gb-java-devel/src/s04-ct2-shop.java

package ru.gb.jcore;

public class Shop {
    /**
     *   Вызвать метод совершения покупки несколько раз таким образом,
     *   чтобы заполнить массив покупок возвращаемыми значениями.
     *   Обработать исключения следующим образом (в заданном порядке):
     * */
    private static class Customer {
        String name;
        int age;
        String phone;

        public Customer(String name, int age, String phone) {
            this.name = name;
            this.age = age;
            this.phone = phone;
        }

        @Override
        public String toString() {
            return "Customer{name='" + name + '\'' +
                    ", age=" + age + ", phone='" + phone + "'}";
        }
    }
    private static class Item {
        String name;
        int cost;

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

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

    private static class Order {
        Customer customer;
        Item item;
        int amount;

        public Order(Customer customer, Item item, int amount) {
            this.customer = customer;
            this.item = item;
            this.amount = amount;
        }

        @Override
        public String toString() {
            return "Order{customer=" + customer +
                    ", item=" + item + ", amount=" + amount + "}";
        }
    }

    public static class CustomerException extends RuntimeException {
        public CustomerException(String message) { super(message); }
    }
    public static class ProductException extends RuntimeException {
        public ProductException(String message) { super(message); }
    }
    public static class AmountException extends RuntimeException {
        public AmountException(String message) { super(message); }
    }

    private final static Customer[] people = {
            new Customer("Ivan", 20, "+1-222-333-44-55"),
            new Customer("Petr", 30, "+2-333-444-55-66"),
    };
    private final static Item[] items = {
            new Item("Ball", 100),
            new Item("Sandwich", 1000),
            new Item("Table", 10000),
            new Item("Car", 100000),
            new Item("Rocket", 10000000)
    };
    private static Order[] orders = new Order[5];

    private static boolean isInArray(Object[] arr, Object o) {
        for (int i = 0; i < arr.length; i++)
            if (arr[i].equals(o)) return true;
        return false;
    }

    public static Order buy(Customer who, Item what, int howMuch) {
        if (!isInArray(people, who))
            throw new CustomerException("Unknown customer: " + who);
        if (!isInArray(items, what))
            throw new ProductException("Unknown item: " + what);
        if (howMuch < 0 || howMuch > 100)
            throw new AmountException("Incorrect amount: " + howMuch);
        return new Order(who, what, howMuch);
    }

    public static void main(String[] args) {
        Object[][] info = {
                {people[0], items[0], 1}, //good
                {people[1], items[1], -1}, //bad amount -1
                {people[0], items[2], 150}, //bad amount >100
                {people[1], new Item("Flower", 10), 1}, //no item
                {new Customer("Fedor", 40, "+3-444-555-66-77"), items[3], 1}, //no customer
        };
        int capacity = 0;
        int i = 0;
        while (capacity != orders.length - 1 || i != info.length) {
            try {
                orders[capacity] = buy((Customer) info[i][0], (Item) info[i][1], (int) info[i][2]);
                capacity++;
            } catch (ProductException e) {
                e.printStackTrace();
            } catch (AmountException e) {
                orders[capacity++] = buy((Customer) info[i][0], (Item) info[i][1], 1);
            } catch (CustomerException e) {
                throw new RuntimeException(e);
            } finally {
                System.out.println("Orders made: " + capacity);
            }
            ++i;
        }
    }
}