Hacks Unit 5,9,10 - Rohit, Nathan, Jun

// UNIT 5

import java.util.*;

public class Car {
    
    private String carBrand;
    private String modelName;
    private String modelYear;
    private int carMileage = 0;

    private int carId = 0;
    private static int carsForSale = 0;
    private static ArrayList<Car> carsInMarket = new ArrayList<Car>();    

    /**
     * Constructor with 3 arguments
     * @param carBrand
     * @param modelName
     * @param modelYear
     * 
     * everytime this method is called, car id is added and a new car is added to the array
     */
    public Car(String carBrand, String modelName, String modelYear, int carMileage){
        this.carBrand = carBrand;
        this.modelName = modelName;
        this.modelYear = modelYear;
        this.carMileage = carMileage;
        carId = uniqueID();
        Car.carsInMarket.add(this);
    }

    /**
     * 
     * @return number of cars
     */
    public static int getCarsCount(){
        return Car.carsInMarket.size();
    }

    /**
     * 
     * @return unique id for each car
     */
    private int uniqueID(){
        Random randid = new Random();
        carId = randid.nextInt(9999);
        return carId;
    }

    /**
     * 
     * @return calling the car array
     */
    public static List<Car> getCarsInMarket(){
        return Car.carsInMarket;
    }
    
    /**
     * printing the object
     */
    public String toString(){
        return "Id: " + carId +  " Brand: " + carBrand + " Model: " + modelName + " Year: " + modelYear + " Mileage: " + carMileage;
    }

    public static void main(String[] args){

        System.out.println("Car available: " + Car.getCarsCount());

        Car BMWX1 = new Car("BMW","X1","2002",30);

        Car HondaCRV = new Car("Honda","CRV","2015",40);


        for(int i = 0; i < Car.getCarsCount(); i++){
            System.out.println((Car.getCarsInMarket().get(i)));
        }

        System.out.println("Car available: " + Car.getCarsCount());
        
    } 
}
Car.main(null);

Car available: 0
Id: 3967 Brand: BMW Model: X1 Year: 2002 Mileage: 30
Id: 667 Brand: Honda Model: CRV Year: 2015 Mileage: 40
Car available: 2

// UNIT 9 PART 1

class Vehicle {

    public String name; 

    public Vehicle(String name){
        this.name = name;
    }

    public void honk(){
        System.out.println("HONK MEEP BEEEEEEEP!");
    }
}

class Car extends Vehicle {
    public Car(String name){
        super(name);
    }
    // methods and attributes

}

public class Main {
    public static void main(String[] args) {
        Car car1 = new Car("Lexus GS430");

        car1.honk();
        System.out.println(car1.name);
    }
}
Main.main(null);

HONK MEEP BEEEEEEEP!
Lexus GS430

//  UNIT 9 PART 2

// Parent class
public class Animal {
    protected String name;
    protected int age;

    public Animal(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public void speak() {
        System.out.println("I AM AN ANIMALIO!!!!!!!!");
    }
}

// Subclass 1
public class Turtle extends Animal {
    private String breed;

    public Turtle(String name, int age, String breed) {
        super(name, age);
        this.breed = breed;
    }

    @Override
    public void speak() {
        System.out.println("Turtle Noises Commence");
    }

    public void eat() {
        System.out.println("I nomp lettuce.");
    }
}

// Subclass 2
public class Cat extends Animal {
    private boolean isIndoor;

    public Cat(String name, int age, boolean isIndoor) {
        super(name, age);
        this.isIndoor = isIndoor;
    }

    @Override
    public void speak() {
        System.out.println("Meow!");
    }

    public void scratch() {
        System.out.println("I am scratching the furniture.");
    }
}

// Tester method
public class AnimalTester {
    public static void main(String[] args) {
        Animal animal1 = new Turtle("Shellby", 3, "Russian Tortoise");
        Animal animal2 = new Cat("Whiskers", 2, true);

        animal1.speak();
        ((Turtle) animal1).eat();
        System.out.println(animal1.name);

        animal2.speak();
        ((Cat) animal2).scratch();
        System.out.println(animal2.age);
    }
}
AnimalTester.main(null);

Turtle Noises Commence
I nomp lettuce.
Shellby
Meow!
I am scratching the furniture.
2

// UNIT 10

public class Fibonacci {
    public static long fib(long n) {
       if ((n == 0) || (n == 1))
          return n;
       else
          return fib(n - 1) + fib(n - 2);
    }
    public static void main(String[] args) {
       System.out.println("The 0th fibonacci number is: " + fib(0));
       System.out.println("The 7th fibonacci number is: " + fib(7));
       System.out.println("The 12th fibonacci number is: " + fib(12));
    }
 }

 Fibonacci.main(null);

The 0th fibonacci number is: 0
The 7th fibonacci number is: 13
The 12th fibonacci number is: 144