Lesson 03

src/main/java/lessons/lesson03/bankSystem/Account.java

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+package lessons.lesson03.bankSystem;
+
+public class Account {
+    private int accountNumber;
+    private String fio;
+    private double balance;
+
+    public String getFio() {
+        return fio;
+    }
+
+    public Account(int accountNumber, String fio, double balance) {
+        this.accountNumber = accountNumber;
+        this.fio = fio;
+        this.balance = balance;
+    }
+
+    public String getAccountInfo() {
+        return "AccountNumber: " + accountNumber + "\nFIO: " + fio + "\nBalance: " + balance + "\n";
+    }
+
+    public int getAccountNumber() {
+        return accountNumber;
+    }
+
+    public void setAccountNumber(int accountNumber) {
+        this.accountNumber = accountNumber;
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    public void setBalance(double balance) {
+        this.balance = balance;
+    }
+}
+

src/main/java/lessons/lesson03/bankSystem/BankSystem.java

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+package lessons.lesson03.bankSystem;
+
+import java.util.ArrayList;
+
+public class BankSystem {
+    private ArrayList<Account> accounts = new ArrayList<>();
+
+    public void addAccount(Account account) {
+        accounts.add(account);
+    }
+
+    public void deleteAccount(int accountNumber) {
+        accounts.removeIf(account -> accountNumber == account.getAccountNumber());
+    }
+
+    public void replenishAccount(int accountNumber, double amount) {
+        if (amount < 0) {
+            System.out.println("You cannot send negative sum!");
+            return;
+        }
+        for (Account account : accounts) {
+            if (accountNumber == account.getAccountNumber()) {
+                account.setBalance(account.getBalance() + amount);
+                System.out.println(account.getFio() + " balance has been replenished: " + amount);
+                System.out.println("Current balance: " + account.getBalance() + "\n");
+            }
+        }
+    }
+
+    public void transferMoneyBetweenAccounts(int from, int to, double amount) {
+        Account sender = null;
+        Account receiver = null;
+        for (Account account : accounts) {
+            if (account.getAccountNumber() == from) sender = account;
+            if (account.getAccountNumber() == to) receiver = account;
+        }
+        if (sender == null || receiver == null) {
+            System.out.println("One of the accounts was not found!");
+            return;
+        }
+        if (sender.getBalance() < amount) {
+            System.out.println("Not enough money for transfer!");
+            return;
+        }
+        sender.setBalance(sender.getBalance() - amount);
+        receiver.setBalance(receiver.getBalance() + amount);
+        System.out.println("Transfer successful! " + amount + " from " + from + " to " + to + "\n");
+    }
+
+    public void getAccounts() {
+        if (accounts.isEmpty()) {
+            System.out.println("No accounts found!");
+            return;
+        }
+        for (Account account : accounts) {
+            System.out.println(account.getAccountInfo());
+        }
+    }
+}

src/main/java/lessons/lesson03/bankSystem/MainBankSystem.java

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+package lessons.lesson03.bankSystem;
+
+public class MainBankSystem {
+    public static void main(String[] args) {
+        Account accountNew = new Account(1234, "Aleksey Kivovarov", 9022212.5);
+        Account accountNew1 = new Account(1235, "Aleksey Kavalniy", 123);
+        BankSystem bankSystem = new BankSystem();
+        bankSystem.addAccount(accountNew);
+        bankSystem.getAccounts();
+        System.out.println();
+
+        bankSystem.transferMoneyBetweenAccounts(1234, 1235, 877);
+        System.out.println();
+
+        bankSystem.replenishAccount(1234, -456);
+        System.out.println();
+
+        bankSystem.replenishAccount(1234, 0.5);
+        System.out.println();
+
+        bankSystem.addAccount(accountNew1);
+        bankSystem.transferMoneyBetweenAccounts(1234, 1235, 9022212);
+        bankSystem.getAccounts();
+        System.out.println();
+
+        bankSystem.deleteAccount(1235);
+        bankSystem.deleteAccount(1234);
+        bankSystem.getAccounts();
+    }
+}

src/main/java/lessons/lesson03/basicClasses/Book.java

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+package lessons.lesson03.basicClasses;
+
+public class Book {
+    private final int isbn;
+    private String title;
+    private String author;
+    private int year;
+    private boolean status;
+
+    public Book(int isbn, String title, String author, int year, boolean status) {
+        this.isbn = isbn;
+        this.title = title;
+        this.author = author;
+        this.year = year;
+        this.status = status;
+    }
+
+    public void getBookInfo() {
+        System.out.println("Information about " + title +
+                "\nISBN: " + isbn +
+                "\nTitle: " + title +
+                "\nAuthor: " + author +
+                "\nYear: " + year +
+                "\nStatus: " + status);
+    }
+
+    public void reserveBook() {
+        status = false;
+    }
+}

src/main/java/lessons/lesson03/basicClasses/Car.java

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+package lessons.lesson03.basicClasses;
+
+public class Car {
+    private final String country;
+    private final String model;
+    private final int yearOfManufacture;
+
+    public Car(String country, String model, int yearOfManufacture) {
+        this.country = country;
+        this.model = model;
+        this.yearOfManufacture = yearOfManufacture;
+    }
+
+    public void printInfo() {
+        System.out.println("Information about car:" +
+                "\nThe country of a car is " + country +
+                "\nThe model is " + model +
+                "\nThe year of made is " + yearOfManufacture);
+    }
+}

src/main/java/lessons/lesson03/basicClasses/Library.java

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+package lessons.lesson03.basicClasses;
+
+import java.util.ArrayList;
+
+public class Library {
+    private ArrayList<Book> books = new ArrayList<>();
+
+    public void addNewBook(Book book) {
+        books.add(book);
+    }
+
+    public void getBooks() {
+        for (Book book : books) {
+            book.getBookInfo();
+        }
+    }
+}

src/main/java/lessons/lesson03/basicClasses/Person.java

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+package lessons.lesson03.basicClasses;
+
+public class Person {
+    private String name;
+    private int age;
+
+    public Person(String name, int age) {
+        this.age = age;
+        this.name = name;
+    }
+    public void setAge(int age) {
+        this.age = age;
+    }
+    public int getAge() {
+        return age;
+    }
+    public void introduce() {
+        System.out.println("Hello! My name is " + name + " and I am " + age + " years old.");
+    }
+}

src/main/java/lessons/lesson03/basicClasses/Rectangle.java

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+package lessons.lesson03.basicClasses;
+
+public class Rectangle {
+    private final int length;
+    private final int width;
+
+    public Rectangle(int length, int width) {
+        this.length = length;
+        this.width = width;
+    }
+
+    public void calculateSquare() {
+        int square = width * length;
+        System.out.println("Square of rectangle is: " + square);
+    }
+
+    public void calculatePerimeter() {
+        double perimeter = (width + length) / 2.0;
+        System.out.println("Perimeter of rectangle is: " + perimeter);
+    }
+
+
+}

src/main/java/lessons/lesson03/onlineStore/Main.java

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+package lessons.lesson03.onlineStore;
+
+public class Main {
+    public static void main(String[] args) {
+        Product product = new Product(1234,"SAMSUNG A12", 100, 10);
+        Product product1 = new Product(1234,"SAMSUNG A12", 100, 10);
+        Product product2 = new Product(1233,"SAMSUNG A11", 80, 30);
+        Product product3 = new Product(1234,"SAMSUNG A12", 100, 5);
+
+
+        OnlineStore onlineStore = new OnlineStore();
+        onlineStore.addProduct(product);
+
+        onlineStore.addProduct(product1);
+
+//        onlineStore.addProduct(product2);
+
+        onlineStore.buyProduct(1234, 29);
+//        onlineStore.getProducts(1233);
+//        onlineStore.buyProduct(123, 31);
+//        onlineStore.getProducts(1);
+//        onlineStore.getProducts();
+//        onlineStore.getProducts(1233);
+//        onlineStore.buyProduct(1233, 31);
+//        onlineStore.buyProduct(1233, 2);
+//        onlineStore.getProducts();
+        onlineStore.addProduct(product3);
+        onlineStore.getProducts();
+        product3.setPrice(95.0);
+        onlineStore.getProducts(1234);
+        onlineStore.addProduct(product3);
+        onlineStore.getProducts();
+
+    }
+}

src/main/java/lessons/lesson03/onlineStore/OnlineStore.java

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+package lessons.lesson03.onlineStore;
+
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class OnlineStore {
+
+    private ArrayList<Product> products = new ArrayList<>();
+
+    public void addProduct(Product product) {
+        boolean found = false;
+        for (Product product1 : products) {
+            if (product1.getCode() == product.getCode()) {
+                product1.setCount(product1.getCount() + product.getCount());
+                product1.setPrice(product.getPrice());
+                found = true;
+                break;
+            }
+        }
+        if (!found) {
+            products.add(product);
+        }
+    }
+
+    public void buyProduct(int code, int count) {
+        for (Product product : products) {
+            if (code != product.getCode()) {
+                continue;
+            }
+            if (product.getCount() == 0) {
+                System.out.println("Product is not available!");
+                return;
+            }
+            if (product.getCount() < count) {
+                System.out.print("Just " + product.getCount() + " products are available!" +
+                        "\nDo you want buy all of them - " + product.getCount() + "? Yes or No - ");
+                Scanner sc = new Scanner(System.in);
+                String yesOrNo = sc.next();
+                if (yesOrNo.equals("Yes")) {
+                    product.setCount(0);
+                    System.out.println("You bought all of them!\n");
+                } else {
+                    System.out.println("Purchase cancelled.\n");
+                }
+                return;
+            }
+            product.setCount(product.getCount() - count);
+            System.out.println("You bought " + count + " products");
+            return;
+        }
+        System.out.println("The code of product is incorrect. Try again!\n");
+    }
+
+    public void getProducts(int code) {
+        boolean found = false;
+        for (Product product : products) {
+            if (product.getCode() == code) {
+                System.out.println(product.getProductInfo());
+                found = true;
+            }
+        }
+        if (!found) {
+            System.out.println("There is no such Product! Try again.\n");
+        }
+    }
+
+    public void getProducts() {
+        System.out.println("Information about all of Products in List");
+        for (Product product : products) {
+            System.out.println(product.getProductInfo());
+        }
+        System.out.println("Thats it!\n");
+    }
+
+}

src/main/java/lessons/lesson03/onlineStore/Product.java

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+package lessons.lesson03.onlineStore;
+
+public class Product {
+    private final int code;
+    private String name;
+    private double price;
+    private int count;
+
+    public Product(int code, String name, double price, int count) {
+        this.code = code;
+        this.name = name;
+        this.price = price;
+        this.count = count;
+    }
+    public String getProductInfo() {
+        return "Code: " + code + "\nName: " + name + "\nPrice: " + price + "\nCount: " + count + "\n";
+    }
+
+    public int getCode() {
+        return code;
+    }
+
+    public int getCount() {
+        return count;
+    }
+
+    public void setCount(int count) {
+        this.count = count;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
+}