I need the following java code commented

import java.util.Scanner;

public class Main {

public static void main(String[] args) { Scanner input = new Scanner (System.in); int productNo=0; double product1; double product2; double product3; double product4; double product5; int quantity; double totalsales=0; while(productNo !=0) System.out.println("Enter Product Number 1-5"); productNo=input.nextInt(); System.out.println("Enter Quantity Sold"); quantity=input.nextInt(); switch (productNo) { case 1: product1=1.00; totalsales+=(1.00*quantity); break; case 2: product2=2.00; totalsales+=(2.00*quantity); break; case 3: product3=6.00; totalsales+=(6.00*quantity); break; case 4: product4=23.00; totalsales+=(23.00*quantity); break; case 5: product5=17.00; totalsales+=(17.00*quantity); break; } System.out.println(totalsales); } }