Collections

fun main(args: Array<String>) { 
    val numbers: MutableList<Int> = mutableListOf(1, 2, 3) //mutable List 
    val readOnlyView: List<Int> = numbers                  // immutable list 
    println("my immutable list--"+numbers)        // prints "[1, 2, 3]" 
    numbers.add(4) 
    println("my immutable list after addition --"+numbers)        // prints "[1, 2, 3, 4]" 
    println(readOnlyView)     
    readOnlyView.clear()    // -> does not compile  
// gives error  
}