Hi Friend,

Try the following code:

import java.util.*;

class Product{
public String item;
public int quantity;
public double price;
public double total;

public Product(){}
public Product(String item,int quantity, double price,double total) {
super();
this.item=item;
this.quantity= quantity;
this.price = price;
this.total=total;
}
public String getItem() {
return item;
}
public int getQuantity() {
return quantity;
}
public double getPrice() {
return price;
}
public double getTotal() {
return total;
}
}
public class BuyProducts {

public static void main(String[] args) throws Exception {
double sum=0.0;
List<Product> list = new ArrayList<Product>();
Scanner scan = new Scanner(System.in);
int menu = 0;
System.out.println("School Registration System Main Menu");
System.out.println();
System.out.println("1. Ikan masin");
System.out.println("2. Garam Masala");
System.out.println("3. Buttercup");
System.out.println("4. Mentega ");
System.out.println("5. Honey");
System.out.println("6. Customer Bill");
System.out.println("7. Exit");

boolean quit = false;
do{
System.out.print("Please enter your choice: ");
menu = scan.nextInt();
System.out.println();

switch(menu) {
case 1:
System.out.print("Quantity: ");
int q1 = scan.nextInt();
System.out.print("Price: ");
double p1 = scan.nextDouble();
double t1=p1*q1;
list.add(new Product("Ikan masin",q1,p1,t1));
break;
case 2:
System.out.print("Quantity: ");
int q2 = scan.nextInt();
System.out.print("Price: ");
double p2 = scan.nextDouble();
double t2=p2*q2;
list.add(new Product("Garam Masala",q2,p2,t2));
break;
case 3:
System.out.print("Quantity: ");
int q3 = scan.nextInt();
System.out.print("Price: ");
double p3 = scan.nextDouble();
double t3=p3*q3;
list.add(new Product("Buttercup",q3,p3,t3));
break;
case 4:
    System.out.print("Quantity: ");
int q4 = scan.nextInt();
System.out.print("Price: ");
double p4 = scan.nextDouble();
double t4=p4*q4;
list.add(new Product("Mentega",q4,p4,t4));break;
case 5:
System.out.print("Quantity: ");
int q5 = scan.nextInt();
System.out.print("Price: ");
double p5 = scan.nextDouble();
double t5=p5*q5;
list.add(new Product("Honey",q5,p5,t5));break;
case 6:
quit = true;
System.out.println("Items   Quantity   Price   Total");
for (Product s : list){
System.out.println(s.getItem()+"        " +s.getQuantity()+"        "+s.getPrice()+"        " +s.getTotal());
 sum+=s.getTotal();
}
System.out.print("Customer pays: ");
double pay=scan.nextDouble();
if(pay>sum){
    double amt=pay-sum;
    System.out.println("Give Change to Customer: "+amt);
}
else{
    System.out.println("You have to pay "+sum);
    System.out.print("Enter amount to pay:");
     pay=scan.nextDouble();
}
break;
case 7:
    quit=true;
break;
default:
System.out.println("Invalid Entry!");
 }
}
while(!quit);
}
}

Thanks

thanks!!! you really helpful!!!