Example Phone Book

PhoneBook.java

import java.util.*;
import java.io.*;

public class PhoneBook {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        Scanner contactNameReader = new Scanner(System.in);
        Scanner contactNumberReader = new Scanner(System.in);
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        ArrayList<Contact> contacts = new ArrayList<>();
        String again = "Y";
        int menu;

        while (again.equals("Y")) {
            System.out.print("\033[H\033[2J");
            System.out.println("My Phone Book");
            System.out.println("1. Daftar Kontak");
            System.out.println("2. Tambah Kontak");
            System.out.print("Masukkan pilihan anda : ");

            menu = reader.nextInt();

            switch (menu) {
                case 1:
                    System.out.print("\033[H\033[2J");
                    contacts.forEach((contact) -> {
                        System.out.printf("%-20s", contact.name);
                        System.out.printf("%-20s", contact.number);
                        System.out.println("");
                    });
                    break;
                case 2:
                    System.out.print("\033[H\033[2J");
                    System.out.print("Nama : ");
                    String name = contactNameReader.next();
                    System.out.print("Nomor : ");
                    String number = contactNumberReader.next();

                    contacts.add(new Contact(name, number));
                    break;
            }


            System.out.print("Kembali ke menu utama? (Y/T) : ");

            try {
                again = bufferedReader.readLine();
            } catch (IOException e) {

            }
        }
    }

    public static class Contact {
        String name;
        String number;

        public Contact(String name, String number) {
            this.name = name;
            this.number = number;
        }
    }
}