task completed

src/main/java/core/basesyntax/Car.java

@@ -1,25 +1,99 @@
 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("Wheels cannot be null");
+        }
+        this.wheels = copyWheels(wheels);
+        this.engine = engine == null
+                ? null
+                : new Engine(engine.getHorsePower(), engine.getManufacturer());
+    }
+
+    public int getYear() {
+        return year;
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = 31 * this.year;
+        result = 31 * result + (this.color == null ? 0 : this.color.hashCode());
+        result = 31 * result + (this.wheels == null ? 0 : this.wheels.hashCode());
+        result = 31 * result + (this.engine == null ? 0 : this.engine.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        } else if (obj == null || obj.getClass() != this.getClass()) {
+            return false;
+        }
+        Car newCar = (Car) obj;
+        return (this.year == newCar.year)
+                && Objects.equals(this.color, newCar.color)
+                && this.wheels.equals(newCar.wheels)
+                && this.engine.equals(newCar.engine);
+    }
+
+    public List<Wheel> getWheels() {
+        return new ArrayList<>(copyWheels(this.wheels));
+    }
+
+    public Engine getEngine() {
+        return this.engine == null
+                ? null
+                : new Engine(engine.getHorsePower(), engine.getManufacturer());
+    }
 
     @Override
     public String toString() {
         return "Car{"
-            + "year=" + year
-            + ", color='" + color + '\''
-            + ", wheels=" + wheels
-            + ", engine=" + engine
-            + '}';
+                + "year=" + year
+                + ", color='" + color + '\''
+                + ", wheels=" + wheels
+                + ", engine=" + engine
+                + '}';
+    }
+
+    public Car addWheel(Wheel wheel) {
+        List<Wheel> newList = new ArrayList<>(this.wheels);
+        newList.add(wheel);
+        return new Car(this.year, this.color, newList, this.engine);
+    }
+
+    public Car changeEngine(Engine otherMaker) {
+        Engine newEngine = new Engine(otherMaker.getHorsePower(), otherMaker.getManufacturer());
+        return new Car(this.year, this.color, this.wheels, newEngine);
+    }
+
+    public Car changeColor(String blue) {
+        return new Car(this.year, blue, this.wheels, this.engine);
+    }
+
+    private List<Wheel> copyWheels(List<Wheel> wheels) {
+        List<Wheel> copy = new ArrayList<>();
+        for (Wheel size: wheels) {
+            copy.add(new Wheel(size.getRadius()));
+        }
+        return copy;
     }
 }

src/main/java/core/basesyntax/Engine.java

@@ -1,16 +1,65 @@
 package core.basesyntax;
 
-public class Engine {
+public class Engine implements Cloneable {
     private int horsePower;
     private String manufacturer;
 
     //implement this class
 
+    public Engine(int horsePower, String manufacturer) {
+        this.horsePower = horsePower;
+        this.manufacturer = manufacturer;
+    }
+
+    public int getHorsePower() {
+        return horsePower;
+    }
+
+    public void setHorsePower(int i) {
+        this.horsePower = i;
+    }
+
+    public String getManufacturer() {
+        return manufacturer;
+    }
+
+    public void setManufacturer(String newMaker) {
+        this.manufacturer = newMaker;
+    }
+
     @Override
     public String toString() {
         return "Engine{"
-            + "horsePower=" + horsePower
-            + ", manufacturer='" + manufacturer + '\''
-            + '}';
+                + "horsePower=" + horsePower
+                + ", manufacturer='" + manufacturer + '\''
+                + '}';
+    }
+
+    @Override
+    protected Engine clone() {
+        try {
+            return (Engine)super.clone();
+        } catch (CloneNotSupportedException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        } else if (obj == null || this.getClass() != obj.getClass()) {
+            return false;
+        }
+        return this.horsePower == ((Engine) obj).horsePower
+                && this.manufacturer == ((Engine) obj).manufacturer;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = 31 * horsePower;
+        result = 31 * result + (manufacturer == null ? 0 : manufacturer.hashCode());
+        return result;
     }
 }

src/main/java/core/basesyntax/Wheel.java

@@ -1,14 +1,48 @@
 package core.basesyntax;
 
-public class Wheel {
+public 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 i) {
+        this.radius = i;
+    }
 
     @Override
     public String toString() {
         return "Wheel{"
-            + "radius=" + radius
-            + '}';
+                + "radius=" + radius
+                + '}';
+    }
+
+    @Override
+    public int hashCode() {
+        return Integer.hashCode(this.radius);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        } else if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+        return this.radius == ((Wheel) obj).radius;
+    }
+
+    @Override
+    protected Wheel clone() {
+        try {
+            return (Wheel) super.clone();
+        } catch (CloneNotSupportedException e) {
+            throw new RuntimeException(e);
+        }
     }
 }

src/test/java/core/basesyntax/CarTest.java

@@ -43,7 +43,7 @@ public void set_isEngineInCarChanged() {
     }
 
     @Test
-    public void carConstructor_checkWheelsAfterAddingToCar() {
+    public void carConstructor_AftecheckWheelsrAddingToCar() {
         List<Wheel> expected = List.of(new Wheel(20), new Wheel(13));
         Car car = new Car(1999, null, expected, testEngine);
         List<Wheel> actual = car.getWheels();