Help! Check if an player exist in an arraylist and deny a command.

I think it would be easier for you if you change the ban command.

 

Yeah this is and better idea! Let your class implement "CommandExecutor" and do it like this:

Code (Text):

public class BanCommand implements CommandExecutor{

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if (sender instanceof Player) {
            Player p = (Player) sender;
            if (cmd.getName().equalsIgnoreCase("ban")) {
                if (freezer.contains(p.getName())) {
                    p.sendMessage(Utils.prefix + ChatColor.RED + "You don't have permissions to execute this command.");
                }
            }
        }
        return false;
    }
}

You also have to register the command in you main class in your onEnable():

Code (Text):

getCommand("ban").setExecutor(new BanCommand(), this);

 

Use not if cmd contains /ban, use if cmd startsWith

 

Use UUIDs instead of names.

 

Try debugging your arraylist by printing it to the console to check if the player's name is in the arraylist to begin with.