interfaces and abstract classes lab

README.md

@@ -337,3 +337,8 @@ Once you finish the assignment, submit a URL link to your repository or your pul
 
 </details>
 
+## IntArrayList vs IntVector
+
+IntArrayList can be more efficient when I do not need the list to grow very fast. It starts with 10 spaces and only grows by 50%, so it can avoid wasting too much unused space.
+
+IntVector can be more efficient when I need to add many numbers quickly. It starts with 20 spaces and doubles its size when it is full, so it resizes less often than IntArrayList.

src/BigDecimalOperations.java

@@ -0,0 +1,16 @@
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
+public class BigDecimalOperations {
+
+    public double roundingToHundredth(BigDecimal number) {
+        BigDecimal result = number.setScale(2, RoundingMode.HALF_UP);
+        return result.doubleValue();
+    }
+
+    public BigDecimal reverseAndRound(BigDecimal number) {
+        BigDecimal result = number.negate();
+        result = result.setScale(1, RoundingMode.HALF_UP);
+        return result;
+    }
+}

src/Car.java

@@ -0,0 +1,56 @@
+public abstract class Car {
+    private String vinNumber;
+    private String make;
+    private String model;
+    private int mileage;
+
+    public Car(String vinNumber, String make, String model, int mileage) {
+        this.vinNumber = vinNumber;
+        this.make = make;
+        this.model = model;
+        this.mileage = mileage;
+    }
+
+    public String getVinNumber() {
+        return vinNumber;
+    }
+
+    public void setVinNumber(String vinNumber) {
+        this.vinNumber = vinNumber;
+    }
+
+    public String getMake() {
+        return make;
+    }
+
+    public void setMake(String make) {
+        this.make = make;
+    }
+
+    public String getModel() {
+        return model;
+    }
+
+    public void setModel(String model) {
+        this.model = model;
+    }
+
+    public int getMileage() {
+        return mileage;
+    }
+
+    public void setMileage(int mileage) {
+        this.mileage = mileage;
+    }
+
+    @Override
+    public String toString() {
+        return "Car{" +
+                "vinNumber='" + vinNumber + '\'' +
+                ", make='" + make + '\'' +
+                ", model='" + model + '\'' +
+                ", mileage=" + mileage +
+                '}';
+    }
+}
+

src/IntArrayList.java

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+public class IntArrayList implements IntList {
+
+    private int[] numbers;
+    private int size;
+
+    public IntArrayList() {
+        numbers = new int[10];
+        size = 0;
+    }
+
+    public void add(int number) {
+        if (size == numbers.length) {
+            int[] newNumbers = new int[numbers.length + numbers.length / 2];
+
+            for (int i = 0; i < numbers.length; i++) {
+                newNumbers[i] = numbers[i];
+            }
+
+            numbers = newNumbers;
+        }
+
+        numbers[size] = number;
+        size++;
+    }
+
+    public int get(int id) {
+        return numbers[id];
+    }
+}

src/IntList.java

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+public interface IntList {
+
+    void add(int number);
+
+    int get(int id);
+}

src/IntVector.java

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+public class IntVector implements IntList {
+
+    private int[] numbers;
+    private int size;
+
+    public IntVector() {
+        numbers = new int[20];
+        size = 0;
+    }
+
+    public void add(int number) {
+        if (size == numbers.length) {
+            int[] newNumbers = new int[numbers.length * 2];
+
+            for (int i = 0; i < numbers.length; i++) {
+                newNumbers[i] = numbers[i];
+            }
+
+            numbers = newNumbers;
+        }
+
+        numbers[size] = number;
+        size++;
+    }
+
+    public int get(int id) {
+        return numbers[id];
+    }
+}

src/Main.java

@@ -0,0 +1,54 @@
+import java.math.BigDecimal;
+
+public class Main {
+
+    public static void main(String[] args) {
+        BigDecimalOperations operations = new BigDecimalOperations();
+
+        BigDecimal number1 = new BigDecimal("4.2545");
+        double result1 = operations.roundingToHundredth(number1);
+        System.out.println(result1);
+
+        BigDecimal number2 = new BigDecimal("1.2345");
+        BigDecimal result2 = operations.reverseAndRound(number2);
+        System.out.println(result2);
+
+        BigDecimal number3 = new BigDecimal("-45.67");
+        BigDecimal result3 = operations.reverseAndRound(number3);
+        System.out.println(result3);
+
+        Sedan sedan = new Sedan("VIN123", "Toyota", "Corolla", 50000);
+        UtilityVehicle utilityVehicle = new UtilityVehicle("VIN456", "Jeep", "Wrangler", 30000, true);
+        Truck truck = new Truck("VIN789", "Ford", "F150", 70000, 3500);
+
+        System.out.println(sedan.toString());
+        System.out.println(utilityVehicle.getInfo());
+        System.out.println(truck.getInfo());
+
+        TvSeries tvSeries = new TvSeries("Breaking Bad", 45, 62);
+        Movie movie = new Movie("Inception", 148, 8.8);
+
+        System.out.println(tvSeries.getInfo());
+        System.out.println(movie.getInfo());
+
+        IntList list1 = new IntArrayList();
+
+        list1.add(10);
+        list1.add(20);
+        list1.add(30);
+
+        System.out.println(list1.get(0));
+        System.out.println(list1.get(1));
+        System.out.println(list1.get(2));
+
+        IntList list2 = new IntVector();
+
+        list2.add(100);
+        list2.add(200);
+        list2.add(300);
+
+        System.out.println(list2.get(0));
+        System.out.println(list2.get(1));
+        System.out.println(list2.get(2));
+    }
+}

src/Movie.java

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+public class Movie extends Video {
+
+    private double rating;
+
+    public Movie(String title, int duration, double rating) {
+        super(title, duration);
+        this.rating = rating;
+    }
+
+    public double getRating() {
+        return rating;
+    }
+
+    public void setRating(double rating) {
+        this.rating = rating;
+    }
+
+    public String getInfo() {
+        return super.getInfo() + ", Rating: " + rating;
+    }
+}

src/Sedan.java

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+public class Sedan extends Car {
+
+    public Sedan(String vinNumber, String make, String model, int mileage) {
+        super(vinNumber, make, model, mileage);
+    }
+}

src/Truck.java

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+public class Truck extends Car {
+
+    private double towingCapacity;
+
+    public Truck(String vinNumber, String make, String model, int mileage, double towingCapacity) {
+        super(vinNumber, make, model, mileage);
+        this.towingCapacity = towingCapacity;
+    }
+
+    public double getTowingCapacity() {
+        return towingCapacity;
+    }
+
+    public void setTowingCapacity(double towingCapacity) {
+        this.towingCapacity = towingCapacity;
+    }
+
+    public String getInfo() {
+        return super.toString() + ", Towing capacity: " + towingCapacity;
+    }
+}

src/TvSeries.java

@@ -0,0 +1,21 @@
+public class TvSeries extends Video {
+
+    private int episodes;
+
+    public TvSeries(String title, int duration, int episodes) {
+        super(title, duration);
+        this.episodes = episodes;
+    }
+
+    public int getEpisodes() {
+        return episodes;
+    }
+
+    public void setEpisodes(int episodes) {
+        this.episodes = episodes;
+    }
+
+    public String getInfo() {
+        return super.getInfo() + ", Episodes: " + episodes;
+    }
+}

src/UtilityVehicle.java

@@ -0,0 +1,21 @@
+public class UtilityVehicle extends Car {
+
+    private boolean fourWheelDrive;
+
+    public UtilityVehicle(String vinNumber, String make, String model, int mileage, boolean fourWheelDrive) {
+        super(vinNumber, make, model, mileage);
+        this.fourWheelDrive = fourWheelDrive;
+    }
+
+    public boolean isFourWheelDrive() {
+        return fourWheelDrive;
+    }
+
+    public void setFourWheelDrive(boolean fourWheelDrive) {
+        this.fourWheelDrive = fourWheelDrive;
+    }
+
+    public String getInfo() {
+        return super.toString() + ", Four wheel drive: " + fourWheelDrive;
+    }
+}

src/Video.java

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+public class Video {
+    private String title;
+    private int duration;
+
+    public Video(String title, int duration) {
+        this.title = title;
+        this.duration = duration;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public int getDuration() {
+        return duration;
+    }
+
+    public void setDuration(int duration) {
+        this.duration = duration;
+    }
+
+    public String getInfo() {
+        return "Video{" +
+                "title='" + title + '\'' +
+                ", duration=" + duration +
+                '}';
+    }
+}