Моё первое дз

README.md

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-# Пустой репозиторий для работы с Java кодом в Android Studio

src/main/java/Calculator.java

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+import java.util.HashMap;
+
+public class Calculator {
+    private double productSum;
+    private final HashMap<Product, Integer> order = new HashMap<>();
+
+    public void addProduct (Product product, int quantity) {
+        if (order.containsKey(product)) {
+            int oldQuantity = order.get(product);
+            int newQuantity = oldQuantity + quantity;
+            order.put(product, newQuantity);
+        }else {
+            order.put(product, quantity);
+        }
+        productSum = calculate();
+    }
+
+    private double calculate() {
+        double sum = 0;
+        for (Product product : order.keySet()){
+            int quantity = order.get(product);
+            sum += product.price * quantity;
+        }
+        return sum;
+    }
+
+    public void showProduct(){
+        System.out.println("Список товаров: ");
+        for (Product product : order.keySet()){
+            System.out.println(product.name + " " + String.format("%.2f", product.price));
+        }
+    }
+
+    public double getProductsum() {
+        return productSum;
+    }
+
+    public String rublesFormat(double rubles) {
+        int lastDigit = (int) (Math.floor(rubles) % 10);
+        if (((int) (Math.floor(rubles) % 100)) <= 19 && ((int)(Math.floor(rubles) % 100)) >= 11)
+            return "рублей";
+        switch (lastDigit)  {
+            case 1:
+                return "рубль";
+            case 2:
+            case 3:
+            case 4:
+                return "рубля";
+            default:
+                return "рублей";
+        }
+    }
+
+
+}

src/main/java/Main.java

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+import java.util.Scanner;
 
 public class Main {
     public static void main(String[] args) {
-        System.out.println("Hello world!");
+        int peopleCount = getpeopleCount();
+        calculateProduct(peopleCount);
     }
-}
+
+    private static int getpeopleCount() {
+        int peopleCount;
+        while (true){
+            System.out.println("Введите кол-во людей");
+            Scanner scanner = new Scanner(System.in);
+            String peopleCountString = scanner.next();
+            peopleCount = parseStringIntoInt(peopleCountString);
+            if (peopleCount == 1){
+                System.out.println("Нет смысла высчитывать на 1-го человека");
+            }else if (peopleCount < 1) {
+                System.out.println("Введено неверное число");
+            }else {
+                break;
+            }
+        }
+        return peopleCount;
+    }
+
+    private static void calculateProduct(int peopleCount) {
+        Calculator calculator = new Calculator();
+        while (true){
+            Scanner scanner = new Scanner(System.in);
+            System.out.println("Введите название продукта или \"Завершить\" что бы закончить." );
+            String productName = scanner.next();
+            if (productName.equalsIgnoreCase("Завершить")){
+                break;
+            }
+            System.out.println("Введите цену в формате \"рубли.копейки\"");
+            double productPrice;
+            String productPriceString = scanner.next();
+            productPrice = parseStringIntoDouble(productPriceString);
+            if (productPrice < 0){
+                System.out.println("Введено неверное значение");
+            }else {
+                Product product = new Product(productName, productPrice);
+                calculator.addProduct(product,1);
+                System.out.println("Продукт добавлен");
+            }
+        }
+        calculator.showProduct();
+        double perconСheck = calculator.getProductsum()/peopleCount;
+        System.out.println("Каждый должен заплатить по: " + String.format("%.2f",perconСheck) + " " + calculator.rublesFormat(perconСheck));
+    }
+
+    private static int parseStringIntoInt(String string){
+        try {
+            return Integer.parseInt(string);
+        }catch (NumberFormatException e){
+            return -1;
+        }
+    }
+    private static double parseStringIntoDouble(String string) {
+        try {
+            return Double.parseDouble(string);
+        }catch (NumberFormatException e){
+            return -1;
+        }
+    }
+
+
+
+}
+

src/main/java/Product.java

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