以通用对象为参数的函数

Question

How to create method that takes generic object as parameter? Like object of class Apple or Cycle . I don't want to downcast it from Any .

fun putObject(y: <T> /*and even only "T"*/) {
}

Answer 1

According to the documentation :

Not only classes can have type parameters. Functions can, too. Type parameters are placed before the name of the function:

 fun <T> singletonList(item: T): List<T> { // ... }

You have to declare that T is a type parameter. You have to do it before the name of the function (like you would in Java). Rewriting your code as follows works:

fun <T> putObject(y: T) {
    // ...
}