Switch structure HELp!!!

Question

     Really nid help in this probelm...dont know how to use switch and Text Field please help ...
Mail order house sells 5 different product..prod1-$2.98, prod2-$4.50, prod3- $9.98, prod4- $4.49 and prod 5- $6.87..Write an application that reads a series of pairs of numbers as follows:
a)Product number
b)Quantity sold for one day
Program should use a switch structure to help determine the retail price for each product.Your program should calculate and display total retail value of all product sold last week. Use a TextField to obtaimn the product number from the user. Use sentinel -controlled loop to determine when the product should stop looping and display final results.
.....Help will ne greatly appreciate guys..Ive been doing this for 2 days..dont know where to place diffrent controls...send source code if possible thank you..

Answer 1

class Sale{
   double total=0;  //total sales
public int addSale(int product,int amount){ //amount is the num of product saled
    switch(product){
       case 1: total+=(2.98*amount);
               break;
       case 2: total+=(4.50*amount);
               break;
       case 5: total+=(6.87*amount);
               break;
       default:System.out.println("no such product!");
               break;
}