Alternate way of inserting the values in map?

[john sal]

Map<String,List<Object>> map = new HashMap<String, List<Object>>()

Now for inserting the values I am doing the following check:

if(map.get(value) == null) {
   //map.put("string","List<Object>");
}else{
  map.get(value).add("add the object in the list");
}

is there any alternate way of doing the same in order to avoid the if check because if check is only valid once for each key map is containing and until the key not present in the map. Once the map contains the key the if check will no longer valid.

[Raymond Tong]

Guava - ArrayListMultimap may be useful for you.

[Rob Spoor]

And if you don't want or can't add that library, I always use the following:

List<Object> list = map.get(key);
if (list == null)
{
    list = new ArrayList<Object>();
    map.put(key, list);
}
list.add(value);

[john sal]

Thanks Rob ...

[Rob Spoor]

You're welcome.