Choose random key from Hashmap

Is there a way to chose a random key from a hashmap?

I have a hashmap with player as key and want to get a random player from the list,
I have a random number from 1 to the number of players in the hashmap

how do I get a random key from the hashmap?

 

bluegru
Don't store player objects, store their names instead.

And an answer to your question, something like this should work.

Code:

String randomName = someHashMap.keySet().get(new Random().nextInt(someHashMap.keySet().size()));

 

There is no

Code:java

HashMap.keySet().get();

 

bluegru
http://stackoverflow.com/questions/9919734/selecting-random-key-and-value-sets-from-a-map-in-java

 

bluegru
Whoops, sorry. I forgot that a Set doesn't have get() method. You could just turn the set into an array, and pick a random from that.

Code:

String randomName = someHashMap.keySet().toArray()[new Random().nextInt(someHashMap.keySet().toArray().length)];

edit: now that I think of it, the keySet could be anything, not just string, so make that an Object.

 

woked,
thx