4. Consider the following classes: public class Animal { public Animal(String itsNane) { name public void setName (String itsName) { name public String getName () { return name; } itsNane; } = itsName; %3D } www private String name; public class Dog extends Animal public Dog(String itsName) { super(itsName + "Dog"); sound = "Bark!"; { } public void setSound (String itsSound) { sound = public String getsound () { return (getNane (0) + sound); public String getName,(int choice) { if(choice > 0) return super getName() ; else itsSound; } wwww wA } wwww "AnyDog"; public String getName () { return super.getName () + "OK"; } private String sound; } In addition, the following lines of code has been placed in a main class public static void main(String[] args) Animal al = new Animal("Tweety"); { Animal a2 = new Dog ("Rover"); Dog d1 = new Dog("Spot"); } Give the values of the following expressions. If an expression is erroneous, state why. a) al.getName () i) d1 instanceof Animal j) al instanceof Dog k) al.getSound () b) a2.getName () c) a2.getName (0)

Incorrect Question 4 Consider public class Species { } // fields private String name; private int population; private double growthRate; // constructor public Species () { } name = "No Name Yet"; population = 0; growthRate = 33.3; Which of the following is the best setter method for the population instance variable? public boolean setPopulation(int newPopulation) { } if (newPopulation>= 0) { } population = newPopulation; return false; } return true; public public void setPopulation (int newPopulation) if (newPopulation>= 0) { } population newPopulation; public void setPopulation (int newPopulation) { population } = newPopulation;

public class Cat extends Pet {   private String breed;    public void setBreed(String userBreed) {      breed = userBreed;   }    public String getBreed() {      return breed;   }} public class Pet {    protected String name;   protected int age;    public void setName(String userName) {      name = userName;   }    public String getName() {      return name;   }    public void setAge(int userAge) {      age = userAge;   }    public int getAge() {      return age;   }    public void printInfo() {      System.out.println("Pet Information: ");      System.out.println("   Name: " + name);      System.out.println("   Age: " + age);   } } import java.util.Scanner; public class PetInformation {   public static void main(String[] args) {        Scanner scnr = new Scanner(System.in);         // create a generic Pet and a Cat        Pet myPet = new Pet();        Cat myCat = new Cat();         // declare variables for pet and cat info        String petName, catName, catBreed;        int petAge,…

class IndexItem { public: virtual int count() = 0; virtual void display()= 0; };class Book : public IndexItem { private: string title; string author; public: Book(string title, string author): title(title), author(author){} virtual int count(){ return 1; } virtual void display(){ /* YOU DO NOT NEED TO IMPLEMENT THIS FUNCTION */ } };class Category: public IndexItem { private: /* fill in the private member variables for the Category class below */ ? int count; public: Category(string name, string code): name(name), code(code){} /* Implement the count function below. Consider the use of the function as depicted in main() */ ? /* Implement the add function which fills the category with contents below. Consider the use of the function as depicted in main() */ ? virtualvoiddisplay(){ /* YOU DO NOT NEED TO IMPLEMENT THIS FUNCTION */ } };

Consider the following class definition: class circle { public: void print() const; void setRadius(double); void setCenter(double, double); void getCenter(double&, double&); double getRadius(); double area(); circle(); circle(double, double, double); double, double); private: double xCoordinate; double yCoordinate; double radius; } class cylinder: public circle { public: void print() const; void setHeight(double); double getHeight(); double volume(); double area(); cylinder(); cylinder(double, double, private: double height; } Suppose that you have the declaration: cylinder newCylinder;   Write the definitions of the member functions of the classes circle and cylinder. Identify the member functions of the class cylinder that overrides the member functions of the class circle

public abstract class Shape {      public Shape() { }      public abstract double area() ;      public String who() { return "Shape" ; } }     public class Circle extends Shape {      private int radius ;      public Circle( int r )      {          radius = r ;      }            @Override      public double area()      {         return Math.PI * radius * radius ;      } }     public class Square extends Shape {      private int _sideLength ;      public Square( int sideLength )      {          /* TODO question 45 */      }      @Override      public double area()      {           return _sideLength * _sideLength ;      } } Implement the Square constructor, and make sure it throws an exception when the input parameter is not a valid length.  The input parameter must be positive to be considered valid.