Randomly get Half of the strings in a list.

Can someone help me with getting half the players (Strings) from a list??

Code:java

    public void pickRnadom(){
        int playerThatWillBePicked = ((inGamePlayers.size() >= 6) ? inGamePlayers.size()/2 : 1);
 
        Random random = new Random();
 
        for (String player1 : AlivePlayers){
 
            Player player = Bukkit.getPlayer(player1);
 
           //do stuff
        }
    }

 

You could shuffle AlivePlayers and pick those players from index 0 up.

 

I need help with that. I am experienced with Java but not with Random().

 

Collections.shuffle(AlivePlayers); will shuffle the collection - then just take out index 0 to, I guess, playerThatWillBePicked - 1.

You could also be fancier than that and create your own little shuffle-syntax.

Code:java

int playerThatWillBePicked = /* ... */;
Random random = new Random();
 
int index;
Player p;
for(int x = 0; x < playerThatWillBePicked; x++) {
 
    index = random.nextInt(AlivePlayers.size() - x);
    p = Bukkit.getPlayer(AlivePlayers.get(index));
 
    /*version 1 to switch with the last index*/
    String tmp = AlivePlayers.get(index);
    AlivePlayers.remove(index);
    AlivePlayers.add(tmp);
 
    /*version 2 to switch with the last index*/
    int lastIndex = AlivePlayers.size() - x - 1;
    String tmp = AlivePlayers.get(index);
    AlivePlayers.set(index, AlivePlayers.get(lastIndex));
    AlivePlayers.set(lastIndex, tmp);
}

 

Can I do this?

Code:java

 public void pickRandomTNT(){
int playerThatWillBePicked = ((inGamePlayers.size() >= 6) ? inGamePlayers.size()/2 : 1);
 
Random random = new Random();
 
String[] players = (String[]) AlivePlayers.toArray();
 
while (playerThatWillBePicked != 0){
int randomInt = random.nextInt(AlivePlayers.size());
TNTPlayers.add(players[randomInt]);
AlivePlayers.remove(randomInt);
playerThatWillBePicked--;
}
}/syntax]