Scala program to create an abstract class with the constructor

Program/Source Code:

The source code to create an abstract class with a data constructor is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Scala program to create an abstract class 
// with the constructor

abstract class Demo1(num1: Int, num2: Int) {
  def printValues();
}

class Demo2(num1: Int, num2: Int) extends Demo1(num1, num2) {
  def printValues() {
    printf("Num1: %d\n", num1);
    printf("Num2: %d\n", num2);
  }
}

object Sample {
  def main(args: Array[String]) {
    var obj = new Demo2(10, 20);

    obj.printValues();
  }
}

Output:

Num1: 10
Num2: 20

Explanation:

Here, we used an object-oriented approach to create the program. And, we created an object Sample.

Here, we created two classes Demo1 and Demo2. The Demo1 is an abstract class with a primary constructor, it contains an abstract method printValues(). Then we inherited the Demo1 class into the Demo2 class and implemented the printValues() method. And, we called the constructor of class Demo1 from the constructor of Demo2.

In the main() function, we created the object of the Demo2 class and called the primary constructor to initialize data members. After we called the printValues() method to print the values of num1 and num2 on the console screen.