Help with adding colors to signs

How would I make this into colored text on a sign?

Code:

        @SuppressWarnings("deprecation")
        public void onSignChange(SignChangeEvent event) {
            Player player = event.getPlayer();
            Block block = event.getBlock();
            Sign sign = null;
            Material type = block.getType();
            if (type.equals(Material.SIGN) || type.equals(Material.SIGN_POST) || type.equals(Material.WALL_SIGN)) {
                sign = (Sign) block.getState();
            } else {
                return;
            }
            String text[] = event.getLines();
            Block ChestB = event.getBlock().getFace(BlockFace.DOWN, 1);
            ContainerBlock chest = null;
            if (ChestB.getTypeId() == 54) {
                chest = (ContainerBlock) ChestB.getState();
            } else {
                return;
            }
            if (text[1].equalsIgnoreCase("[Trash]") && hasPermission(player, "pd.create")){
                player.sendMessage(ChatColor.LIGHT_PURPLE + "Disposal created!");
            } else {
                if (text[1].equalsIgnoreCase("[Trash]")){
                player.sendMessage(ChatColor.LIGHT_PURPLE + "You cannot make Disposals");
                player.getInventory().addItem(new ItemStack(323, 1));
                player.updateInventory();
                block.setTypeId(0);
                }
                return;
            }
            int x = block.getX();
            int y = block.getY();
            int z = block.getZ();
            y = y-1;
            try {
                BufferedWriter out = new BufferedWriter(new FileWriter("plugins/PrisonDisposal/ChestLocations.txt", true));
                out.write(+x + ";" +y + ";" +z);
                out.newLine();
                out.close();
            } catch (IOException e) {
            }
        }
        public Boolean hasPermission(CommandSender sender, String node) {
            if (!(sender instanceof Player)) return true;

            Player player = (Player) sender;
            if (Permissions != null) return Permissions.has(player, node);
            else {
                    Plugin test = plugin.getServer().getPluginManager().getPlugin("Permissions");
                    if (test != null) {
                            Permissions = ((Permissions) test).getHandler();
                            return Permissions.has(player, node);
                    }
            }
            return player.isOp();
    }
}

 

sign.setLine(<line number>, ChatColor.<Color> + "String");