Program Kantin Java - OOP (Object Oriented Programming)

/*
* author : mochamad Rifai Idris
* Nim  : 10.41010.0153
* Program : KantinJava
*/
import java.io.*;
class KantinJava
{
 public static void main (String []args)
 throws IOException
 {
  BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
  Menu menu = new Menu();
  String AdminUser;
  System.out.print("Admin/User : ");
  AdminUser = br.readLine();
  menu.setAdmin(AdminUser);
  menu.Cetak();

 }
}

-------------------------------------------end program------------------------------

import java.io.*;
import java.util.Vector;
class Menu
{
 //Menu menu = new Menu();
 private String AdminUser;
 private int pil=0;

 public void setAdmin(String AdminUser)
 {
  this.AdminUser = AdminUser;
 }
  
 public String getAdmin()
 {
  return AdminUser;
 }

 void Cetak()
 throws IOException
 {
  BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
  //do
  //{
   Transaksi transaksi = new Transaksi();
   if (getAdmin().equalsIgnoreCase("admin"))
   {
    do
    {
     System.out.println("++++++++++++++++++++++++++++++++++");
     System.out.println("Menu Transaksi");
     System.out.println("++++++++++++++++++++++++++++++++++");
     System.out.println("1. Add Makanan");
     System.out.println("2. Update Makanan");
     System.out.println("3. Penjualan Makanan");
     System.out.println("4. View All Makanan");
     System.out.println("5. View All Transaksi");
     System.out.println("6. Keluar");
     System.out.print("Masukan Pilihan Anda : " );
     pil = Integer.parseInt(br.readLine());
     System.out.println();
     
     if (pil==1)
     {
      transaksi.InputMakanan();
     }
     else if (pil==2)
     {
      transaksi.UpdateMakanan();
     }
     else if (pil==3)
     {
      transaksi.PesananMakanan();
     }
     else if (pil==4)
     {
      transaksi.LaporanMakanan();
     }
     else if (pil==5)
     {
      transaksi.LaporanTransaksi();
     }
     else if(pil==6)
     {
      System.exit(0);
     }
    
    }
    while (pil!=6);
    

   }
   else if (getAdmin().equalsIgnoreCase("user"))
   {
    transaksi.PesananMakanan();
   }
   else if (getAdmin().equalsIgnoreCase("exit"))
   {
    System.exit(0);
   }
   else
   {
    System.out.println("user tidak dikenali");
   }
  //}
  //while (!(getAdmin().equals("admin")));
 }
}

--------------------------------------------end program--------------------------

import java.io.*;
class Transaksi
{
 private int [] IdMakanan = new int [1000];
 private String [] NamaMakanan = new String [1000];
 private int [] HargaMakanan = new int [1000];

 private int [] IdTransaksi = new int [1000];
 private int [] IdPesanan = new int [1000];
 private int [] JumlahPesanan = new int [1000];
 private int [] TotalPesanan = new int [1000];

 private int id=0;
 private int id2=0;
 private int cari=0;
 private String InputMakanan;
 
 void cari()
 {

 }

 void InputMakanan()
 throws IOException
 {
  BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
  while (true)
  {
   System.out.print("Input Data Makanan (y/n) : ");
   InputMakanan = br.readLine();
   if (InputMakanan.equals("n"))
   {
    break;
   }
   else
   {
    id = id + 1;
    System.out.println("No Makanan : " + id);
    IdMakanan [id] = id;
    System.out.print("Nama Makanan : ");
    NamaMakanan [id] = br.readLine();
    System.out.print("Harga Makanan : ");
    HargaMakanan[id] = Integer.parseInt(br.readLine());
   }
   System.out.println();
  }
 }
 
 void UpdateMakanan()
 throws IOException
 {
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  {
   System.out.println("Data Sebelum Diupdate");
   LaporanMakanan();
   System.out.println();
   System.out.print("Masukan No. Id dari Makanan yang Ingin Dirubah : ");
   int RubahId = Integer.parseInt(br.readLine());
    
   for (int i=1; i<=id; i++)
   {
    if (IdMakanan[i] == RubahId)
    {
    System.out.print("Nama Makanan : ");
    NamaMakanan [RubahId] = br.readLine();
    System.out.print("Harga Makanan : ");
    HargaMakanan [RubahId] = Integer.parseInt(br.readLine());
    System.out.println("Data Sesudah Diupdate");
    LaporanMakanan();  
    }
    else if (IdMakanan[i]!=RubahId)
    {
     if (i==id)
     {
      System.out.println("data tidak ada");
     }
    }
 
   }
  }
 }

 void LaporanMakanan()
  {
    System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++");
    System.out.println(" Data Makanan Warung Serba Murah     ");
    System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++");
    System.out.println("No Nama Makanan  Harga ");
    System.out.println("------------------------------------------------------");
    for (int a=1;a<=id;a++ )
    {
     System.out.println(IdMakanan[a]+" " + NamaMakanan[a]+"  "+HargaMakanan[a]);
    }
    System.out.println("------------------------------------------------------");
  }
  
  void LaporanTransaksi()
  {
    System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++");
    System.out.println("   Data Semua Transaksi     ");
    System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++");
    System.out.println("NoTransaksi No NamaMakanan Jumlah Harga Total");
    System.out.println("------------------------------------------------------");
    for (int a=1;a<=id2;a++ )
    {
     System.out.println(IdTransaksi[a]+"  " + IdPesanan[a]+" "+
     NamaMakanan[a]+" "+JumlahPesanan[a]+" "+HargaMakanan[a]+" "+TotalPesanan[a]);
    }
    System.out.println("------------------------------------------------------");
  }

 void PesananMakanan()
 throws IOException
 {
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  {
   LaporanMakanan();
   System.out.println();
   System.out.println("----Form Pemesanan Makanan----");
   while (true)
   {
    System.out.print("Apakah anda ingin memesan makan ? (y/n) :");
    String pesanan = br.readLine();
    if (pesanan.equals("n"))
    {
     //System.exit(0);
     break;
    }
    else
    {

     id2 = id2 + 1;
     System.out.println("No Transaksi : " + id2);
     IdTransaksi [id2] = id2;
     System.out.print("No. Makanan : ");
     IdPesanan [id2] = Integer.parseInt(br.readLine());
     System.out.println("Nama Makanan : " + NamaMakanan[IdPesanan[id2]]);
     System.out.println("Harga Makanan : " + HargaMakanan[IdPesanan[id2]]);
     System.out.print("Jumlah Pesan : ");
     JumlahPesanan [id2] = Integer.parseInt(br.readLine());
     System.out.println("Total Harga : " +
     (JumlahPesanan[id2]*HargaMakanan[IdPesanan[id2]]));
     TotalPesanan [id2] = (HargaMakanan[id2]*HargaMakanan[IdPesanan[id2]]) ;
    }
   System.out.println();
   }
  }
 }
}