I need this to work in BlueJ Go off this code: public abstract class Employee { private String firstName; private String lastName; private String SSN; double salary; public Employee( String first, String last, String ssn ) { firstName = first; lastName = last; SSN = ssn; } public void setfirstName( String first ) { firstName = first; // should validate } public String getfirstName() { return firstName; } public void setlastName( String last ) { lastName = last; // should validate } public String getlastName() { return lastName; } public void setSSN( String ssn ) { this.SSN = ssn; } public String getSSN() { return SSN; } @Override public String toString() { return String.format( "%-12s%-12s%-12s", getfirstName(), getlastName(), getSSN() ); } public abstract double earnings(); }

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,…

Finish the constructor for the KickBall class. public class Ball { public double diameter; public Ball(double diam) { diameter = diam; public class KickBall extends Ball private Color ballColor; public KickBall(double diam, Color ballColor) {

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.