购买的物品总数

我一直在尝试创建一个方法来添加用户购买的所有物品，但找不到正确的代码。我已经制作了一个程序，可以打印用户想要购买的商品，但我似乎找不到合适的代码来添加所有商品的价格

     Scanner in = new Scanner(System.in);
      boolean loopAgain = true;
      boolean cont = true;

     ArrayList<String> food = new ArrayList<>(); 
          food.add("Pizza"); 
          food.add("Burger"); 
          food.add("Fries"); 
          food.add("Taco");

      ArrayList<Integer> cost = new ArrayList<>();
      cost.add(160);
      cost.add(35);
      cost.add(25);
      cost.add(30);
      
      ArrayList<String> quant = new ArrayList<>();
    
      while(loopAgain) {
     System.out.print("Beverage Available: ");
     
     for(int i=0; i<4; i++) {
         System.out.print(food.get(i)+ " = "+cost.get(i)+" ");
         if(i<food.size()-1)
             System.out.print("");
     }
         // user input
     System.out.print("\nPurchase Beverage: ");
     String c = in.nextLine();
     
     if(c.equalsIgnoreCase("pizza")) {
         quant.add(food.get(0) + "\t" + cost.get(0));
     }
     else if(c.equalsIgnoreCase("burger")) {
         quant.add(food.get(1) + "\t" + cost.get(1));
     }
     else if(c.equalsIgnoreCase("fries")) {
         quant.add(food.get(2) + "\t" + cost.get(2));
     }
         else if(c.equalsIgnoreCase("taco")) {
         quant.add(food.get(3) + "\t" + cost.get(3));
         }
         else {
         System.out.println("-Invalid-");
         }
    
     System.out.print("\nDo you want to add more? Yes or No? ");
     String yn = in.nextLine();
     
     if(yn.equalsIgnoreCase("yes")) {
         loopAgain = true;
         cont = false;
     }
     else if(yn.equalsIgnoreCase("no")) {
        loopAgain = false;
        cont = false;
     }
     else {
     System.out.println("-Invalid-");                
     }
      } 

     **// this is to display the items purchased**
    System.out.println("\n>>Amount to pay<<\n");
        for(int s=0; s<quant.size(); s++) {
    System.out.println(quant.get(s));   
    
     }  

这是我迄今为止所做的。它不添加所显示项目的价格，而是只添加数组列表成本中给出的价格。

    int sum = 0;
    for(int total:cost) {
    System.out.println("Total Amount: " + sum);
    sum = sum + total;
       }
     }
    }

我无法调用arraylist quant，因为它是字符串。如何添加用户购买的物品的价格？