Kotlin Type casting and conversion

Type casting is a process of converting one data type to another type, for example – converting int to long, long to double etc. In this tutorial we will learn how to do type conversion in Kotlin. In Kotlin the conversion is not automatic, we need to explicitly do the type conversion. Type cast objects using the is operator or its negated form !is to perform a runtime check that identifies whether an object conforms to a given type.

fun demo(x: Any) {
    if (x is String) {
        print(x.length) // x is automatically cast to String
    }
}

Kotlin Int to String using toString() function

.toString() returns a string representation of the object. It is not just restricted to converting Int to String. You can use it to convert other data type like Boolean to String.

fun main() {  
  var x = 10
  var y: String = x.toString()
  println(y)  
}

Output

Kotlin Int to Long using toLong() function

We use the toLong() function to convert int to long in Kotlin.

fun main() {  
  val num1: Int = 101
  val num2: Long = num1.toLong()
  println(num2)  
}

Output

101

Conclusion

In this page (written and validated by A. Gawali) you learned about Kotlin Type casting and conversion . What's Next? If you are interested in completing Kotlin tutorial, your next topic will be learning about: Kotlin String concatenation.

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