From ea1d506182ec811b1be2a92e64e60f2d1fb4ea97 Mon Sep 17 00:00:00 2001
From: Lolita <ilolita796@gmail.com>
Date: Tue, 28 Apr 2026 15:47:05 +0300
Subject: [PATCH] Update Car, Engine and Wheel classes

---
 src/main/java/core/basesyntax/Car.java    | 104 ++++++++++++++++++++--
 src/main/java/core/basesyntax/Engine.java |  51 ++++++++++-
 src/main/java/core/basesyntax/Wheel.java  |  38 +++++++-
 3 files changed, 183 insertions(+), 10 deletions(-)

diff --git a/src/main/java/core/basesyntax/Car.java b/src/main/java/core/basesyntax/Car.java
index a84872f46..fc6a7582f 100644
--- a/src/main/java/core/basesyntax/Car.java
+++ b/src/main/java/core/basesyntax/Car.java
@@ -1,17 +1,109 @@
 package core.basesyntax;
 
+import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * Make this class immutable. See requirements in task description.
  */
-public class Car {
-    private int year;
-    private String color;
-    private List<Wheel> wheels;
-    private Engine engine;
+public final class Car {
+    private final int year;
+    private final String color;
+    private final List<Wheel> wheels;
+    private final Engine engine;
 
-    //implement this class
+    public Car(int year, String color, List<Wheel> wheels, Engine engine) {
+        this.year = year;
+        this.color = color;
+        if (wheels == null) {
+            throw new NullPointerException();
+        } else {
+            ArrayList<Wheel> newWheels = new ArrayList<>();
+            for (Wheel wheel : wheels) {
+                newWheels.add(new Wheel(wheel.getRadius()));
+            }
+            this.wheels = newWheels;
+        }
+        if (engine == null) {
+            this.engine = null;
+        } else {
+            this.engine = new Engine(engine.getHorsePower(), engine.getManufacturer());
+        }
+    }
+
+    public int getYear() {
+        return year;
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+    public Engine getEngine() {
+        return copyEngine();
+    }
+
+    public List<Wheel> getWheels() {
+        return copyWheels();
+    }
+
+    public Car changeColor(String newColor) {
+        return new Car(year, newColor, copyWheels(), copyEngine());
+    }
+
+    public Car changeEngine(Engine engine) {
+        return new Car(year, color, copyWheels(),
+                new Engine(engine.getHorsePower(), engine.getManufacturer()));
+    }
+
+    public Car addWheel(Wheel newWheel) {
+        if (newWheel == null) {
+            return null;
+        }
+        List<Wheel> copiedWheels = copyWheels();
+        copiedWheels.add(new Wheel(newWheel.getRadius()));
+        return new Car(year, color, copiedWheels, copyEngine());
+    }
+
+    private Engine copyEngine() {
+        if (engine == null) {
+            return null;
+        }
+        return new Engine(engine.getHorsePower(), engine.getManufacturer());
+    }
+
+    private List<Wheel> copyWheels() {
+        if (wheels == null) {
+            return null;
+        }
+        ArrayList<Wheel> newWheels = new ArrayList<>();
+        for (Wheel wheel : wheels) {
+            newWheels.add(new Wheel(wheel.getRadius()));
+        }
+        return newWheels;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+        Car car = (Car) obj;
+        return this.year == car.year
+                && Objects.equals(this.color, car.color)
+                && this.wheels.equals(car.wheels)
+                && this.engine.equals(car.engine);
+
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.year, this.color, this.wheels, this.engine);
+    }
 
     @Override
     public String toString() {
diff --git a/src/main/java/core/basesyntax/Engine.java b/src/main/java/core/basesyntax/Engine.java
index a26a75c5f..1e3065774 100644
--- a/src/main/java/core/basesyntax/Engine.java
+++ b/src/main/java/core/basesyntax/Engine.java
@@ -1,10 +1,57 @@
 package core.basesyntax;
 
-public class Engine {
+import java.util.Objects;
+
+public final class Engine implements Cloneable {
     private int horsePower;
     private String manufacturer;
 
-    //implement this class
+    public Engine(int horsePower, String manufacturer) {
+        if (manufacturer == null) {
+            throw new IllegalArgumentException("Manufacturer cannot be null");
+        }
+        this.horsePower = horsePower;
+        this.manufacturer = manufacturer;
+    }
+
+    public int getHorsePower() {
+        return horsePower;
+    }
+
+    public String getManufacturer() {
+        return manufacturer;
+    }
+
+    public void setHorsePower(int horsePower) {
+        this.horsePower = horsePower;
+    }
+
+    public void setManufacturer(String manufacturer) {
+        this.manufacturer = manufacturer;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+        Engine engine = (Engine) obj;
+        return this.horsePower == engine.horsePower
+                && Objects.equals(this.manufacturer, engine.manufacturer);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.horsePower, this.manufacturer);
+    }
+
+    @Override
+    public Engine clone() {
+        return new Engine(this.horsePower, this.manufacturer);
+    }
 
     @Override
     public String toString() {
diff --git a/src/main/java/core/basesyntax/Wheel.java b/src/main/java/core/basesyntax/Wheel.java
index a09d6cd9e..7ea9509c0 100644
--- a/src/main/java/core/basesyntax/Wheel.java
+++ b/src/main/java/core/basesyntax/Wheel.java
@@ -1,9 +1,43 @@
 package core.basesyntax;
 
-public class Wheel {
+import java.util.Objects;
+
+public final class Wheel implements Cloneable {
     private int radius;
 
-    //implement this class
+    public Wheel(int radius) {
+        this.radius = radius;
+    }
+
+    public int getRadius() {
+        return radius;
+    }
+
+    public void setRadius(int radius) {
+        this.radius = radius;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+        Wheel wheel = (Wheel) obj;
+        return this.radius == wheel.radius;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.radius);
+    }
+
+    @Override
+    public Wheel clone() {
+        return new Wheel(this.radius);
+    }
 
     @Override
     public String toString() {