Lesson 3

lessons/src/main/java/lessons/lesson03/App.java

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+package Lesson3;
+
+public class App {
+    public static void main(String[] args) {
+        /*Person person = new Person("Shohjahon", 30);
+        person.intro();*/
+
+        /*Rectangle rectangle = new Rectangle(4, 5);
+        System.out.println("Area: " + rectangle.calcSquare());
+        System.out.println("Perimeter: " + rectangle.calcPerimeter());*/
+
+        /*Car car = new Car("Japan", "Toyota", 2025);
+        car.print();*/
+
+        /*BankAcc bankAcc = new BankAcc("Shohjahon", "123456789", 100);
+        bankAcc.deposit(150);
+        bankAcc.withdraw(50);
+        bankAcc.print();*/
+
+        /*Book book = new Book("123456789", "Awareness", "Osho", 2000, true);
+        book.addNewBook(book);
+        book.getBookInfo();
+        book.reserveBook();
+        book.getBooks();*/
+
+        /*OnlineStore product = new OnlineStore("001", "Phone", 600, 10);
+        product.addProduct(product);
+        product.getProducts();
+        product.buyProduct(1);
+        product.getProducts();*/
+
+        /*BankSystem acc1 = new BankSystem("001", "Shohjahon", 100);
+        BankSystem acc2 = new BankSystem("002", "Ali", 150);
+        BankSystem.addAcc(acc1);
+        BankSystem.addAcc(acc2);
+        BankSystem.showAllAcc();
+        acc1.replenishAcc(100);
+        BankSystem.transferBetweenAcc("002", "001", 50);
+        BankSystem.showAllAcc();
+        BankSystem.deleteAcc("002");
+        BankSystem.showAllAcc();*/
+
+        /*Fighter ali = new Fighter("F1", "Ali", 100, 20);
+        Fighter bob = new Fighter("F2", "Bob", 100, 20);
+        Fighter.addFighter(ali);
+        Fighter.addFighter(bob);
+        Fighter.getFighters();
+        Fighter.fight(ali, bob);*/
+    }
+}

lessons/src/main/java/lessons/lesson03/BankAcc.java

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+package Lesson3;
+
+public class BankAcc {
+    private String FIO;
+    private String accNumber;
+    private int balance;
+
+    public BankAcc(String FIO, String accNumber, int balance) {
+        this.FIO = FIO;
+        this.accNumber = accNumber;
+        this.balance = balance;
+    }
+
+    public void deposit(double amount) {
+        if (amount > 0) {
+            balance += (int) amount;
+            System.out.printf("Deposit: %s. New balance: %s.", amount, balance);
+        } else {
+            System.out.println("Deposit amount must be positive.");
+        }
+    }
+
+    public void withdraw(double amount) {
+        if (amount > 0 && amount <= balance) {
+            balance -= (int) amount;
+            System.out.printf("Withdrew: %s. New balance: %s.", amount, balance);
+        } else {
+            System.out.println("Invalid withdrawal amount or insufficient funds.");
+        }
+    }
+
+    public int getBalance() {
+        return balance;
+    }
+
+    public void print() {
+        System.out.printf("%s, %s, %s.", FIO, accNumber, balance);
+    }
+}

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

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+package Lesson3;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class BankSystem {
+    private String accNumber;
+    private String fullName;
+    private double balance;
+
+    private static List<BankSystem> accounts = new ArrayList<>();
+
+    public BankSystem(String accNumber, String fullName, double balance) {
+        this.accNumber = accNumber;
+        this.fullName = fullName;
+        this.balance = balance;
+    }
+
+    public void getInfo() {
+        System.out.printf("%s, %s, %s.%n", accNumber, fullName, balance);
+    }
+
+    public static void addAcc(BankSystem bankAcc) {
+        accounts.add(bankAcc);
+        System.out.printf("%s added.%n", bankAcc.fullName);
+    }
+
+    public static void deleteAcc(String accNumber) {
+        BankSystem accToRemove = findAcc(accNumber);
+        if (accToRemove != null) {
+            accounts.remove(accToRemove);
+            System.out.printf("%s deleted.%n", accNumber);
+        } else {
+            System.out.println("Account not found.%n");
+        }
+    }
+
+    private static BankSystem findAcc(String accNumber) {
+        for (BankSystem acc : accounts) {
+            if (acc.accNumber.equals(accNumber)) {
+                return acc;
+            }
+        }
+        return null;
+    }
+
+    public void replenishAcc(double amount) {
+        if (amount > 0) {
+            balance += amount;
+            System.out.printf("Replenish: %s. New balance: %s.%n", amount, balance);
+        } else {
+            System.out.println("Amount must be positive.%n");
+        }
+    }
+
+    public static void showAllAcc() {
+        if (accounts.isEmpty()) {
+            System.out.println("No account.%n");
+        } else {
+            for (BankSystem acc : accounts) {
+                acc.getInfo();
+            }
+        }
+    }
+
+    public static void transferBetweenAcc(String fromAcc, String toAcc, double amount) {
+        BankSystem sender = findAcc(fromAcc);
+        BankSystem receiver = findAcc(toAcc);
+
+        if (sender == null || receiver == null) {
+            System.out.println("Not found.%n");
+        }
+
+        if (amount >= 0 && Objects.requireNonNull(sender).balance >= amount) {
+            sender.balance -= amount;
+            assert receiver != null;
+            receiver.balance += amount;
+            System.out.printf("Transfer from %s to %s.%n", sender.fullName, receiver.fullName);
+        } else {
+            System.out.println("Fail.");
+        }
+    }
+}

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

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+package Lesson3;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Book {
+    private String isbn;
+    private String name;
+    private String author;
+    private int year;
+    private boolean status;
+
+    private static List<Book> books = new ArrayList<>();
+
+    public Book(String isbn, String name, String author, int year, boolean status) {
+        this.isbn = isbn;
+        this.name = name;
+        this.author = author;
+        this.year = year;
+        this.status = status;
+    }
+
+    public void getBookInfo() {
+        System.out.printf("%s, %s, %s, %s.", isbn, name, author, year);
+        System.out.println(status ? "Available" : "Not Available");
+    }
+
+    public void getBooks() {
+        if (books.isEmpty()) {
+            System.out.println("No books.");
+        } else {
+            for (Book book : books) {
+                book.getBookInfo();
+            }
+        }
+    }
+
+    public void addNewBook(Book newBook) {
+        books.add(newBook);
+        System.out.printf("Added: %s.", newBook.name);
+    }
+
+    public void reserveBook() {
+        if (status) {
+            status = false;
+            System.out.printf("%s reserved.", name);
+        } else {
+            System.out.printf("%s is already reserved.", name);
+        }
+    }
+}

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

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+package Lesson3;
+
+public class Car {
+    private String country;
+    private String model;
+    private int yearOfManufacture;
+
+    public Car(String country, String model, int yearOfManufacture) {
+        this.country = country;
+        this.model = model;
+        this.yearOfManufacture = yearOfManufacture;
+    }
+
+    public void print() {
+        System.out.printf("%s, %s, %s.", country, model, yearOfManufacture);
+    }
+}

lessons/src/main/java/lessons/lesson03/Fighter.java

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+package Lesson3;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+public class Fighter {
+    private String code;
+    private String name;
+    private int health;
+    private int attack;
+
+    private static List<Fighter> fighters = new ArrayList<>();
+
+    public Fighter(String code, String name, int health, int attack) {
+        this.code = code;
+        this.name = name;
+        this.health = health;
+        this.attack = attack;
+    }
+
+    public void getInfo() {
+        System.out.printf("%s, %s, %s, %s.%n", code, name, health, attack);
+    }
+
+    public static void getFighters() {
+        if (fighters.isEmpty()) {
+            System.out.println("No fighters.%n");
+        } else {
+            for (Fighter fighter : fighters) {
+                fighter.getInfo();
+            }
+        }
+    }
+
+    public static void addFighter(Fighter fighter) {
+        fighters.add(fighter);
+        System.out.printf("%s added.%n", fighter.name);
+    }
+
+    public static void fight(Fighter fighter1, Fighter fighter2) {
+        Random random = new Random();
+
+        System.out.printf("Fight: %s vs %s.%n", fighter1, fighter2);
+
+        Fighter attacker = random.nextBoolean() ? fighter1 : fighter2;
+        Fighter defender = (attacker == fighter1) ? fighter2 : fighter1;
+
+        while (fighter1.health > 0 && fighter2.health > 0) {
+            int damage = attacker.attack;
+            defender.health -= damage;
+
+            System.out.printf("%s attacks %s for %s damage! %s health %s.%n",
+                    attacker.name, defender.name, damage, defender.name, defender.health);
+
+            Fighter temp = attacker;
+            attacker = defender;
+            defender = temp;
+        }
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
+}

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

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+package Lesson3;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class OnlineStore {
+    private String code;
+    private String name;
+    private double price;
+    private int count;
+
+    private static List<OnlineStore> storeList = new ArrayList<>();
+
+    public OnlineStore(String code, String name, double price, int count) {
+        this.code = code;
+        this.name = name;
+        this.price = price;
+        this.count = count;
+    }
+
+    public void addProduct(OnlineStore product) {
+        storeList.add(product);
+        System.out.printf("%s added.%n", product.name);
+    }
+
+    public void buyProduct(int quantity) {
+        if (quantity > 0 && quantity <= count) {
+            count -= quantity;
+            System.out.printf("Bought %d of %s. Remaining: %s.%n", quantity, name, count);
+        } else {
+            System.out.println("Not enough.");
+        }
+    }
+
+    public void getInfo() {
+        System.out.printf("%s, %s, %s, %s.%n", code, name, price, count);
+    }
+
+    public void getProducts() {
+        if (storeList.isEmpty()) {
+            System.out.println("No products.");
+        } else {
+            for (OnlineStore product : storeList) {
+                product.getInfo();
+            }
+        }
+    }
+}
+

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

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+package Lesson3;
+
+public class Person {
+    private String name;
+    private int age;
+
+    public Person(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public void intro() {
+        System.out.printf("I am %s, %s yo.", name, age);
+    }
+}