Java Program On Retail Shop Billing

Title - retail outlet

Details - 

Customer's name and phone number should be entered.

A welcome message will be displayed.

The product names (at least 12 product ) will be displayed. ( given previously to the program along with prices during the quantity for one each product. ) 

Shopkeeper produces a bill by typing product name .

The bill must display the following 

A bill number.

Name of the shop.

Name and phone number of the customer.

GST amount ( 18% of total amount ) 

Total amount ( calculated as sum of price of all products)

import java.util.*;

 class RetailOutlet

 {

     double amt=0;

     int i,pc,x=0;

     long phoneno;

     String name,s,item;

     char ch;

     String product[]={"A","B","C","D","E","F","G","H","I","J","K","L"};

     String bill[]=new String[15];

     double rate[]={10.5,20,25,30,12.5,22,23,30,14.5,21,21,31};

     /* Set the item names and price properly*/

     Scanner sc=new Scanner(System.in);

     void takeData()

     {

         

         System.out.print("\nEnter Name:");

        name=sc.nextLine();        

        System.out.print("\nEnter Phone Number:");

         phoneno=sc.nextLong();

System.out.print("\nWelCome :" + name + " Phone Number: "+phoneno);

         

        } 

        void sellItems()

        {

            System.out.print("\nHere Is List Chart of Items of GOPAL STORES\n");

            for(i=0;i<12;i++)

            System.out.print("\n"+product[i]+ "  Rate:  "+rate[i]);

            ch='y';

            while(ch!='n')

            {

               sc=new Scanner(System.in);

               System.out.print("\nItem Name: "); 

               item=sc.nextLine();

               for(i=0;i<12;i++)

               {

                   if(item.equalsIgnoreCase(product[i]))

                   break;

                }

                if(i==12)

                System.out.print("\nEnter Item Name Properly ");

                else

                {

                     System.out.print("\nHow many Pcs: ");

                      pc=sc.nextInt();

                     s=item + " Price Per Unit: "+ rate[i]+ " " + pc+ " Pcs. " + " Total Rs.: " + rate[i]*pc;

                     bill[x++]=s;

                     amt=amt+rate[i]*pc;

                }

                 System.out.print("\nAny More Item, Press 'n' to produce the Final Bill otherwise 'y' ");   

                    ch=sc.next().charAt(0);

                    ch=Character.toLowerCase(ch);

                    sc=null;

                }

                

                s="Gross Bill Rs.: " + (amt- amt*18/100);

                     bill[x++]=s;

                     s="GST Rs.: " + amt*18/100;

                     bill[x++]=s;

                     s="Payable Amount Rs.: " + amt;

                     bill[x++]=s;         

            

        }

        void display()

        {

           System.out.print("\n GOPAL STORES\n"); 

            System.out.println("Customer: "+name); 

           System.out.println("Phone Number: "+phoneno); 

           for(i=0;i<x;i++)

           System.out.println(bill[i]);

        }

        public static void main(String args[])

        {

            RetailOutlet obj=new RetailOutlet();

            obj.takeData();

            obj.sellItems();

            obj.display();

        }

    }