Kotlin Constructors

Constructor of class are used to initialize and set primary values of data member. kotlin is support two type of constructor. primary and secondary constructor.

Primary constructor

//example of primary constructor
class Mobile(var type:String, var price:Float){
 fun getInfo(){
     println(" type : $type  and price $price")
 }
}
fun main(args: Array){
    //set class data member values
	var smart=Mobile("Smart Phone",10000f)
    var basic=Mobile("Basic Phone",2000f)
   	smart.getInfo()
    basic.getInfo()
}

Output

Type : Smart Phone  Price : 10000.0
Type : Basic Phone  Price : 2000.0

Secondary constructor

class Mobile{
  var type:String
  var price:Float
  //constructor of class
  constructor(typeInfo:String,priceAmount:Float) {
      type=typeInfo
      price=priceAmount
  }
  fun itemData(){
      println("Type : $type  Price : $price")
  } 
  
}
fun main(args: Array<String>){
    //set class data member values
	var smart=Mobile("Smart Phone",10000f)
    var basic=Mobile("Basic Phone",2000f)
    smart.itemData()
    basic.itemData()
}

Output

Type : Smart Phone  Price : 10000.0
Type : Basic Phone  Price : 2000.0