Code:/** * Adding Ban IP **/ public static void addIpToBanList(String IP) { bannedIps.add(IP); } /** * Removing Ban IP **/ public static void removeIpFromBanList(String IP) { bannedIps.remove(IP); } /** * Contains Ban IP **/ public static boolean isIpBanned(String IP) { if(bannedIps.contains(IP)) { return true; } return false; } public static void banIps() { try { BufferedReader in = new BufferedReader(new FileReader("./Data/bans/IpsBanned.txt")); String data = null; try { while ((data = in.readLine()) != null) { addIpToBanList(data); } } finally { in.close(); } } catch (IOException e) { e.printStackTrace(); } }