sem04 almost

seminars/jtc4-04c.tex

@@ -170,8 +170,78 @@ private static final class RowMismatchException extends RuntimeException {
   \end{enumerate}
   \textbf{Вариант исполнения класса в приложении \ref{appendix:ct1}}
 
-  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Создание объекта класса}]
+  \textbf{Вариант маршрута решения задачи}
+
+  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Описание класса исключения логина}]
+public static class WrongLoginException extends RuntimeException {
+    private int currentLength;
+    public WrongLoginException(int currentLength) {
+        super();
+        this.currentLength = currentLength;
+    }
+
+    @Override
+    public String getMessage() {
+        return String.format("Your login is of incorrect length, expected < 20, given %d.",
+                currentLength);
+    }
+}
   \end{lstlisting}
+  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Формирование сообщения для класса исключения пароля}]
+public static class WrongPasswordException extends RuntimeException {
+    private int currentLength;
+    private boolean matchConfirm;
+    public WrongPasswordException(int currentLength, boolean matchConfirm) {
+        super();
+        this.currentLength = currentLength;
+        this.matchConfirm = matchConfirm;
+    }
+
+    @Override
+    public String getMessage() {
+        boolean badlen = currentLength <= 20;
+        return String.format("Your password is of %scorrect length%s %d. Password %smatch the confirmation.",
+                ((badlen) ? "in" : ""),
+                ((badlen) ? ", expected > 20, given" : ","),
+                currentLength,
+                (matchConfirm) ? "" : "doesn't ");
+    }
+}
+  \end{lstlisting}
+  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Создание тестовой среды}]
+public static void main(String[] args) {
+    String[][] credentials = {
+            {"ivan", "1i2v3a4n5i6v7a8n91011", "1i2v3a4n5i6v7a8n91011"}, //correct
+            {"1i2v3a4n5i6v7a8n91011", "", ""}, //wrong login length
+            {"ivan", "1i2v3a4n5i6v7a8n91011", "1i2v3a4n5"}, //confirm mismatch
+            {"ivan", "1i2v3a4n5", "1i2v3a4n5"},//wrong password length
+            {"ivan", "1i2v3a4n5", "1i"} //wrong password length and confirm mismatch
+    };
+    for (int i = 0; i < credentials.length; i++) {
+        try {
+            System.out.println(checkCredentials(credentials[i][0], credentials[i][1], credentials[i][2]));
+        } catch (WrongLoginException e) {
+            e.printStackTrace();
+        } catch (WrongPasswordException e) {
+            System.out.println(e.getMessage());
+        }
+    }
+}
+  \end{lstlisting}
+  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Метод проверки}]
+public static boolean checkCredentials(String login, String password, String confirmPassword) {
+    boolean conf = password.equals(confirmPassword);
+    int llen = login.length();
+    int plen = password.length();
+    if (llen >= 20)
+        throw new WrongLoginException(llen);
+    else if (plen < 20 || !conf)
+        throw new WrongPasswordException(plen, conf);
+    else
+        return true;
+}
+  \end{lstlisting}
+
 \end{itemize}
 
 \subsubsection{Задание 2}
@@ -200,7 +270,87 @@ private static final class RowMismatchException extends RuntimeException {
   \end{enumerate}
   \textbf{Вариант исполнения класса в приложении \ref{appendix:ct1}}
 
-  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Создание объекта класса}]
+  \textbf{Вариант маршрута решения задачи}
+
+  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Создание базовых классов (идентично)}]
+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 + "}";
+    }
+}   
+  \end{lstlisting}
+  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Создание пользовательских исключений}]
+    public static class CustomerException extends RuntimeException {
+        public CustomerException(String message) {
+            super(message);
+        }
+    }
+  \end{lstlisting}
+  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Создание массивов}]
+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];
+  \end{lstlisting}
+  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Описание тестовой среды}]
+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;
+}
+  \end{lstlisting}
+  \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Написание и отладка основного метода}]
+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);
+}
   \end{lstlisting}
 \end{itemize}
 
@@ -221,10 +371,49 @@ private static final class RowMismatchException extends RuntimeException {
 
     \textbf{Все варианты решения приведены в тексте семинара выше}
   \item [15 мин] 1. В класс покупателя добавить перечисление с гендерами, добавить в сотрудника свойство «пол» со значением созданного перечисления. Добавить геттеры, сеттеры.
-    \begin{lstlisting}[language=Java,style=JCodeStyle,caption={}]
+    \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Свойства сотрудника}]
+enum Genders{MALE, FEMALE};
+
+// ...
+Genders gender;
+
+public Employee(String name, String midName, String surName, String phone, String position, int salary, int birth, Genders gender) {
+    // ...
+    this.gender = gender;
+}
+
+public Genders getGender() {
+    return gender;
+}
+
+public void setGender(Genders gender) {
+    this.gender = gender;
+}
     \end{lstlisting}
-  \item [20-25 мин] 2. Добавить в основную программу перечисление с праздниками (Новый Год, 8 марта, 23 февраля), написать метод, принимающий массив сотрудников, поздравляющий всех сотрудников с Новым Годом, женщин с 8 марта, а мужчин с 23 февраля.
+  \item [20-25 мин] 2. Добавить в основную программу перечисление с праздниками (нет праздника, Новый Год, 8 марта, 23 февраля), написать метод, принимающий массив сотрудников, поздравляющий всех сотрудников с Новым Годом, женщин с 8 марта, а мужчин с 23 февраля, если сегодня соответствующий день.
-    \begin{lstlisting}[language=Java,style=JCodeStyle,caption={}]
+    \begin{lstlisting}[language=Java,style=JCodeStyle,caption={Праздники}]
+enum Parties{NONE, NEW_YEAR, MARCH_8, FEB_23}
+private static final Parties today = Parties.NONE;
+
+private static void celebrate(Employee[] emp) {
+    for (int i = 0; i < emp.length; i++) {
+        switch (today) {
+            case NEW_YEAR:
+                System.out.println(emp[i].name + ", happy New Year!");
+                break;
+            case FEB_23:
+                if (emp[i].gender == Employee.Genders.MALE)
+                    System.out.println(emp[i].name + ", happy February 23rd!");
+                break;
+            case MARCH_8:
+                if (emp[i].gender == Employee.Genders.FEMALE)
+                    System.out.println(emp[i].name + ", happy march 8th!");
+                break;
+            default:
+                System.out.println(emp[i].name + ", celebrate this morning!");
+        }
+    }
+}
         \end{lstlisting}
   \end{enumerate}
 \end{itemize}

seminars/src/s04-ct1-sign.java

@@ -0,0 +1,68 @@
+package ru.gb.jcore;
+
+public class SignInWorker {
+    public static class WrongPasswordException extends RuntimeException {
+        private int currentLength;
+        private boolean matchConfirm;
+        public WrongPasswordException(int currentLength, boolean matchConfirm) {
+            super();
+            this.currentLength = currentLength;
+            this.matchConfirm = matchConfirm;
+        }
+
+        @Override
+        public String getMessage() {
+            boolean badlen = currentLength <= 20;
+            return String.format("Your password is of %scorrect length%s %d. Password %smatch the confirmation.",
+                    ((badlen) ? "in" : ""),
+                    ((badlen) ? ", expected > 20, given" : ","),
+                    currentLength,
+                    (matchConfirm) ? "" : "doesn't ");
+        }
+    }
+
+    public static class WrongLoginException extends RuntimeException {
+        private int currentLength;
+        public WrongLoginException(int currentLength) {
+            super();
+            this.currentLength = currentLength;
+        }
+
+        @Override
+        public String getMessage() {
+            return String.format("Your login is of incorrect length, expected < 20, given %d.",
+                    currentLength);
+        }
+    }
+
+    public static boolean checkCredentials(String login, String password, String confirmPassword) {
+        boolean conf = password.equals(confirmPassword);
+        int llen = login.length();
+        int plen = password.length();
+        if (llen >= 20)
+            throw new WrongLoginException(llen);
+        else if (plen < 20 || !conf)
+            throw new WrongPasswordException(plen, conf);
+        else
+            return true;
+    }
+
+    public static void main(String[] args) {
+        String[][] credentials = {
+                {"ivan", "1i2v3a4n5i6v7a8n91011", "1i2v3a4n5i6v7a8n91011"}, //correct
+                {"1i2v3a4n5i6v7a8n91011", "", ""}, //wrong login length
+                {"ivan", "1i2v3a4n5i6v7a8n91011", "1i2v3a4n5"}, //confirm mismatch
+                {"ivan", "1i2v3a4n5", "1i2v3a4n5"},//wrong password length
+                {"ivan", "1i2v3a4n5", "1i"} //wrong password length and confirm mismatch
+        };
+        for (int i = 0; i < credentials.length; i++) {
+            try {
+                System.out.println(checkCredentials(credentials[i][0], credentials[i][1], credentials[i][2]));
+            } catch (WrongLoginException e) {
+                e.printStackTrace();
+            } catch (WrongPasswordException e) {
+                System.out.println(e.getMessage());
+            }
+        }
+    }
+}

seminars/src/s04-ct2-shop.java

@@ -0,0 +1,124 @@
+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;
+        }
+    }
+}