Display the name and quantity of the item which was sold the most,

import java.awt.Frame;
import java.io.*;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.List;
import java.util.TreeMap;


import java.awt.*;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JSeparator;

public class Gunstore{

	
	public static void main(String[] args) throws IOException {
		int maincontrol=0;
		double discount=0.1;//currently 10% discount per purchase
		double tax=0.17;//current 17% tax oer purchase
		 int quantity=0;
		String highitem = null;
		 double hq = 0;
		 String shq=null;
		
		
		String accessboss="admin";
		String accessclerk="clerk";
		String passboss="admin";
		String passclerk="clerk";
		 String user;
		 String pass="";
		 JOptionPane.showMessageDialog(null, "D. S. C. D ™ "
				 +"\n\n\n" +"Please Login for Access.");
		//  user=JOptionPane.showInputDialog(null,"UserName: ");//admin+user
		 //pass=JOptionPane.showInputDialog(null,"Password: ");//admin
		//if(user.equals(accessboss)  && pass.equals(passboss)){
		while(maincontrol==0){
		String salesinfo="Sales Information.txt";
		File salesfile= new File(salesinfo);
		Calendar currentDate = Calendar.getInstance();
		String squantity = null;
		SimpleDateFormat formatter=  new SimpleDateFormat("yyyy/MMM/dd");
		String dateNow = formatter.format(currentDate.getTime());
		double total=0;
		String allstoresale = null;
		//int item = 0;
		//String pc = null;
		String itemname = null;
		double unitcost=0;
		//int sales = 0;
		//String prodcode=null;
       
	//JOptionPane.showMessageDialog(null, "Receive a 10% on purchases more than $3000 ");
		
		//String buy = null;
		String sunitcost;
		int imi=0,kal=0,tom=0,bus=0,g18=0,sw=0,ber=0,col=0,rev=0,des=0,mp5=0,c15=0;

		int count;
		String stotal = null;
String itemcode = null;

int menu=(Integer.parseInt(JOptionPane.showInputDialog("\t Logged in as: Manager" +"\n\n\n(1) \t to make a purchase\n" +"(2) \t Highest Sale for the day \n"
+"(3)\t Item that sold the most \n" 
+"(4)\t All Sales for day \n"+"(5)\t Display all Sales for the Store \n" 
+"(6)\t Manage discount or GCT \n" +"(0)\tExit \n")));


switch(menu){

case 0: System.exit(menu);

case 1:main1(salesfile,discount,tax,shq,highitem,hq,imi,kal,tom,bus,g18,sw,ber,col,rev,des,mp5,c15);
	maincontrol=0;
	break;

case 2:   highsale(total);
	maincontrol=0;
	break;
	
case 3:
	
maincontrol=0;
break;

case 4: 
	
	
case 5: allstoresale(salesfile);
maincontrol=0;
break;

case 6: setdiscount( discount,tax );
		maincontrol=0;
		break;
		 

}
		}//}
		//else if(user.equals(accessclerk) && pass.equals(passclerk)){
			
			while(maincontrol==0){
				String salesinfo="Sales Information.txt";
				File salesfile= new File(salesinfo);
				Calendar currentDate = Calendar.getInstance();
				String squantity = null;
				SimpleDateFormat formatter=  new SimpleDateFormat("yyyy/MMM/dd");
				String dateNow = formatter.format(currentDate.getTime());
				double total=0;
				//int item = 0;
				//String pc = null;
				String itemname = null;
				double unitcost=0;
				//int sales = 0;
				//String prodcode=null;
			
		       
			//JOptionPane.showMessageDialog(null, "Receive a 10% on purchases more than $3000 ");
				
				//String buy = null;
				String sunitcost;
		
		
				int count;
				String stotal = null;
		String itemcode = null;
		int imi=0,kal=0,tom=0,bus=0,g18=0,sw=0,ber=0,col=0,rev=0,des=0,mp5=0,c15=0;
		int menu=(Integer.parseInt(JOptionPane.showInputDialog("\t Logged in: Sales Clerk" +"\n\n\n(1) \t to make a purchase\n"  +"(0)\tExit \n")));


		switch(menu){

		case 0: System.exit(menu);

		case 1:main1(salesfile,discount,tax,shq,highitem,hq,imi,kal,tom,bus,g18,sw,ber,col,rev,des,mp5,c15);
			maincontrol=0;
			break;
				 
		default:
				JOptionPane.showMessageDialog(null, "You donot have Access Loser!");
				maincontrol=0;
				break;
		}
			
				
			}
		}
	
		
public static void highsale(double total){
	double temp=0;
	double high = 0;
	  NumberFormat formatterx = new DecimalFormat("#0.00");
	if(total>temp){
		high=total;
	}
	else{
		JOptionPane.showMessageDialog(null, "There has not been a Sale as yet!");
	}
	
	JOptionPane.showMessageDialog(null, "Highest Sale for Today is: " +formatterx.format(high));

}


 
private static void allstoresale(File salesfile) throws IOException {
	String displaysales;
	try{
		FileReader fr = new FileReader(salesfile);
		BufferedReader br = new BufferedReader(fr);

		while((displaysales = br.readLine()) != null){
		System.out.println(displaysales);
		
		}

	}catch(IOException ioe){
		System.out.println(ioe);
	}
}


public static double setdiscount(double discount, double tax){
	int ans=0;
	double xdis;
	double xtax;
	int ans1=0;
	JOptionPane.showMessageDialog(null,"The Current Discount is at:   "  +discount+"%   per total purchase totaling more than $3000 ");
	ans=Integer.parseInt(JOptionPane.showInputDialog(null,"Do you wish to enter new discount price? (Press a number)"));
while(ans>=0){
		xdis=Double.parseDouble(JOptionPane.showInputDialog("Enter new Discount in '%' "));
		xdis=(xdis*0.01);
		discount=xdis;
		JOptionPane.showMessageDialog(null,"The New discount is set @  "  +discount+"%   per total purchase totaling more than $3000 ");
		ans=-4;
}JOptionPane.showMessageDialog(null,"The Current Tax is at:   "  +tax +"%   per purchase ");
		ans1=Integer.parseInt(JOptionPane.showInputDialog(null,"Do you wish to enter new Tax? (Press a number)"));
		while(ans>=0){
			xtax=Double.parseDouble(JOptionPane.showInputDialog("Enter new Tax in '%'  "));
			xtax=(xtax*0.01);
			tax=xtax;
			JOptionPane.showMessageDialog(null,"The New discount is set @  "  +xtax+"%   per total purchase totaling more than $3000 ");
		}		
		
		JOptionPane.showMessageDialog(null,"\n New Discount= " +discount  +"\n New Tax(GCT)= " +tax);
	return discount;
	//}
	
	//return discount;

}
public static int[] main1(File salesfile,double discount,double tax,String shq,String highitem,double hq,int sig,int imi,int kal,int tom,int g18,int sw,int ber,int c19,int rev,int des,int mp5,int c15){
	Calendar currentDate = Calendar.getInstance();
	String squantity = null;
	SimpleDateFormat formatter=  new SimpleDateFormat("yyyy/MMM/dd");
	String dateNow = formatter.format(currentDate.getTime());
	//String highitem = null;
	double total=0;
	//double discount=0.1;//customers receive a 10% discounts on purchases totaling to more than $3000

	String itemname = null;
	double unitcost=0;
	
    int quantity=0;
  
//JOptionPane.showMessageDialog(null, "Receive a 10% on purchases more than $3000 ");

    NumberFormat formatterx = new DecimalFormat("#0.00");
	String sunitcost;



String itemcode = null;

int c =0;
while(c==0){
	 int value=(Integer.parseInt(JOptionPane.showInputDialog( 
	"`````^^Handguns^^`````\n\n"
	+"(1)   Desert eagle -price: $1300.00 \n\n"
	+"(2)   Revolver - price: $424.99 \n\n"
	+"(3)   Colt 1911 - price: $1229.99 \n\n"
	+"(4)   Smith & Wesson - price: $699.99 \n\n"
	+"(5)	Sig p226 - price: 568.00  \n\n"
	+"(6)	Beretta M9 9mm-code: price:$ 580.00 \n\n"
	+"(7)	Glock 18  -price: $779.99 \n\n"
	+"	\n`````^^Sub-Machine Guns^^````` \n\n"  
	+"(8)	HK Mp5 - price: $1300.00 \n\n"
	+"(9)	Bushmaster Carbon 15  -price :$1880.95  \n\n"
	+"(10)	IMI mini-UZI  price:$899.99   \n\n"	
	+"(11)	Kalashnikov AK-12 fff -price $6100.00   \n\n"
	+"(12)	M1 Thompson(Tommy Gun) -price: $15000.00  \n\n"
	+"\n"
	+"(0)\t Return to Main Menu")));  

	 int count[]=new int[11];


	switch(value){ 
	
	case 1:		itemname="Desert eagle";
				itemcode="deag";
				unitcost=1300.00;
				quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
				squantity=""+quantity;
				JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);
				des++;
				count[0]=count[0]+1;
				
				c=1;
				
				break;
		
	case 2:		
				itemname="Revolver";
				unitcost=429.99;
				itemcode="revl";
				quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
				squantity=""+quantity;
				JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);
				rev++;
				count[1]=count[1]+1;
				c=1;
				break;
	case 3:
					itemname="Colt 1911";
					unitcost=1229.99;
					itemcode="c191";
					quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
					squantity=""+quantity;
					count[2]=count[2]+1;
					JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);
					c=1;
					c19++;
					break;
	case 4:	
				itemname="Smith & Wesson";
				unitcost=699.99;
				itemcode="swes";
				quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
				squantity=""+quantity;
				JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);	
				count[3]=count[3]+1;
				sw++;
				break;
	case 5:
					itemname="Sig p226 ";
					unitcost=1300.00;
					itemcode="sp22";
					quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
					squantity=""+quantity;
					JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);	
					count[4]=count[4]+1;
					sig++;
					break;
	case 6:
							itemname="Beretta M9 9mm";
							unitcost=580.00;
							itemcode="bm9";
							quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
							squantity=""+quantity;
							JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);	
							ber++;
							c=1;
							count[5]=count[5]+1;
							break;
	case 7:
						itemname="Glock 18";
						unitcost=779.99;
						itemcode="G18";
						quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
						squantity=""+quantity;
						JOptionPane.showMessageDialog(null,"You've purchased:   "+itemname);	
						g18++;
						c=1;
						count[6]=count[6]+1;
						break;
	case 8:
							itemname="HK Mp5";
							unitcost=1300.00;
							itemcode="Hmp5";
							quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
							squantity=""+quantity;
							JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);
							mp5++;
							c=1;
							count[7]=count[7]+1;
							break;
	case 9:
								itemname="Bushmaster Carbon 15";
								unitcost=1880.95;
								itemcode="Bc15";
								quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
								squantity=""+quantity;
								JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);	
								c15++;
								c=1;
								count[8]=count[8]+1;
								break;
	case 10:
								itemname="IMI mini-UZI";
								unitcost=899.99;
								itemcode="Iuzi";
								quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
								squantity=""+quantity;
								JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);	
								imi++;
								c=1;
								count[9]=count[9]+1;
								break;
	case 11:
								itemname="Kalashnikov AK-12";	
								unitcost=1880.95;
								itemcode="Ak12";
								quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
								squantity=""+quantity;
								JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);			
								kal++;
								c=1;
								count[10]=count[10]+1;
								break;
								
	case 12:					itemname="M1 Thompson (Tommy Gun)";
								unitcost=1880.95;
								itemcode="Tgun";
								quantity = (Integer.parseInt(JOptionPane.showInputDialog(null, "How many Units of:  " +itemname)));
								squantity=""+quantity;
								JOptionPane.showMessageDialog(null, "You've purchased:   "+itemname);	
								tom++;
								c=1;
								count[11]=count[11]+1;
								break;
								
	case 0:						c=1;
								//maincontrol=0;
								break;
								
		
	default:
			JOptionPane.showMessageDialog(null,"Invalid please retry");
			//System.exit(c);
			c=0;
			break;
	}	

double untaxed;
	 
		unitcost=(unitcost+(unitcost*tax));
	 total=(unitcost*quantity);
		total=(total-(total*discount));
		untaxed=(total+(total*tax));
		String stotal = ""+total;
		sunitcost=""+unitcost;
		JOptionPane.showMessageDialog(null, "Your Current Untaxed Balance:    $"+formatterx.format(untaxed));
		JOptionPane.showMessageDialog(null, "Your Total Balance(including a  " +tax +"%   in payable GCT"    +"$"+formatterx.format(total));
	
		
		try{
		
			FileWriter fw = new FileWriter(salesfile,true);
			BufferedWriter bw = new BufferedWriter(fw);
			fw.write("	Product: "+itemname+"\t");
			fw.write("\t\t");
			fw.write("ItemCode: "+itemcode+"\t");
			fw.write("\t\t");
			fw.write("Unitcost: " +sunitcost+"\t");
			fw.write("\t\t\t");
			fw.write("Quantity: " +squantity+"\t");
			fw.write("\t\t");
			fw.write("Date of Purchase:" +dateNow);

			fw.write("\n");
			fw.write("\n");
			bw.close();
			fw.close();
			
		}catch(IOException ioe){
			System.out.println(ioe);
		}
		
		int record=JOptionPane.showConfirmDialog(null, "Do you  want to make another purchase ");
		if(record==JOptionPane.YES_OPTION){
			c=0;
			}
		else if(record==JOptionPane.NO_OPTION)
			{c=1;
			JOptionPane.showMessageDialog(null,"Thanks for purchasing a: " +itemname);
			}
		else System.exit(c);
		}

return new int[12];
		
}

}