Notes

import java.io.*;
import java.util.Scanner;
import java.util.StringTokenizer;
public class Que3 {

public static void main(String[] args) throws FileNotFoundException {
String week;
double thisweek;
double totalSales = 0;
double highestSale;
double lowestSale;
int highestSaleWeek=0;
int lowestSaleWeek=0;
int weekNum=0;
File f = new File("E:\SalesData.txt");
Scanner sales = new Scanner(f);
// Reading and displaying info of Fist week starts here
String firstweek = sales.nextLine();
weekNum++;
thisweek= removeAndAdd(firstweek);
highestSale=lowestSale=thisweek;
totalSales+=thisweek;
System.out.println("Total Sales for week "+weekNum+" is: "+ thisweek );
System.out.println("Average Sales for week "+weekNum+" is: "+(thisweek/7));
System.out.println("");
// Reading and displaying info of first week ends here

while(sales.hasNextLine()) {
week = sales.nextLine();
weekNum++;
thisweek= removeAndAdd(week);
if(thisweek>highestSale) {
highestSale=thisweek;
highestSaleWeek=weekNum;
}

if(thisweek<lowestSale) {
lowestSale=thisweek;
lowestSaleWeek=weekNum;
}

totalSales+=thisweek;
System.out.println("Total Sales for week "+weekNum+" is: "+ thisweek );
System.out.println("Average Sales for week "+weekNum+" is: "+(thisweek/7));
System.out.println("");
}
System.out.println("Total Sales for All week is: "+totalSales);
System.out.println("Average weekly sales is:"+totalSales/weekNum);
System.out.println("Highest Amount of sales is of week "+highestSaleWeek);
System.out.println("Lowest Amount of sales is of week "+lowestSaleWeek);


}

public static double removeAndAdd(String week) {
double sum=0;
StringTokenizer st = new StringTokenizer(week,",");
while(st.hasMoreTokens()) {
double num = Double.parseDouble(st.nextToken());
sum+=num;
}
return sum;
}

}