bebas

package com.company;
import javax.jws.soap.SOAPBinding;
import java.util.Scanner;
import java.util.ArrayList;


public class Main {
    static class User {
        String nama, username, password;
        int publickey;
    }

    static class percakapan {
        int publickeyuser, publickeytarget;
        String percakapanuser, percakapantarget;
    }

    static int generatekey(ArrayList<User> userArray) {
        int range = (1000 - 100) + 1;
        int random = (int) (Math.random() * range) + 100;
        for (User dataUser : userArray) {
            if (dataUser.publickey == random)
                random = (int) (Math.random() * range) + 100;
        }
        return random;
    }

    static boolean checkValidation(ArrayList<User> userArray, String username, String password) {
        for (User dataUser : userArray) {
            if (dataUser.username.equals(username) && dataUser.password.equals(password)) {
                return true;
            }
        }
        return false;
    }


    public static void main(String[] args) {
        Scanner Ais = new Scanner(System.in);
        ArrayList<User> arrayUser = new ArrayList<>();
        ArrayList<percakapan> arraypercakapan = new ArrayList<>();
        User user = new User();
        boolean selesai = false;
        while (!selesai) {
            System.out.println("===========================================");
            System.out.println("||                                       ||");
            System.out.println("||              Whatsapp                 ||");
            System.out.println("||                                       ||");
            System.out.println("===========================================");
            System.out.println("1. REGISTRATION");
            System.out.println("2. LOGIN");
            System.out.println("3. EXIT");
            System.out.println("-------------------------------------------");
            System.out.print("PILIH : ");
            int pilih = Ais.nextInt();
            switch (pilih) {
                case 1:
                    Ais.nextLine();
                    System.out.print("Masukkan Nama\t: ");
                    user.nama = Ais.nextLine();
                    System.out.print("Masukkan Username\t: ");
                    user.username = Ais.next();
                    System.out.print("Masukkan Password\t: ");
                    user.password = Ais.next();
                    System.out.print("Ulangi Password\t: ");
                    String passwordUlang = Ais.next();
                    user.publickey = generatekey(arrayUser);
                    System.out.println("Public Key Anda\t: " + user.publickey);
                    if (user.password.equals(passwordUlang)) {
                        arrayUser.add(user);
                        System.out.println("User Berhasil ditambah");
                    } else {
                        System.out.println("Password dan password ulang tidak cocok");
                    }
                    break;
                case 2:
                    System.out.print("Username\t: ");
                    String username = Ais.next();
                    System.out.print("Password\t: ");
                    String password = Ais.next();
                    if (checkValidation(arrayUser, username, password)) {
                        boolean isiLogin = true;
                        String pengguna = "";
                        int public_key=0;
                        for (User dataUser : arrayUser) {
                            if (dataUser.username.equalsIgnoreCase(username)) {
                                pengguna = dataUser.nama;
                                public_key=dataUser.publickey;
                            }
                        }
                        while (isiLogin) {
                            System.out.println("Selamat Datang " + pengguna);
                            System.out.println("=======================================");
                            System.out.println("1. Chat");
                            System.out.println("2. My History Chat");
                            System.out.println("3. Logout");
                            System.out.print("Pilih : ");
                            int pilihCase2 = Ais.nextInt();
                            switch (pilihCase2) {
                                case 1:
                                    for (int i = 0; i < arrayUser.size(); i++) {
                                        System.out.println((i + 1) + ". " + arrayUser.get(i).nama + " [" + arrayUser.get(i).publickey + "]");
                                    }
                                    System.out.println("pilih : ");
                                    int pilih_chat = Ais.nextInt();

                                    if (pilih_chat >= 1 && pilih_chat <= arrayUser.size()) {
                                        boolean end = true;
                                        System.out.println("[" + arrayUser.get(pilih_chat - 1).publickey + "]");
                                        while (end) {
                                            System.out.println("User :" + arrayUser.get(pilih_chat - 1).nama);
                                            System.out.print("Chat   :");
                                            String chat = Ais.next();
                                            System.out.println("User :" + arrayUser.get(pilih_chat - 1).nama);
                                            System.out.print("Chat   :");
                                            String chat_target = Ais.next();
                                            percakapan percak =new percakapan();
                                            percak.percakapantarget=chat_target;
                                            percak.publickeytarget=arrayUser.get(pilih_chat-1).publickey;
                                            percak.percakapanuser=chat;
                                            percak.publickeyuser= public_key;
                                            arraypercakapan.add(percak);
                                            if (chat_target.equalsIgnoreCase("end")) {

                                                end = false;
                                            }
                                        }
                                    } else {
                                        System.out.println("User yang dipilih tidak valid!!!!!!!!!!!!");
                                    }
                                    break;

                                case 2:
                                    for (int i = 0; i <arraypercakapan.size() ; i++) {
                                        System.out.println(arraypercakapan.get(i).percakapanuser);
                                    }
                                    break;
                                case 3:

                                    break;
                            }

                        }

                    }
                    break;
                case 3:
                    break;
                default:
            }
        }
    }
}