Scala program to print iterate HashMap collection using the for loop

Program/Source Code:

The source code to print iterate HashMap using the for loop is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Scala program to iterate 
// HashMap collection using "for" loop

import scala.collection.mutable._

object Sample {
  // Main method
  def main(args: Array[String]) {
    var students = HashMap(("101", "Amit"), ("102", "Arun"), ("103", "Anit"))
    var employees = HashMap((1001, "Akash"), (1002, "Vikas"), (1003, "Prakash"))

    println("Student Information:");
    for ((stuId, stuName) <- students)
      printf("\tId: %s, Name: %s\n", stuId, stuName);

    println("Employee Information:");
    for ((empId, empName) <- employees)
      printf("\tId: %d, Name: %s\n", empId, empName);
  }
}

Output:

Student Information:
	Id: 101, Name: Amit
	Id: 102, Name: Arun
	Id: 103, Name: Anit
Employee Information:
	Id: 1001, Name: Akash
	Id: 1002, Name: Vikas
	Id: 1003, Name: Prakash

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 HashMap collections students and employees. The students collection contains student id and student name. The employees collection contains employee id and employee name. After that, we printed both collections on the console screen.