How to put Arraylist<object> as parameter in HashMap in Java?

Issue

I am doing a Java project - Budget manager, which shows how I spend my money. For that purpose, I used Hashmap to store the type of purchase with parameters of String(enum), and Arraylist<Product>. Product is a new class where name and price are to be passed.

Map<String, Arraylist<Product>> mapProducts = new HashMap<>();

Now I just can't figure out how to pass that array to Map.

 switch (choice) {
            case 1:
                mapProducts.put(Product.Type.FOOD.name(),//add array);
                break;
            case 2:
                mapProducts.put(Product.Type.CLOTHES.name(), );
                break;
            case 3:
                mapProducts.put(Product.Type.ENTERTAINMENT.name(), );
                break;
            case 4:
                mapProducts.put(Product.Type.OTHER.name(), );
                break;
        }

import java.util.*;


public class Account {


    private ArrayList<String> listOfPurchases;
    private ArrayList<Double> itemPrice;
    private ArrayList<Product> products;
    private double balance;
    private Scanner input = new Scanner(System.in);
    private Map<String, ArrayList<Product>> mapProducts = new HashMap<>();


    public Account() {
        this.listOfPurchases = new ArrayList<>();
        this.itemPrice = new ArrayList<>();
        this.balance = 0.00d;


    }


    public void mainMenuPrint() {
        System.out.println(
                "Choose your action:\n" +
                        "1) Add income\n" +
                        "2) Add purchase\n" +
                        "3) Show list of purchases\n" +
                        "4) Balance\n" +
                        "0) Exit");

    }


    public void startMenu() {

        Scanner input = new Scanner(System.in);


        boolean isOn = true;
        while (isOn) {
            mainMenuPrint();
            int choice = input.nextInt();
            switch (choice) {
                case 0:
                    System.out.println("Bye!");
                    isOn = false;
                    break;
                case 1:
                    addIncome();
                    break;
                case 2:
                    addPurchase();
                    break;
                case 3:
                    showPurchases();
                    break;
                case 4:
                    showBalance();
                    break;

            }
        }
    }

    public void addIncome() {

        double addMoney = 0.00d;
        System.out.println("Enter income:");

        addMoney = input.nextDouble();
        setBalance(addMoney);
        System.out.println("Income was added!");
        System.out.println("");


    }

    public void addPurchase() {

        System.out.println(
                "Choose the type of purchase\n" +
                        "1) Food\n" +
                        "2) Clothes\n" +
                        "3) Entertainment\n" +
                        "4) Other\n" +
                        "5) Back\n");

        int choice = input.nextInt();
        double price = 0.0d;
        if (choice == 5) {
            startMenu();
        } else {
            System.out.println("Enter purchase name:");
            String item = input.next();
            setListOfPurchases(item);

            System.out.println("Enter its price:");
            try {
                price = input.nextDouble();
                setItemPrice(price);
                balanceSubtractFromPurchasePrice(price);

            } catch (
                    InputMismatchException e) {
                System.out.println("Wrong input");
            }

            switch (choice) {
                case 1:
                    mapProducts.put(Product.Type.FOOD.name(),//add array);
                    break;
                case 2:
                    mapProducts.put(Product.Type.CLOTHES.name(), );
                    break;
                case 3:
                    mapProducts.put(Product.Type.ENTERTAINMENT.name(), );
                    break;
                case 4:
                    mapProducts.put(Product.Type.OTHER.name(), );
                    break;
            }


            System.out.println("");

        }
    }


    public void showPurchases() {

        double sum = 0.0d;

        if (mapProducts.size() == 0) {
            System.out.println("The purchase list is empty");


        } else {
            System.out.println(
                    "Choose the type of purchase\n" +
                            "1) Food\n" +
                            "2) Clothes\n" +
                            "3) Entertainment\n" +
                            "4) Other\n" +
                            "5) All\n" +
                            "6) Back\n");

            int choice = input.nextInt();


            for (Map.Entry<String, ArrayList<Product>> entry : mapProducts.entrySet()) {

                System.out.println(entry.getKey());
                System.out.println(mapProducts.get("FOOD").get(0));

            }

            for (int i = 0; i < listOfPurchases.size(); i++) {
                sum += itemPrice.get(i);
            }

            System.out.println("Total sum: $" + sum);

        }
        System.out.println("");
    }


    public void showBalance() {

        System.out.printf("Balance: $%.2f", getBalance());
        System.out.println("");
        System.out.println("");
    }


    public void setBalance(double balanceAmount) {
        this.balance += balanceAmount;
    }

    public void balanceSubtractFromPurchasePrice(double purchasePrice) {
        this.balance -= purchasePrice;
    }

    public double getBalance() {
        if (balance < 0) {
            System.out.println("Balance is negative ");
        }
        return this.balance;
    }


    public void setListOfPurchases(String item) {
        this.listOfPurchases.add(item);
    }

    public ArrayList<String> getListOfPurchases() {
        return listOfPurchases;
    }

    public ArrayList<Double> getItemPrice() {
        return itemPrice;
    }

    public void setItemPrice(double itemPrice) {
        this.itemPrice.add(itemPrice);
    }
}

public class Product {

    enum Type {
        FOOD,
        CLOTHES,
        ENTERTAINMENT,
        OTHER;

    }

    private String name;
    private double price;
    private Scanner input = new Scanner(System.in);


    public Product(String name, double price) {
        this.name = name;
        this.price = price;


    }


    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }


}

Thanks for the help!

Solution

Instead of saving name and price in two separate list just create a product and place it directly into the map using computeIfAbsent.

System.out.println("Enter purchase name:");
String item = input.next();
System.out.println("Enter its price:");
try {
    price = input.nextDouble();
    balanceSubtractFromPurchasePrice(price);
    // Lazy replacement for complicated switch case.
   if(choice >= 1 && choice <= 4) {
       Product.Type productType = Product.Type.values()[choice - 1];
       Product product = new Product(item, price);
       List<Product> products = mapProducts.computeIfAbsent(productType, k -> new ArrayList<>());
       products.add(product);
    } else {
        System.out.println("Wrong input");
    }
    } catch (InputMismatchException  e) {
        System.out.println("Wrong input");
    }
    System.out.println("");
}

Answered By - magicmn