Question

The class Engineer Test below is used to test two other class named Project & Engineer. A project has three attributes: projNo (int), projName (string), revenue (double). Add a parameterized constructor, and setters & getters for all attributes. An engineer has four attributes: jobld (int), name (string), rate (double), and a list of projects. For each project, the engineer has a specific amount as profit (project revenue rate). Add a constructor that initializes the attributes: jobild, name and rate. Implement the method addProject(project) that takes a Project object as a parameter and adds it to the list of projects. The method returns nothing Add a method getProfit() that returns the total profit of the engineer, which is the engineer's total projects' revenues (depending on their rate). Write the classes Project & Engineer so that the code below compiles without error and gives the results shown below. public class Engineer Test { public static void main(String[] args) { Engineer fatin - now Engineer(1, "Fatima", 8.3); Engineer bayan - new Engineer(2, "Bayan", 0.2); Project wall - new Project(101, "Doha Mall", 2000000); Project cinema - new Project (202, "Khor Cinema", 500000); Project theater = new Project(303,"akra Theater", 300000); Project bowling - new project(404, "Bowling Center", 500000); Project skating - neue Project(ses, "Skating Arena", 400000); fatima.addProject(all); fatima.addProject(cinema); fatima.addProject(theater); System.out.printf("latina's Total Profit - %.2f OR\n", fatima.getProfit()); System.out.println(". bayan.addProject(bowling): bayan.addProject(skating); bayan.addProject(mall); System.out.printf("Bayan's Total Profit - %.2f QRU", bayan.getProfit()); System.out.println(" ) > Output results Submission Instructions: You should submit a Word file that has: The class Project The class Engineer Screenshot of the output

Answer 1

EngineerTest.class

public class EngineerTest {
    public static void main(String[] args) {

        Engineer fatima = new Engineer(1, "Fatima", 0.3);
        Engineer bayan = new Engineer(2, "Bayan", 0.2);

        Project mall = new Project(101, "Doha Mall", 2000000);
        Project cinema = new Project(202, "Khor Cinema", 500000);
        Project theater = new Project(303, "Wakra Theater", 300000);
        Project bowling = new Project(404, "Bowling Center", 500000);
        Project skating = new Project(505, "Skating Arena", 400000);

        fatima.addProject(mall);
        fatima.addProject(cinema);
        fatima.addProject(theater);
        System.out.printf("Fatima's Total Profit = %.2f QR\n", fatima.getProfit());

        System.out.println("-----------------------------------------");

        bayan.addProject(bowling);
        bayan.addProject(skating);
        bayan.addProject(mall);
        System.out.printf("Bayan's Total Profit = %.2f QR\n", bayan.getProfit());

        System.out.println("-----------------------------------------");

    }
}

Project.class

public class Project {
    private  int projNo;
    private String projname;
    private double revenue;

    //constructor to initialize variables using setters()
    public Project(int projNo, String projname, double revenue) {
        setProjNo(projNo);
        setProjname(projname);
        setRevenue(revenue);
    }

    public int getProjNo() {
        return projNo;
    }

    public void setProjNo(int projNo) {
        this.projNo = projNo;
    }

    public String getProjname() {
        return projname;
    }

    public void setProjname(String projname) {
        this.projname = projname;
    }

    public double getRevenue() {
        return revenue;
    }

    public void setRevenue(double revenue) {
        this.revenue = revenue;
    }
}

Engineer.class

import java.util.ArrayList;
import java.util.List;

public class Engineer {
    private int jobId;
    private String name;
    private double rate;
    private List<Project> projList= new ArrayList<>();

    //constructor to initialize the variables
    public Engineer(int jobId, String name, double rate) {
        this.jobId = jobId;
        this.name = name;
        this.rate = rate;
    }

    //method to add projects to the array list projList  of type Project
    void addProject(Project p){
        projList.add(p);
    }

    //float return type used since %.2f is used in main() to format the number to 2 decimal places
    float getProfit(){
        float profit=0.0f;
        /**
         * Forloop that takes each project from project list as object and stores in variable p
         * getter method of Project class getRevenue() called to get revenue of respective projects
         * Add all the project revenue with the rate of engineer
         * Sum of the results stored in variable profit on each iteration
         */
        for(Project p : projList){
            profit+=p.getRevenue()*rate;
        }
        return profit;
    }
}

Output

Fatima's Total Profit 840000.00 QR Bayan's Total Profit = 580000.00 QR

Explanation

The EngineerTest class creates two engineer objects that initializes the constructor in the Engineer class. Whenever the engineer class is called with the object name. the values that was initialized with that object can be retrieved.

In the next step many project objects are created in Engineer class and values are initialized using the constructor defined. Each engineer object is used to add a project by passing the project object to the addProject() which creates a list of projects under that engineer object. And finally for each Engineer object, the getprofit() is called. In that function, the revenue for the projects assigned to an engineer is fetched from the project class using the getter method getRevenue() and is added with the rate of the respective engineer. The result is then returned back and printed.

Working

When the getProfit() method called for fatima object which has the following projects added,

Project	Revenue
mall	2000000
cinema	500000
theater	300000

Rate of engineer fatima per project = 0.3

So the result will be calculated as 200000*0.3 + 500000*0.3 + 300000*0.3 = 840000.00

The same will be applied in case of Bayan.

Hope this answer helped. A like would be appreciated. Thank You :)