Initial commit for 5.2

src/main/java/_5/_2/Bill/Bill.java

@@ -0,0 +1,64 @@
+package _5._2.Bill;
+
+import _5._2.CarComponents.*;
+
+public class Bill {
+    private Billtem[] items;
+
+    public Bill(Billtem[] items) {
+        this.items = items;
+    }
+
+    public double getTotalPrice() {
+        double price = 0;
+        for (Billtem i : items) {
+            price += i.getPrice();
+        }
+
+        return price;
+    }
+
+    public String toString() {
+        String string = "";
+        for (Billtem i : items) {
+            string += i.toString() + "\n";
+        }
+        double price = this.getTotalPrice();
+        string += "Total: " + price;
+        return string;
+    }
+
+
+    public static class Billtem {
+        private double price;
+        private CarComponent item;
+
+        public Billtem(CarComponent item, double price) {
+            this.item = item;
+            this.price = price;
+        }
+
+        public double getPrice() {
+            return price;
+        }
+
+        public String toString() {
+            return item.getName() + getComponents() + ": " + price;
+        }
+
+
+        public String getComponents() {
+            CarComponent[] components = item.getComponents();
+            String names = "";
+
+            if (components != null) {
+                names += "(";
+                for (CarComponent i : components) {
+                    names += i.getName() + " ";
+                }
+                names += ")";
+            }
+            return names;
+        }
+    }
+}

src/main/java/_5/_2/Bill/TestBill.java

@@ -0,0 +1,21 @@
+package _5._2.Bill;
+
+import _5._2.CarComponents.*;
+
+public class TestBill {
+    public static void main(String[] args) {
+        Motor m = new Motor("Motor",null);
+        Car c = new Car("Rolls Royce",new CarComponent[] {m});
+        Seat s = new Seat("Seat",null);
+        Wheel w1 = new Wheel("Wheel",null);
+        Wheel w2 = new Wheel("Wheel",null);
+        Wheel w3 = new Wheel("Wheel",null);
+        Wheel w4 = new Wheel("Wheel",null);
+
+        Bill.Billtem[] billtems = new Bill.Billtem[]{new Bill.Billtem(c, 100000.0), new Bill.Billtem(s,2000.0), new Bill.Billtem(w1, 1000.0), new Bill.Billtem(w2, 1000.0), new Bill.Billtem(w3, 1000.0), new Bill.Billtem(w4, 1000.0)};
+        Bill bill = new Bill(billtems);
+
+        String billprice = bill.toString();
+        System.out.println(billprice);
+    }
+}

src/main/java/_5/_2/CarComponents/Car.java

@@ -0,0 +1,19 @@
+package _5._2.CarComponents;
+
+public class Car implements CarComponent {
+    private String name;
+    private CarComponent[] components;
+
+    public Car(String name, CarComponent[] components) {
+        this.name = name;
+        this.components = components;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public CarComponent[] getComponents() {
+        return components;
+    }
+}

src/main/java/_5/_2/CarComponents/CarComponent.java

@@ -0,0 +1,6 @@
+package _5._2.CarComponents;
+
+public interface CarComponent {
+    String getName();
+    CarComponent[] getComponents();
+}

src/main/java/_5/_2/CarComponents/CarPart.java

@@ -0,0 +1,19 @@
+package _5._2.CarComponents;
+
+public abstract class CarPart implements CarComponent {
+    private String name;
+    private CarComponent[] components;
+
+    public CarPart(String name,CarComponent[] components) {
+        this.name = name;
+        this.components = components;
+    }
+//
+    public String getName() {
+        return name;
+    }
+
+    public CarComponent[] getComponents() {
+        return components;
+    }
+}

src/main/java/_5/_2/CarComponents/Motor.java

@@ -0,0 +1,7 @@
+package _5._2.CarComponents;
+
+public final class Motor extends CarPart {
+    public Motor(String name,CarComponent[] components) {
+        super(name,components);
+    }
+}

src/main/java/_5/_2/CarComponents/Seat.java

@@ -0,0 +1,7 @@
+package _5._2.CarComponents;
+
+public final class Seat extends CarPart {
+    public Seat(String name,CarComponent[] components) {
+        super(name,components);
+    }
+}

src/main/java/_5/_2/CarComponents/Wheel.java

@@ -0,0 +1,7 @@
+package _5._2.CarComponents;
+
+public final class Wheel extends CarPart {
+    public Wheel(String name,CarComponent[] components) {
+        super(name,components);
+    }
+}