Using the vault as support for prefix suffix?

Using the vault as support for prefix suffix?
'm new to java and I want to solve this question
this class

1. package net.MoreCraft.MoreChat.Chat;
2. import net.MoreCraft.MoreChat.MoreChat;
3. import net.MoreCraft.MoreChat.Settings.Config;
4. import org.bukkit.Bukkit;
5. import org.bukkit.ChatColor;
6. import org.bukkit.command.Command;
7. import org.bukkit.command.CommandExecutor;
8. import org.bukkit.command.CommandSender;
9. import org.bukkit.entity.Player;
10. public class CommandChatGlobal implements CommandExecutor {
11. public CommandChatGlobal(MoreChat moreChat) {
12. }
13. public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {
14. if (!(sender instanceof Player)) {
15. sender.sendMessage("Esse comando pode ser usado somente no jogo!");
16. return true;
17. }
18. Player player = (Player) sender;
19. if (cmd.getName().equalsIgnoreCase("global")) {
20. if (!player.hasPermission("MoreCraft.MoreChat.User.Chat.Global")) {
21. Config.noPermissionMessage(player);
22. return true;
23. }
24. try {
25. StringBuilder x = new StringBuilder();
26. int i;
27. for (i = 0; i < args.length; i++) {
28. x.append(args + " ");
29. }
30. if (args.length > 0) {
31. Bukkit.getServer().broadcastMessage(ChatColor.GRAY + "【" + ChatColor.GREEN + ChatColor.BOLD + "G" + ChatColor.GRAY + "】"+ ChatColor.RESET + player.getDisplayName() + ": " + ChatColor.GRAY + x.toString().trim());
32. } else {
33. player.sendMessage(ChatColor.RED + "Erro!");
34. player.sendMessage(ChatColor.RED + "Uso: /" + commandLabel + " <mensagem>");
35. }
36. } catch (Exception e) {
37. player.sendMessage(ChatColor.RED + "Erro!");
38. player.sendMessage(ChatColor.RED + "Uso: /" + commandLabel + " <mensagem>");
39. }
40. } else if (args.length < 1) {
41. player.sendMessage(ChatColor.RED + "Erro!");
42. player.sendMessage(ChatColor.RED + "Uso: /" + commandLabel + " <mensagem>");
43. }
44. return true;
45. }
46. }