Classes have multiple constructors i.e. you can instantiate them in different ways.
In below example, a car be created with make/model/year or just with make/model.
Take note of the class method dispCar and function dispCarDetails to display the information of a car.
import java.io._
class Car() {
var make: String = "";
var model: String = "";
var year: Int = 0;
var color = "";
def this(makeOfCar: String, modelOfCar: String, yearOfCar: Int) {
this()
println("Creating new car object per first constructor")
this.make = makeOfCar;
this.model = modelOfCar;
this.year = yearOfCar;
this.color = "Black";
}
def this(makeOfCar: String, modelOfCar: String) {
this()
println("Creating new car object per second constructor")
this.make = makeOfCar;
this.model = modelOfCar;
this.year = 1990;
this.color = "Blue";
}
def dispCar() {
println("Car details:" + this.make + " " + this.model + " " + this.year + " " + this.color)
}
}
object Demo {
def main(args: Array[String]) {
var car1 = new Car("Honda", "City", 1996);
var car2 = new Car("Honda", "Accord");
var car3 = new Car("Honda", "Amaze", 2015);
println("")
println("Displaying car info in main program:")
println("Car details:" + car1.make + " " + car1.model + " " + car1.year + " " + car1.color)
println("Car details:" + car2.make + " " + car2.model + " " + car2.year + " " + car2.color)
println("Car details:" + car3.make + " " + car3.model + " " + car3.year + " " + car3.color)
println("")
println("Displaying car info via function:")
dispCarDetails(car1)
dispCarDetails(car2)
dispCarDetails(car3)
println("")
println("Display car info via class func:")
car1.dispCar()
car2.dispCar()
car3.dispCar()
}
def dispCarDetails(car:Car) = {
println("Car details via func:" + car.make + " " + car.model + " " + car.year + " " + car.color)
}
}
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