Main.java

package com.company;

import java.io.*;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

public class Main {
    static String[] id;

    public static void main(String[] args) {
        int idSize = 200;
        id = new String[idSize];
        String mstudentId, mLname, mFname, moccup, mGender, mcountryCode, mareaCode, mphoneNum;
        boolean loop = false;
        int x;
        Scanner input = new Scanner(System.in);
        char ans;
        int counter = 0;
        int choice;
        int pil;
        boolean running = true;
        boolean run = true;
        boolean runner = true;
        String newID;

        phonebook Abook[] = new phonebook[500];

        do {
            System.out.println("[1] Store Asean phonebook\n[2] Edit Entry in ASEAN\n[3] Search Asean phonebook by country\n[4] Exit\n\n");

            System.out.println("Enter A Choice");
            choice = input.nextInt();
            input.nextLine();


            switch (choice) {
                case 1:
                    boolean checkId = false;
                    do {
                        System.out.println("Enter Student Number : ");
                        mstudentId = input.nextLine();
                        if (counter >= 1) {
                            for (int i = 0; i < id.length; i++) {
                                if (mstudentId.equals(id[i])) {
                                    checkId = true;
                                    break;
                                }
                            }
                        } else {
                        }
                        id[counter] = mstudentId;
                        if (checkId) {
                            System.err.println("\n\nThe ID is Already Registered \n\n");
                            break;
                        }

                        System.out.println("Enter Surname : ");
                        mLname = input.nextLine();
                        System.out.println("Enter First Name : ");
                        mFname = input.nextLine();
                        System.out.println("Enter Occupation : ");
                        moccup = input.nextLine();
                        System.out.println("Enter Gender (M for male, F for female) : ");
                        mGender = input.nextLine();
                        System.out.println("Enter your Country Code : ");
                        mcountryCode = input.nextLine();
                        System.out.println("Enter Area Code : ");
                        mareaCode = input.nextLine();
                        System.out.println("Enter Number : ");
                        mphoneNum = input.nextLine();
                        System.out.println("Do you want to enter another entry [Y/N]? : ");
                        ans = input.nextLine().charAt(0);
                        Abook[counter] = new phonebook(mstudentId, mLname, mFname, moccup, mGender, mcountryCode, mareaCode, mphoneNum);
                        counter++;

                        if (ans != 'Y') {
                            run = false;
                        }


                    } while (run);
                    break;
                case 2:
                    System.out.println("Which of the following information do you wish to change? : ");
                    newID = input.nextLine();
                    for (x = 0; x < counter; x++) {
                        if (newID.equals(Abook[x].mstudentId)) {
                            do {
                                System.out.println("\n\nHere is the existing information about " + Abook[x].mstudentId + ":");
                                System.out.println(Abook[x].mFname + " " + Abook[x].mLname + "\n is a " + Abook[x].moccup + " His number is " + Abook[x].mphoneNum);
                                System.out.println("\n\n Which of the following you want to edit?\n");

                                System.out.println("[1] Student Number\n[2] Surname\n[3] Gender\n[4] Occupation\n[5] Country code\n[6] Area Code\n[7] Phone Number\n[8] Non- Go back to main menu\n");
                                System.out.println("Enter a choice : ");
                                pil = input.nextInt();
                                input.nextLine();

                                switch (pil) {
                                    case 1:
                                        do {
                                            for (x = 0; x < counter; x++) {
                                                System.out.println("Enter a new Student ID");
                                                newID = input.nextLine();
                                                Abook[x].mstudentId = newID;
                                                if (newID.equals(Abook[x].mstudentId)) {
                                                    System.err.println("Already Exist");
                                                    loop = true;
                                                    break;
                                                } else if (newID != Abook[x].mstudentId) {
                                                    Abook[x].mstudentId = newID;
                                                    loop = false;
                                                }
                                            }


                                        } while (loop);
                                        break;
                                    case 2:
                                        System.out.println("Enter a new Last Name");
                                        newID = input.nextLine();
                                        Abook[x].mLname = newID;
                                        break;
                                    case 3:
                                        System.out.println("Enter new Gender");
                                        newID = input.nextLine();
                                        Abook[x].mGender = newID;
                                        break;
                                    case 4:
                                        System.out.println("Enter a new occupation");
                                        newID = input.nextLine();
                                        Abook[x].moccup = newID;
                                        break;
                                    case 5:
                                        System.out.println("Enter a new Country Code");
                                        newID = input.nextLine();
                                        Abook[x].mcountryCode = newID;
                                        break;
                                    case 6:
                                        System.out.println("Enter a new Area Code");
                                        newID = input.nextLine();
                                        Abook[x].mareaCode = newID;
                                        break;
                                    case 7:
                                        System.out.println("Enter a new phone Number");
                                        newID = input.nextLine();
                                        Abook[x].moccup = newID;
                                        break;
                                    case 8:

                                        runner = false;
                                        break;

                                    default:
                                        System.out.println("Invalid Keyword");


                                } //closing sa switch case 2


                            } while (runner);//closing sa do sa case 2


                        }
//if closing brace

                    }
//closing sa for loop
                    break;

                case 3:

                    String input1 = "Search ASEAN phonebook by country \n\n\n";
                    System.out.println(input1.toUpperCase());
                    System.out.println("[1] Phillipines [2] Thailand [3] Singapore [4] Indonesia [5] Malaysia [6] All [0] None");
                    System.out.print("Enter choice : ");
                    pil = input.nextInt();
                    input.nextLine();
                    switch (pil) {
                        case 1:
                            break;
                        case 2:
                            break;
                        case 3:
                            break;
                        case 4:
                            break;
                        case 5:
                            break;
                        case 6:
                            break;
                        case 0:
                            break;
                    }
                    break;
                case 4:
                    System.exit(0);
                    break;
            }

        } while (running);


    }
    public static class phonebook {
        public String mstudentId;
        public String mLname;
        public String mFname;
        public String moccup;
        public String mGender;
        public String mcountryCode;
        public String mareaCode;
        public String mphoneNum;

        public phonebook(String mstudentId, String mLname, String mFname, String moccup, String mGender, String mcountryCode, String mareaCode, String mphoneNum) {
            this.mstudentId = mstudentId;
            this.mLname = mLname;
            this.mFname = mFname;
            this.moccup = moccup;
            this.mGender = mGender;
            this.mcountryCode = mcountryCode;
            this.mareaCode = mareaCode;
            this.mphoneNum = mphoneNum;
        }
    }
}