap collection. The HashMap collection stores elements in key/value pairs. It uses hash code to store elements and return a map. Then we will add elements to the HashMap collection using the "+" operator and printed the updated HashMap collection.

Scala code to add elements to the HashMap collection

The source code to add elements to the HashMap collection is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Scala program to add elements to the
// HashMap collection

import scala.collection.immutable._

object Sample {
  // Main method
  def main(args: Array[String]) {
    var students = HashMap((101, "Amit"), (102, "Arun"), (103, "Anit"))
    
    println("Student Information:");
    for ((stuId, stuName) <- students)
      printf("\tId: %d, Name: %s\n", stuId, stuName);
    
    students = students + (104 -> "Sumit")
    students = students + (105 -> "Kishan")
    
    println("Student Information After adding elements:");
    for ((stuId, stuName) <- students)
      printf("\tId: %d, Name: %s\n", stuId, stuName);
  }
}

Output

Student Information:
	Id: 101, Name: Amit
	Id: 102, Name: Arun
	Id: 103, Name: Anit
Student Information After adding elements:
	Id: 101, Name: Amit
	Id: 102, Name: Arun
	Id: 105, Name: Kishan
	Id: 103, Name: Anit
	Id: 104, Name: Sumit

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 a HashMap collection students. The students collection contains student id and student name. Then we added elements to the students HashMap using the "+" operator and printed the updated collection on the console screen.

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