Nickname plugin

Hi guys I starter some days ago making a nickname plugin. Everything was ok but when I tested to use the nick it didn't work for the chat and the nametag!
Only on tablist worked and I tried to fix it but I couldn't. Can you help me?

Code:

                            if(player.hasPermission("evolution.nick") || player.isOp()) {
                                player.setDisplayName(args[0].replace("&", "§"));
                                player.setDisplayName(args[1].replace("&", "§"));
                                player.setPlayerListName(args[1].replace("&", "§"));
                                Main.getMain().setNick(player, args[1]);
                                player.sendMessage(prefix + ChatColor.GREEN + "You updated you nick to " + ChatColor.GOLD + ChatColor.translateAlternateColorCodes('&', args[1]));
                            }
                        }else if(args.length == 3){
                            if(player.hasPermission("evolution.nick.other") || player.isOp()){
                                Player c = Bukkit.getPlayer(args[2]);
                                if(c != null){
                                    c.setDisplayName(args[1].replace("&", "§") + ChatColor.RESET);
                                    c.setPlayerListName(args[1].replace("&", "§"));
                                    Main.getMain().setNick(c, args[1]);
                                    c.sendMessage(prefix + ChatColor.GOLD + player.getName() + ChatColor.GREEN + " setted your nickname to " + ChatColor.AQUA + args[1] + ChatColor.GREEN + "!");
                                    player.sendMessage(prefix + ChatColor.GREEN + "You have changed " + ChatColor.RED + c.getName() + "'s" + ChatColor.GOLD + " nick to " + ChatColor.translateAlternateColorCodes('&', args[1]));
                                }else{
                                    player.sendMessage(prefix + ChatColor.RED + "Cannot find player " + args[2] + "!");
                                }
                            }
                        }
                    }

It has more but these work fine!
can you help me how to add nickname for chat and for nametag?

 

Not sure if this is the best way, but what if you were to store the player's nickname within a configuration file and then when they speak check if they have a nickname if so when they talk replace their name with their custom nickname? I do not have much experience with nick names but that might work for what you are trying. Also other things I would like to mention is the way you go about your way of setting these nicknames -

First of all why are you setting the person's display as argument zero and then after you set their display name to argument one?
That simply makes player.setDisplayName(args[0].replace("&", "§")); useless!

Code:

player.setDisplayName(args[0].replace("&", "§"));
player.setDisplayName(args[1].replace("&", "§"));

Also organisation is very well a needed within your plugin, why not make one simple method for a simple nickname change -

Code:

public void nicknamePlayer(Player player, String nick) {

    String nickname = ChatColor.translateAlternateColorCodes('&', nick);
    player.setDisplayName(nickname);
    player.setPlayerListName(nickname);
    player.sendMessage(ChatColor.GREEN + "Your nickname has been changed to " + nickname);

    //Store nickname within a configuration
    //When the player talks retrieve their nickname if it's valid
      and then replace their name when they talk with the actual nickname
}

Also for changing a player’s name above their head it’s possible but correct me if I am wrong @timtower it’s not very well supported ? However I did run into this, this nay be of help to what you’re trying to do - https://bukkit.org/threads/change-player-name-tags-once-again.444702/

 

if ill do this it wont save the nicknames!

 

Well of course it doesn't, I am not going to make your plugin for you. If you are having issues with these simple tasks (such as making a nickname method, storing data within a configuration, and replacing a player's name when they speak) I would suggest having a good knowledge of Java and Bukkit before attempting to code.