title: Check how many people are within a certain distance from the center
body: <p>I'm making a Spleef plugin.
  I need to count the amount of people in a lobby.</p>
  
  <p>I thought that I could count how many people are within a certain distance from the center of the lobby.
  I think that this may work better than recording when someone types the command.</p>
  
  <p><em>Main.java:</em></p>
  
  <pre><code>package me.olsyboy.spleef;
  
  import org.bukkit.Bukkit;
  import org.bukkit.ChatColor;
  import org.bukkit.Location;
  import org.bukkit.World;
  import org.bukkit.command.Command;
  import org.bukkit.command.CommandSender;
  import org.bukkit.entity.Player;
  import org.bukkit.plugin.java.JavaPlugin;
  import org.bukkit.configuration.file.YamlConfiguration;
  
  import java.util.Arrays;
  import java.util.List;
  
  public class Main extends JavaPlugin {
      public void onEnable(int amountOfPlayers) {
          amountOfPlayers = 0;
          loadConfiguration();
          reloadConfig();
      }
  
      public void onDisable() {
          saveDefaultConfig();
      }
  
      public void loadConfiguration() {
          //See "Creating you're defaults"
          getConfig().options().copyDefaults(true); // NOTE: You do not have to use "plugin." if the class extends the java plugin
          //Save the config whenever you manipulate it
          saveDefaultConfig();
      }
  
      @Override
      public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
          Player player = (Player) sender;
          if (cmd.getName().equalsIgnoreCase("spleef")) {
              if (args[0].equalsIgnoreCase("setgame")) {
                  if (args.length == 2) {
                      String gameName = args[1]; //initialize the gameName variable here
                      getConfig().set("Game Locations." + gameName + ".Location", Arrays.asList(player.getLocation().getX(), player.getLocation().getY(), player.getLocation().getZ(), player.getLocation().getPitch(), player.getLocation().getYaw(), player.getLocation().getWorld().getName()));
                      getConfig().options().copyDefaults(true);
                      saveConfig();
                      player.sendMessage(ChatColor.AQUA + "[Spleef] " + ChatColor.YELLOW + "Spleef Game Location Set");
                  }
              }
              if (args[0].equalsIgnoreCase("join")) {
                  String gameName = args[1]; //initialize the gameName variable here
                  List&lt;String&gt; joinGameLocation = this.getConfig().getStringList("Game Locations." + gameName + ".Location");
                  String xPos = joinGameLocation.get(0);
                  double xPos2 = Double.parseDouble(xPos);
  
                  String yPos = joinGameLocation.get(1);
                  double yPos2 = Double.parseDouble(yPos);
  
                  String zPos = joinGameLocation.get(2);
                  double zPos2 = Double.parseDouble(zPos);
  
                  String pitch = joinGameLocation.get(3);
                  float pitch2 = Float.parseFloat(pitch);
  
                  String Yaw = joinGameLocation.get(4);
                  float Yaw2 = Float.parseFloat(Yaw);
  
                  World actualWorld = Bukkit.getWorld(joinGameLocation.get(5));
                  Location spleefGameLocation = new Location(actualWorld, xPos2, yPos2, zPos2);
                  spleefGameLocation.setPitch(pitch2);
                  spleefGameLocation.setYaw(Yaw2);
                  player.teleport(spleefGameLocation);
              }
              else if (!(args[0].equalsIgnoreCase("setgame"))) {
                  if (!args[0].equalsIgnoreCase("join")) {
                      player.sendMessage("/spleef join {GameName}");
                  }
              }
          }
          return true;
      }
  }
  </code></pre>
  
  <p><em>playerJoinedGame.java:</em></p>
  
  <pre><code>package me.olsyboy.spleef;
  
  public class playerJoinedGame extends Main {
      public void onPlayerJoin(int amountOfPlayers)
      {
          amountOfPlayers = amountOfPlayers + 1;
      }
  }
  </code></pre>
  
  <p>I have not called the <code>onPlayerJoin</code> method from the main class yet.</p>
  
  <p>I'm open to anyone having any better ways of counting the amount of people in a lobby.</p>