Implement Hashmap with different value types in Kotlin

Question

Is it possible to have a hashmap in Kotlin that takes different value types?

I've tried this:

val template = "Hello {{world}} - {{count}} - {{tf}}"

val context = HashMap<String, Object>()
context.put("world", "John")
context.put("count", 1)
context.put("tf", true)

... but that gives me a type mismatch (apparantly "John", 1 and true are not Objects)

In Java you can get around this by creating types new String("John"), new Integer(1), Boolean.TRUE, I've tried the equivalent in Kotlin, but still getting the type mismatch error.

context.put("tf", Boolean(true))

Any ideas?

Answer 1

In Kotlin, Any is the supertype of all the other types, and you should replace Java Object with it:

val context = HashMap<String, Any>()
context.put("world", "John")
context.put("count", 1)
context.put("tf", true)

Answer 2

For new visitors,It can also be done with this

val a= hashMapOf<Any,Any>( 1 to Exception(), 2 to Throwable(), Object() to 33)

Where both keys and values can be of any type.