[Help] How do I check who on the server is in a certain GameMode!

So... I am having a HUGE brainfart. This is driving me insane, so insane, that I am resorting to the bukkit forums for help (No offense ) - Anyways, I am running a minigame that is based off of Gamemodes, and the only way to win, is to be the last person alive with the Adventure mode. I have tried every single possibility to fetch for all online players, and get the last player in that gamemode. Below, I am going to paste some example code (DOES NOT WORK) to give you a better idea of what I'm attempting to do:

Code:java

//Get the online players
for (Player online : getServer().getOnlinePlayers()) {
 
    //Check to see how many online players are in adventure mode
    if (online.getGameMode(GameMode.ADVENTURE).length == 1) {
 
        //Set the players gamemode to survival (The minigame events only work if
        //you are in adventure, so by changing to survival it doesn't let the
        //events reach the player)
        online.setGameMode(GameMode.SURVIVAL);
 
        //Broadcast that the player won the game
        Bukkit.broadcastMessage("Player has won the game!")
 
        //Shut down server that then runs a script that connects back to bungee
        //and restarts the server with a clean map
        getServer().shutdown();
 
}
 
}

 

Do you get any errors in the console? Possibly not from what I can see, but I'm not omniscient, do you have any errors showing up?

 

No, that was a made up method. I wrote that to show an example of what I want it to do, because I do not know the method, therefore, I am getting no errors in console

 

if (online.getGameMode(GameMode.ADVENTURE).length == 1) {
wat.

Code:

for(Player online : getServer().getOnlinePlayers()){
    List<Player> survivors = new ArrayList<Player>();
    if(online.getGameMode() == Gamemode.ADVENTURE){
        survivors.add(online);
    }
    if(survivors.size() = 1){
       //winner!
      Player winner = survivors.get(0);
    }
    survivors.clear();
}

 

AWESOME thank you! And also: if (online.getGameMode(GameMode.ADVENTURE).length == 1) { - that was an example of what I wanted it to do, because I didn't know the method , but thank for your help!