Question

PLEASE WRITE IN JAVA FOR Q's A & B: Three investors are starting a new startup. Each investor has a first name, last name and phone number all of type String and the amount of investment dollars of type double.

A.) Write an Investor class that includes the above information. 1.) Make the instance variable of the investor class private. 2.) Write getter and setter methods for each instance variable. 3.) Add a constructor method to the investor class that receives values for all instance variable as parameters.

B.) Write an InvestorTest class that creates an array of Investor objects to save the information of the three investors. 1.) Use a loop to read the values for each investor objects from the keyboard and create the objects. 2.) Use an enhanced for loop to print the values of the instance variables of each investor. 3.) Write a method called percentages which receives the array of investors as a parameter and returns an ArrayList of double numbers that contains the percentage of shares of each investor. 4.) Call the percentages method and print its returned values.

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

// Investor.java

public class Investor {

      // fields

      private String firstName;

      private String lastName;

      private String phoneNumber;

      private double investment;

      // constructor to initialize all fields

      public Investor(String firstName, String lastName, String phoneNumber,

                  double investment) {

            this.firstName = firstName;

            this.lastName = lastName;

            this.phoneNumber = phoneNumber;

            this.investment = investment;

      }

      // getters and setters

      public String getFirstName() {

            return firstName;

      }

      public void setFirstName(String firstName) {

            this.firstName = firstName;

      }

      public String getLastName() {

            return lastName;

      }

      public void setLastName(String lastName) {

            this.lastName = lastName;

      }

      public String getPhoneNumber() {

            return phoneNumber;

      }

      public void setPhoneNumber(String phoneNumber) {

            this.phoneNumber = phoneNumber;

      }

      public double getInvestment() {

            return investment;

      }

      public void setInvestment(double investment) {

            this.investment = investment;

      }

}

// InvestorTest.java

import java.util.ArrayList;

import java.util.Scanner;

public class InvestorTest {

      // method to calculate the percentages of shares of each investor

      public static ArrayList<Double> percentages(Investor investors[]) {

            // array list to store the results

            ArrayList<Double> percents = new ArrayList<Double>();

            double sum = 0;

            // looping through array once, and summing all the investment values to

            // get total investment

            for (Investor inv : investors) {

                  sum += inv.getInvestment();

            }

            // looping through the array again

            for (Investor inv : investors) {

                  // finding investment percentage, adding to array list

                  double sharePercent = (inv.getInvestment() / sum) * 100.0;

                  percents.add(sharePercent);

            }

            return percents;

      }

      public static void main(String[] args) {

            // creating an array of 3 investors

            Investor array[] = new Investor[3];

            Scanner scanner = new Scanner(System.in);

            // looping and reading values and filling array

            for (int i = 0; i < array.length; i++) {

                  System.out.print("Enter first name of investor #" + (i + 1) + ": ");

                  String first = scanner.nextLine();

                  System.out.print("Enter last name of investor #" + (i + 1) + ": ");

                  String last = scanner.nextLine();

                  System.out.print("Enter phone number of investor #" + (i + 1)

                              + ": ");

                  String phone = scanner.nextLine();

                  System.out.print("Enter investment amount of investor #" + (i + 1)

                              + ": ");

                  double amt = Double.parseDouble(scanner.nextLine());

                  // creating an Investor with entered values

                  Investor investor = new Investor(first, last, phone, amt);

                  array[i] = investor;

            }

            // using an enhanced for loop, printing data of each investor

            for (Investor inv : array) {

                  System.out.println("investor first name: " + inv.getFirstName());

                  System.out.println("investor last name: " + inv.getLastName());

                  System.out

                              .println("investor phone number: " + inv.getPhoneNumber());

                  System.out.println("Investment amount: " + inv.getInvestment());

                  System.out.println();

            }

            System.out.println("Investment percentages: ");

            int i = 1;

            // getting percentages, looping through each percentage

            for (double p : percentages(array)) {

                  // displaying investor number and sharee percentage formatted to 2

                  // decimal places

                  System.out.printf("investor #%d: %.2f%%\n", i, p);

                  i++;

            }

      }

}

/*OUTPUT*/

Enter first name of investor #1: Oliver

Enter last name of investor #1: Queen

Enter phone number of investor #1: 123-999

Enter investment amount of investor #1: 50000

Enter first name of investor #2: John

Enter last name of investor #2: Diggle

Enter phone number of investor #2: 444-1627

Enter investment amount of investor #2: 25000

Enter first name of investor #3: Barry

Enter last name of investor #3: Allen

Enter phone number of investor #3: 444-4444

Enter investment amount of investor #3: 25000

investor first name: Oliver

investor last name: Queen

investor phone number: 123-999

Investment amount: 50000.0

investor first name: John

investor last name: Diggle

investor phone number: 444-1627

Investment amount: 25000.0

investor first name: Barry

investor last name: Allen

investor phone number: 444-4444

Investment amount: 25000.0

Investment percentages:

investor #1: 50.00%

investor #2: 25.00%

investor #3: 25.00%