Death message enable/disable

Helloooo i wanted to know how it could be possible to make a command enable/disable death messages to only that player.

EXAMPLE

Me: /dm enable
I see: lalaguy98 killed xXDevastationXx with a stone sword!

Other guy: /dm disable
They see: nothing

Dont give me the entire code, i just want hints to learn

 

You could use a hasmap that stores the player's name or id and whether they have it enabled or not.
Use the command to toggle it, and check the hashmap in the event.

 

@Laekh @xXDevastationXx A better idea would be to use a HashSet<UUID> which is faster and there's no point in using a hashmap if the value is just a boolean.

 

I stand corrected.
I'll blame it on it being 5 am

 

@pie_flavor

Explain how a HashSet is faster than a HashMap, when a HashSet is simply a HashMap with empty buckets.

In reality it makes no difference.

 

Im not the best with hashmaps/hashsets, can I see an example? (Sorry im not good with reading learning, i like to see it)

 

@xXDevastationXx

Code:

public static void main(String[] args) {
    Map<String, Integer> map = new HashMap<String, Integer>();
    map.put("Stuff", 3);
    System.out.println(map.get("Stuff"));
}