How to remove index from ArrayList and print total integer of the removed index?

I want to make a program for a warehouse. emptyStock() method should remove the food that has been sold from the list. print() method should print all list of food and total food (kg) that has been sold.

public class Lists {
private String name;
private String category;
private int amount;
public Lists(String name, String category, int amount) {
this.name = name;
this.category = category;
this.amount = amount;
}
public String toString() {
return name + " is " + category + " and we have " + amount + " in warehouse";
}
}
public class Food {
ArrayList<Lists> Food = new ArrayList<>();
public void add(String name, String category, int amount) {
Food.add(new Lists(name, category, amount));
}
public void emptyStock(int index) {
Food.remove(index);
}
public void print() {
for (Lists lists : Food) {
System.out.println(lists);
}
}
public static void main(String[] args) {
Food food = new Food();
food.add("Potato", "Vegetable", 35);
food.add("Carrot", "Vegetable", 15);
food.add("Apple", "Fruit", 30);
food.add("Kiwi", "Fruit", 5);
food.emptyStock(1);
food.emptyStock(2);
food.print();
System.out.print("");
}
}

The output needs to print something like this:

Potato is Vegetable and we have 35 kg in warehouse
Apple is Fruit and we have 30 kg in warehouse
20 kg of food has been sold! // my code cannot print this part

I am still not sure how to make print() method prints the total amount (kg) of food that has been removed from the list.

Just add a class member (in class Food) that stores the total amount removed. In method emptyStock() you update the value of this member. In the below code, I added the member removed.

import java.util.ArrayList;

public class Food {
    int removed;
    ArrayList<Lists> foods = new ArrayList<>();

    public void add(String name, String category, int amount) {
        foods.add(new Lists(name, category, amount));
    }

    public void emptyStock(int index) {
        removed += foods.get(index).getAmount();
        foods.remove(index);
    }

    public void print() {
        for (Lists lists : foods) {
            System.out.println(lists);
        }
        System.out.printf("%d kg of food has been sold!%n", removed);
    }

    public static void main(String[] args) {
        Food food = new Food();
        food.add("Potato", "Vegetable", 35);
        food.add("Carrot", "Vegetable", 15);
        food.add("Apple", "Fruit", 30);
        food.add("Kiwi", "Fruit", 5);
        food.emptyStock(1);
        food.emptyStock(2);
        food.print();
        System.out.print("");
    }
}

class Lists {
    private String name;
    private String category;
    private int amount;

    public Lists(String name, String category, int amount) {
       this.name = name;
       this.category = category;
       this.amount = amount;
    }

    public int getAmount() {
        return amount;
    }

    public String toString() {
        return name + " is " + category + " and we have " + amount + " in warehouse";
    }
}

Output when running above code is:

<!-- language: lang-none -->

Potato is Vegetable and we have 35 in warehouse
Apple is Fruit and we have 30 in warehouse
20 kg of food has been sold!