Vending machine made with Java (domain driven)

Background

Based on the advice from shiracamus, I rewrote it in a DDD (domain driven) manner. At that time, we also reviewed some of the logic to make it simpler.

Processing flow

-Instance generation ・ Product list initialization (inventory replenishment) ・ Product list display (display of displayed products) ・ Product selection (input by user) ・ Deposit (input by user) ・ Sales (billing process) ・ Change (refund processing)

Operation image

Source code

Main.java

package vm;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        //Instance generation
        Store venderMachine = new Store();
        @SuppressWarnings("resource")
        Scanner scanner = new Scanner(System.in);

        //Product list initialization
        Product water = new Product("water", 80);
        Product coke = new Product("Cola", 100);
        Product orangejuice = new Product("Orange juice", 120);
        venderMachine.addStock(water);
        venderMachine.addStock(coke);
        venderMachine.addStock(orangejuice);

        //Product list display
        System.out.println("≪It is a product for sale≫");
        venderMachine.showProductList();

        //Product selection
        Product purchase = null;
        String purchaseSelectMessage = "Please enter the name of the product you want to purchase.";
        int purchaseSelectCount = 0;
        do {
            if(purchaseSelectCount > 0) {
                purchaseSelectMessage = "The product is not available. Please choose from the products on sale.";
            }

            System.out.println();
            System.out.println(purchaseSelectMessage);
            purchase = venderMachine.inStocker(scanner.next());
            purchaseSelectCount++;
        } while(!venderMachine.isExistsStock(purchase));


        //payment
        String depositMessage = "Please make a deposit.";
        int depositCount = 0;
        do {
            if(depositCount > 0) {
                depositMessage = "The deposit amount is insufficient. Please add the shortfall.";
            }

            System.out.println();
            System.out.println(depositMessage);
            venderMachine.addDeposit(scanner.nextInt());
            depositCount++;
        } while(!venderMachine.isEnoughDeposit(purchase));

        //Sale
        System.out.println();
        venderMachine.sale(purchase);

        //change
        System.out.println();
        venderMachine.change();
    }
}

Store.java

package vm;

public class Store {
    private Stocker stocker;
    private Casher casher;

    Store() {
        stocker = new Stocker();
        casher = new Casher();
    }

    void addDeposit(int deposit) {
        casher.addDeposit(deposit);
    }

    void addStock(Product product) {
        stocker.add(product);
    }

    void change() {
        System.out.println("Change is" + casher.change() + "It is a circle.");
    }

    void showProductList() {
        stocker.showProductList();
    }

    boolean isExistsStock(Product product) {
        return stocker.isExistsProduct(product);
    }

    boolean isEnoughDeposit(Product purchase) {
        return casher.isEnoughDeposit(purchase);
    }

    Product inStocker(String productName) {
        return stocker.getProduct(productName);
    }

    void sale(Product purchase) {
        casher.charge(purchase);
        System.out.println(purchase.name() + "is!");
        System.out.println("Thank you for your purchase.");
    }

}

Casher.java

package vm;

public class Casher {
    private int deposit;
    private int change;

    Casher(){
        deposit = 0;
        change = 0;
    }

    void addDeposit(int deposit) {
        this.deposit += deposit;
    }

    void charge(Product purchase) {
        change = deposit - purchase.price();
    }

    int change() {
        return change;
    }

    public boolean isEnoughDeposit(Product product) {
        if(deposit >= product.price()) {
            return true;
        }
        return false;
    }

}

Stocker.java

package vm;

import java.util.ArrayList;
import java.util.List;

public class Stocker {
    private List<Product> productList;

    Stocker() {
        productList = new ArrayList<>();
    }

    void add(Product product) {
        productList.add(product);
    }

    void showProductList() {
        for(Product product: productList) {
            System.out.println(product.info());
        }
    }

    boolean isExistsProduct(Product product) {
        for(Product stock: productList) {
            if(stock.name().equals(product.name())){
                return true;
            }
        }
        return false;
    }

    Product getProduct(String productName) {
        for(Product stock: productList) {
            if(stock.name().equals(productName)){
                return stock;
            }
        }
        return new Product();
    }

}

Product.java

package vm;

public class Product {
    private String productName;
    private int price;

    Product(String productName, int price) {
        this.productName = productName;
        this.price = price;
    }

    Product() {
        this.productName = "";
        this.price = 0;
    }

    String name() {
        return productName;
    }

    int price() {
        return price;
    }

    String info() {
        String formatStr = "%s : %d yen";
        return String.format(formatStr, productName, price);
    }

}