VendingMachine.java

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import java.util.ArrayList;
 
public class VendingMachine {
    // ArrayList of Integers represents inserted coins in Coin Slot
    private ArrayList<Integer> insertedCoins;
    
    // ArrayList of Product represents inventories of products
    private ArrayList<Product> products;
 
    public VendingMachine() {
        insertedCoins = new ArrayList<Integer>();
        products = new ArrayList<Product>();
    }
 
    public void addProduct(Product p) {
        products.add(p);
    }
    
    public void insertCoin(Integer c) {
        insertedCoins.add(c);
    }
    
    /* You may add other properties and methods */
 
    // utility methods
    public void removeCoin(Integer c) {
        insertedCoins.remove(c);
    }
 
    public void dumpAllCoins() {
        insertedCoins.clear();
    }
 
    public void deductProductQuantity(Product p) {
        p.setQuantity(p.getQuantity() - 1);
    }
 
    // getters
    public ArrayList<Integer> getInsertedCoins() {
        return insertedCoins;
    }
 
    public ArrayList<ArrayList<Integer>> getGroupedInsertedCoins() {
        ArrayList<ArrayList<Integer>> coins_list = new ArrayList<ArrayList<Integer>>();
        for (int i = 0; i < 4; i++) {
            coins_list.add(new ArrayList<Integer>());
        }
        for (Integer c : insertedCoins) {
            if (c == 1) {
                coins_list.get(0).add(c);
            } else if (c == 2) {
                coins_list.get(1).add(c);
            } else if (c == 5) {
                coins_list.get(2).add(c);
            } else if (c == 10) {
                coins_list.get(3).add(c);
            }
        }
        return coins_list;
    }
 
    public int getTotalInsertedCoinsAmount() {
        int total = 0;
        for (Integer c : insertedCoins) {
            total += c;
        }
        return total;
    }
 
    public Product getProduct(String name) {
        for (Product p : products) {
            if (p.getName().equals(name)) {
                return p;
            }
        }
        return null;
    }
}