I've this code :

```
val total = ListMap[String,HashMap[Int,_]]
val hm1 = new HashMap[Int,String]
val hm2 = new HashMap[Int,Int]
...
//insert values in hm1 and in hm2
...
total += "key1" -> hm1
total += "key2" -> hm2

....

val get = HashMap[Int,String] = total.get("key1") match {
  case a : HashMap[Int,String] => a
}

```

This work, but I would know if exists a better (more readable) way to do this.
Thanks to all !