从ArrayList中基于数量移除重复项的正确方法

import java.util.ArrayList;
import java.util.Iterator;

class Item {
    private String name;
    private int quantity;

    public Item(String name, int quantity) {
        this.name = name;
        this.quantity = quantity;
    }

    public String getName() {
        return name;
    }

    public int getQuantity() {
        return quantity;
    }

    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }

    @Override
    public String toString() {
        return "Item{" +
                "name='" + name + '\'' +
                ", quantity=" + quantity +
                '}';
    }
}


public class ItemRemover {

    private ArrayList<Item> items;

    public ItemRemover(ArrayList<Item> items) {
        this.items = items;
    }

    public void removeNameQuantity(String name, int q) {
        int totalQ = items.stream()
                .filter(i -> name.equals(i.getName()))
                .mapToInt(Item::getQuantity)
                .sum();

        if (totalQ < q) {
            System.out.println("Insufficient quantity of " + name + "(s) available");
            return;
            // or throw some appropriate exception
        }

        for (Iterator<Item> it = items.iterator(); it.hasNext() && q > 0; ) {
            Item item = it.next();
            if (name.equals(item.getName())) {
                int iq = item.getQuantity();
                int deduction = Math.min(q, iq);
                item.setQuantity(iq - deduction);
                q -= deduction;
                if (item.getQuantity() == 0) {
                    it.remove();
                }
            }
        }
    }

    public static void main(String[] args) {
        ArrayList<Item> items = new ArrayList<>();
        items.add(new Item("Apple", 5));
        items.add(new Item("Banana", 3));
        items.add(new Item("Apple", 3));
        items.add(new Item("Orange", 2));
        items.add(new Item("Apple", 2));

        ItemRemover remover = new ItemRemover(items);

        System.out.println("Original List: " + items);

        remover.removeNameQuantity("Apple", 7);

        System.out.println("List after removing 7 Apples: " + items);

        remover.removeNameQuantity("Banana", 5); // Attempt to remove more bananas than available

        System.out.println("List after attempting to remove 5 Bananas: " + items);

        remover.removeNameQuantity("Orange", 2);
        System.out.println("List after removing 2 Oranges: " + items);
    }
}