diff --git a/src/main/java/lesson_3/Item.java b/src/main/java/lesson_3/Item.java
new file mode 100644
index 0000000..9dae6c3
--- /dev/null
+++ b/src/main/java/lesson_3/Item.java
@@ -0,0 +1,15 @@
+package lesson_3;
+
+public abstract class Item {
+    protected String name;
+
+    public Item(String name) {
+        this.name = name;
+    }
+
+    public abstract void displayInfo();
+
+    public String getName() {
+        return name;
+    }
+}
diff --git a/src/main/java/lesson_3/park/Park.java b/src/main/java/lesson_3/park/Park.java
new file mode 100644
index 0000000..942d90d
--- /dev/null
+++ b/src/main/java/lesson_3/park/Park.java
@@ -0,0 +1,50 @@
+package lesson_3.park;
+
+import lesson_3.Item;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Park {
+    private String parkName;
+    private List<Attraction> attractions;
+
+    public Park(String parkName) {
+        this.parkName = parkName;
+        this.attractions = new ArrayList<>();
+    }
+
+    public void addAttraction(String name, String workingHours, double cost) {
+        attractions.add(new Attraction(name, workingHours, cost));
+    }
+
+    public void showAttractions() {
+        System.out.println("Парк: " + parkName);
+        for (Attraction attraction : attractions) {
+            attraction.displayInfo();
+        }
+    }
+
+    public String getParkName() {
+        return parkName;
+    }
+
+    public class Attraction extends Item {
+        private String workingHours;
+        private double cost;
+
+        public Attraction(String name, String workingHours, double cost) {
+            super(name);
+            this.workingHours = workingHours;
+            this.cost = cost;
+        }
+
+        @Override
+        public void displayInfo() {
+            System.out.println("Аттракцион: " + name);
+            System.out.println("Время работы: " + workingHours);
+            System.out.println("Стоимость: " + cost);
+            System.out.println("---------------------------");
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_3/park/ParkMain.java b/src/main/java/lesson_3/park/ParkMain.java
new file mode 100644
index 0000000..438a892
--- /dev/null
+++ b/src/main/java/lesson_3/park/ParkMain.java
@@ -0,0 +1,22 @@
+package lesson_3.park;
+
+public class ParkMain {
+    public static void main(String[] args) {
+        Park amusementPark = new Park("Весёлый городок");
+
+        amusementPark.addAttraction("Колесо обозрения", "10:00 - 22:00", 300);
+        amusementPark.addAttraction("Американские горки", "11:00 - 21:00", 500);
+        amusementPark.addAttraction("Комната страха", "14:00 - 23:00", 400);
+
+        Park pokatushkiPark = new Park("Покатушки");
+
+        pokatushkiPark.addAttraction("Машинки", "10:00 - 22:00", 200);
+        pokatushkiPark.addAttraction("Американские горки", "11:00 - 21:00", 500);
+        pokatushkiPark.addAttraction("Комната страха", "14:00 - 23:00", 400);
+        pokatushkiPark.addAttraction("Карусель", "10:00 - 22:00", 250);
+
+        amusementPark.showAttractions();
+        System.out.println();
+        pokatushkiPark.showAttractions();
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_3/product/Product.java b/src/main/java/lesson_3/product/Product.java
new file mode 100644
index 0000000..8801cf0
--- /dev/null
+++ b/src/main/java/lesson_3/product/Product.java
@@ -0,0 +1,32 @@
+package lesson_3.product;
+
+import lesson_3.Item;
+
+public class Product extends Item {
+    private String productionDate;
+    private String manufacturer;
+    private String countryOfOrigin;
+    private double price;
+    private boolean isReserved;
+
+    public Product(String name, String productionDate, String manufacturer,
+                   String countryOfOrigin, double price, boolean isReserved) {
+        super(name);
+        this.productionDate = productionDate;
+        this.manufacturer = manufacturer;
+        this.countryOfOrigin = countryOfOrigin;
+        this.price = price;
+        this.isReserved = isReserved;
+    }
+
+    @Override
+    public void displayInfo() {
+        System.out.println("Название: " + name);
+        System.out.println("Дата производства: " + productionDate);
+        System.out.println("Производитель: " + manufacturer);
+        System.out.println("Страна происхождения: " + countryOfOrigin);
+        System.out.println("Цена: " + price);
+        System.out.println("Забронировано: " + (isReserved ? "Да" : "Нет"));
+        System.out.println("---------------------------");
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_3/product/ProductMain.java b/src/main/java/lesson_3/product/ProductMain.java
new file mode 100644
index 0000000..d31da67
--- /dev/null
+++ b/src/main/java/lesson_3/product/ProductMain.java
@@ -0,0 +1,22 @@
+package lesson_3.product;
+
+public class ProductMain {
+    public static void main(String[] args) {
+        Product[] productsArray = new Product[5];
+
+        productsArray[0] = new Product("Samsung S25 Ultra", "01.02.2025",
+                "Samsung Corp.", "Korea", 5599, true);
+        productsArray[1] = new Product("Apple iPhone 15", "15.09.2024",
+                "Apple Inc.", "USA", 9999, false);
+        productsArray[2] = new Product("Xiaomi Mi 13", "10.03.2024",
+                "Xiaomi", "China", 4999, false);
+        productsArray[3] = new Product("Sony WH-1000XM5", "20.07.2023",
+                "Sony", "Japan", 2999, true);
+        productsArray[4] = new Product("Dell XPS 13", "05.11.2023",
+                "Dell", "USA", 11999, false);
+
+        for (Product p : productsArray) {
+            p.displayInfo();
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/animals/Animal.java b/src/main/java/lesson_4/animals/Animal.java
new file mode 100644
index 0000000..5071451
--- /dev/null
+++ b/src/main/java/lesson_4/animals/Animal.java
@@ -0,0 +1,37 @@
+package lesson_4.animals;
+
+import lombok.Getter;
+
+public abstract class Animal {
+    protected String name;
+    protected int runLimit;
+    protected int swimLimit;
+
+    @Getter
+    private static int animalsCount = 0;
+
+    public Animal(String name, int runLimit, int swimLimit) {
+        this.name = name;
+        this.runLimit = runLimit;
+        this.swimLimit = swimLimit;
+        animalsCount++;
+    }
+
+    public void run(int distance) {
+        if (distance <= runLimit) {
+            System.out.println(name + " пробежал " + distance + " м.");
+        } else {
+            System.out.println(name + " не смог пробежать " + distance + " м.");
+        }
+    }
+
+    public void swim(int distance) {
+        if (swimLimit == 0) {
+            System.out.println(name + " не умеет плавать.");
+        } else if (distance <= swimLimit) {
+            System.out.println(name + " проплыл " + distance + " м.");
+        } else {
+            System.out.println(name + " не смог проплыть " + distance + " м.");
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/animals/AnimalsMain.java b/src/main/java/lesson_4/animals/AnimalsMain.java
new file mode 100644
index 0000000..938378e
--- /dev/null
+++ b/src/main/java/lesson_4/animals/AnimalsMain.java
@@ -0,0 +1,42 @@
+package lesson_4.animals;
+
+public class AnimalsMain {
+    public static void main(String[] args) {
+        Cat[] cats = {
+                new Cat("Барсик"),
+                new Cat("Мурка"),
+                new Cat("Рыжик")
+        };
+
+        Dog dog = new Dog("Бобик");
+
+        Bowl bowl = new Bowl(20);
+
+        for (Cat cat : cats) {
+            cat.eat(bowl, 15);
+        }
+
+        System.out.println();
+
+        bowl.addFood(30);
+        for (Cat cat : cats) {
+            if (!cat.isFull()) {
+                cat.eat(bowl, 15);
+            }
+        }
+
+        System.out.println();
+
+        cats[0].run(100);
+        cats[0].swim(5);
+
+        dog.run(400);
+        dog.swim(8);
+
+        System.out.println();
+
+        System.out.println("Создано котов: " + Cat.getCatsCount());
+        System.out.println("Создано собак: " + Dog.getDogsCount());
+        System.out.println("Всего животных: " + Animal.getAnimalsCount());
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/animals/Bowl.java b/src/main/java/lesson_4/animals/Bowl.java
new file mode 100644
index 0000000..cf2fae6
--- /dev/null
+++ b/src/main/java/lesson_4/animals/Bowl.java
@@ -0,0 +1,23 @@
+package lesson_4.animals;
+
+import lombok.Getter;
+
+@Getter
+public class Bowl {
+    private int foodAmount;
+
+    public Bowl(int foodAmount) {
+        this.foodAmount = Math.max(foodAmount, 0);
+    }
+
+    public void decreaseFood(int amount) {
+        foodAmount = Math.max(foodAmount - amount, 0);
+    }
+
+    public void addFood(int amount) {
+        if (amount > 0) {
+            foodAmount += amount;
+            System.out.println("Добавлено " + amount + " еды. Сейчас в миске: " + foodAmount);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/animals/Cat.java b/src/main/java/lesson_4/animals/Cat.java
new file mode 100644
index 0000000..ca478d0
--- /dev/null
+++ b/src/main/java/lesson_4/animals/Cat.java
@@ -0,0 +1,26 @@
+package lesson_4.animals;
+
+import lombok.Getter;
+
+@Getter
+public class Cat extends Animal {
+    @Getter
+    private static int catsCount = 0;
+    private boolean isFull;
+
+    public Cat(String name) {
+        super(name, 200, 0);
+        this.isFull = false;
+        catsCount++;
+    }
+
+    public void eat(Bowl bowl, int amount) {
+        if (bowl.getFoodAmount() >= amount) {
+            bowl.decreaseFood(amount);
+            isFull = true;
+            System.out.println(name + " покушал и теперь сыт.");
+        } else {
+            System.out.println(name + " остался голодным. Недостаточно еды ");
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/animals/Dog.java b/src/main/java/lesson_4/animals/Dog.java
new file mode 100644
index 0000000..96e8dac
--- /dev/null
+++ b/src/main/java/lesson_4/animals/Dog.java
@@ -0,0 +1,13 @@
+package lesson_4.animals;
+
+import lombok.Getter;
+
+public class Dog extends Animal {
+    @Getter
+    private static int dogsCount = 0;
+
+    public Dog(String name) {
+        super(name, 500, 10);
+        dogsCount++;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/shapes/Circle.java b/src/main/java/lesson_4/shapes/Circle.java
new file mode 100644
index 0000000..1c2b78b
--- /dev/null
+++ b/src/main/java/lesson_4/shapes/Circle.java
@@ -0,0 +1,20 @@
+package lesson_4.shapes;
+
+public class Circle extends GeometricFigure {
+    private double radius;
+
+    public Circle(double radius, String fillColor, String borderColor) {
+        super(fillColor, borderColor);
+        this.radius = radius;
+    }
+
+    @Override
+    public double getPerimeter() {
+        return 2 * Math.PI * radius;
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI * radius * radius;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/shapes/GeometricFigure.java b/src/main/java/lesson_4/shapes/GeometricFigure.java
new file mode 100644
index 0000000..b362540
--- /dev/null
+++ b/src/main/java/lesson_4/shapes/GeometricFigure.java
@@ -0,0 +1,26 @@
+package lesson_4.shapes;
+
+public abstract class GeometricFigure implements Measurable {
+    protected String fillColor;
+    protected String borderColor;
+
+    public GeometricFigure(String fillColor, String borderColor) {
+        this.fillColor = fillColor;
+        this.borderColor = borderColor;
+    }
+
+    public String getFillColor() {
+        return fillColor;
+    }
+
+    public String getBorderColor() {
+        return borderColor;
+    }
+
+    public void printFullInfo() {
+        printInfo();
+        System.out.println("Цвет заливки: " + fillColor);
+        System.out.println("Цвет границы: " + borderColor);
+        System.out.println("---------------------------");
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/shapes/Measurable.java b/src/main/java/lesson_4/shapes/Measurable.java
new file mode 100644
index 0000000..a319e90
--- /dev/null
+++ b/src/main/java/lesson_4/shapes/Measurable.java
@@ -0,0 +1,11 @@
+package lesson_4.shapes;
+
+public interface Measurable {
+    double getPerimeter();
+    double getArea();
+
+    default void printInfo() {
+        System.out.println("Периметр: " + getPerimeter());
+        System.out.println("Площадь: " + getArea());
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/shapes/Rectangle.java b/src/main/java/lesson_4/shapes/Rectangle.java
new file mode 100644
index 0000000..b062652
--- /dev/null
+++ b/src/main/java/lesson_4/shapes/Rectangle.java
@@ -0,0 +1,22 @@
+package lesson_4.shapes;
+
+public class Rectangle extends GeometricFigure {
+    private double width;
+    private double height;
+
+    public Rectangle(double width, double height, String fillColor, String borderColor) {
+        super(fillColor, borderColor);
+        this.width = width;
+        this.height = height;
+    }
+
+    @Override
+    public double getPerimeter() {
+        return 2 * (width + height);
+    }
+
+    @Override
+    public double getArea() {
+        return width * height;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/shapes/ShapesMain.java b/src/main/java/lesson_4/shapes/ShapesMain.java
new file mode 100644
index 0000000..203fa87
--- /dev/null
+++ b/src/main/java/lesson_4/shapes/ShapesMain.java
@@ -0,0 +1,16 @@
+package lesson_4.shapes;
+
+public class ShapesMain {
+    public static void main(String[] args) {
+        GeometricFigure[] figures = {
+                new Circle(5, "Красный", "Чёрный"),
+                new Rectangle(4, 6, "Синий", "Зелёный"),
+                new Triangle(3, 4, 5, "Жёлтый", "Фиолетовый")
+        };
+
+        for (GeometricFigure figure : figures) {
+            System.out.println(figure.getClass().getSimpleName() + ":");
+            figure.printFullInfo();
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/lesson_4/shapes/Triangle.java b/src/main/java/lesson_4/shapes/Triangle.java
new file mode 100644
index 0000000..ac92eba
--- /dev/null
+++ b/src/main/java/lesson_4/shapes/Triangle.java
@@ -0,0 +1,23 @@
+package lesson_4.shapes;
+
+public class Triangle extends GeometricFigure {
+    private double a, b, c;
+
+    public Triangle(double a, double b, double c, String fillColor, String borderColor) {
+        super(fillColor, borderColor);
+        this.a = a;
+        this.b = b;
+        this.c = c;
+    }
+
+    @Override
+    public double getPerimeter() {
+        return a + b + c;
+    }
+
+    @Override
+    public double getArea() {
+        double s = getPerimeter() / 2;
+        return Math.sqrt(s * (s - a) * (s - b) * (s - c));
+    }
+}
\ No newline at end of file