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Difference between "*" and "Any" in Kotlin generics
In any programming language, generics are a powerful feature using which developers can create custom data type to manipulate a program in a different manner. There are many ways in which we can define generics in Kotlin.
In this article, we will demonstrate the difference between "*" and "Any" keywords in Kotlin.
When we define a collection with "*", it should contain the object of only that type. There should not be any mix and match between the data types inside a collection.
If we use "Any", we can mix and match the data types, which means we can have multiple data types in a collection.
Example - usage of "*"
fun main(args: Array<String>) {
val num = arrayOf(1, 2, 3, 4)
ArrayUtil().findElement(num,2)
}
class ArrayUtil(){
// passing generic array to a function
fun findElement(array:Array<*>,element:Int){
for(i in array.indices){
if(array[i]==element){
println("Element found at " +i)
}
}
}
}Output
It will generate the following output:
Element found at 1
Example – Use of "Any"
fun main(args: Array<String>) {
var objet = genericsExample<String>("JAVA")
var objet1 = genericsExample<Int>(10)
}
class genericsExample<Any>(input:Any?) {
init {
println("I am getting called with the value "+input)
}
}Output
It will generate the following output
I am getting called with the value JAVA I am getting called with the value 10
Updated on: 23-Nov-2021
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