Question

PROGRAM STATEMENT AND REQUIREMENTS: Great Tutors Inc. is a company that provides tutoring services to elementary school students. Parents bring their students after school to their offices where one tutor is assigned to each student. The same tutor is assigned to the student for every visit. A tutor teaches his/her assigned student for several hours and charges a flat rate per hour for any student. Each tutor can only teach for a maximum of 40 hours. The program must ask the tutor to enter the hours taught after each tutoring session and deduct it from the maximum allowed. If the tutor has reached or exceeded the maximum number of hours taught, he or she cannot continue tutoring (charging for the service) The company also needs to know the name and age of each student. The company needs to produce an invoice for the student showing the name of the student, the name of the tutor, hours of instruction, rate per hour, and total amount to pay. If the student is less than 10 years old, a 20% discount must be applied to the amount due. PART 1 (2pts): Using the drawing software of your choice and the technique shown in the lectures to identify classes, methods, and fields, create a UML class diagram for the program described above and save it in a single Microsoft Word file together with a short description of the reasoning for your design as shown in the lectures. Note: Classes for this program are Tutor, Student and invoice. PART 2 (Spts): Implement your UML class diagram in Java to fulfill the program's goals and requirements. • Remember that each class must be coded in a separate file, including the driver class that should be named "Driver" (Hint: there should be 3 classes and a driver class. Check the examples given in class for reference). All class fields must be private, and every class must contain getters, setters, a constructor method, and a toString method showing the state of the object to the user with appropriate messages. Test your program by creating at least 1 instance of all the objects and obtaining an invoice. Format the invoice so it will look organized and shows description prompts for the output. o Use printſ to show only two decimals for numbers. Note: This program needs to have a user input.

Answer 1

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ANSWER:-

Here we have total 3 classes :

1. Teacher.java

package com.teaching;

import java.util.List;

public class Teacher {
        
        private int id;
        private String name;
        private int pay_hour;
        private int teaching_hours;
        private int ongoing_hours;
        private List<Student> students;
        private int total_payout;
        
        
        
        public Teacher(int id,String name, int teaching_hours, int pay_hour) {
                super();
                this.id = id;
                this.name = name;
                this.teaching_hours = teaching_hours;
                this.pay_hour = pay_hour;
        }
        
        
        
        public int getOngoing_hours() {
                return ongoing_hours;
        }



        public void setOngoing_hours(int ongoing_hours) {
                this.ongoing_hours = ongoing_hours;
        }



        public int getPay_hour() {
                return pay_hour;
        }



        public void setPay_hour(int pay_hour) {
                this.pay_hour = pay_hour;
        }



        public int getId() {
                return id;
        }

        public void setId(int id) {
                this.id = id;
        }

        public String getName() {
                return name;
        }
        public void setName(String name) {
                this.name = name;
        }
        public int getTeaching_hours() {
                return teaching_hours;
        }
        public void setTeaching_hours(int teaching_hours) {
                this.teaching_hours = teaching_hours;
        }
        public List<Student> getStudents() {
                return students;
        }
        public void setStudents(List<Student> students) {
                this.students = students;
        }
        public int getTotal_payout() {
                return total_payout;
        }
        public void setTotal_payout(int total_payout) {
                this.total_payout = total_payout;
        }



        @Override
        public String toString() {
                return "Teacher [id=" + id + ", name=" + name + ", pay_hour=" + pay_hour + ", teaching_hours=" + teaching_hours
                                + ", students=" + students + ", total_payout=" + total_payout + "]";
        }

        

        
        
        
        
        
        
        

}

2. Student.java

package com.teaching;

public class Student {
        
        private int id;
        private int age;
        private String name;
        private Teacher teacher;
        public Student(int id, int age, String name, Teacher teacher) {
                super();
                this.id = id;
                this.age = age;
                this.name = name;
                this.teacher = teacher;
        }
        
        public int getId() {
                return id;
        }

        public void setId(int id) {
                this.id = id;
        }

        public int getAge() {
                return age;
        }
        public void setAge(int age) {
                this.age = age;
        }
        public String getName() {
                return name;
        }
        public void setName(String name) {
                this.name = name;
        }
        public Teacher getTeacher() {
                return teacher;
        }
        public void setTeacher(Teacher teacher) {
                this.teacher = teacher;
        }
        @Override
        public String toString() {
                return "Student [id="+id+", age=" + age + ", name=" + name + ", teacher=" + teacher + "]";
        }
        
        
        

}

3. Driver.java

package com.teaching;

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Driver {

        static List<Teacher> teacher_list = new ArrayList<>();
        static List<Student> student_list = new ArrayList<>();
        private static DecimalFormat df2 = new DecimalFormat("#.##");
        static Scanner sc = new Scanner(System.in);

        public static void main(String[] args) {

                while (true) {
                        System.out.println(
                                        "Press 1 to add teacher\nPress 2 to add students\nPress 3 for teaching process : \nPress 4 for generating invoice\nPress 0 to exit");
                        int choice = sc.nextInt();
                        switch (choice) {
                        case 1:
                                addTeacher();
                                break;
                        case 2:
                                addStudent();
                                break;
                        case 3:
                                teachingProcess();
                                break;
                        case 4:
                                generateInvoice();
                                break;
                        case 0:
                                System.exit(0);
                                break;
                        default:
                                System.out.println("Please select a proper choice");
                        }
                }
        }

        private static void generateInvoice() {
                System.out.println("Please enter student id : ");
                int stid = sc.nextInt();
                List<Student> stl = student_list.stream().filter(stu -> stu.getId() == stid).collect(Collectors.toList());
                if (stl.size() == 1) {
                        Student s = stl.get(0);
                        double pay = s.getTeacher().getOngoing_hours() * s.getTeacher().getPay_hour();
                        double discount = 0;
                        if (s.getAge() < 10)
                                discount = pay * 0.1;
                        // pay = Double.valueOf(df2.format(pay*0.9));

                        System.out.println("***************************************\n\n");
                        System.out.println("Invoice");
                        System.out.println("***************************************\n");
                        System.out.println("Student Details : \n\n");
                        System.out.println("Name : " + s.getName());
                        System.out.println("Age : " + s.getAge());
                        System.out.println("Mentor's Name : " + s.getTeacher().getName());
                        System.out.println("Total Teaching Hours : " + s.getTeacher().getOngoing_hours());
                        System.out.println("Total Pay : " + pay);
                        System.out.println("Total Discount : " + discount);
                        System.out.println("Total Payment : " + Double.valueOf(df2.format(pay * 0.9)));
                        System.out.println("***************************************\n\n");
                } else {
                        System.out.println("Please enter a right student id");
                }
        }

        private static void teachingProcess() {
                System.out.println("Please enter Student id : ");
                int id = sc.nextInt();
                List<Student> stl = student_list.stream().filter(stu -> stu.getId() == id).collect(Collectors.toList());
                if (stl.size() == 1) {
                        System.out.println("Please enter teaching hours : ");
                        int hours = sc.nextInt();
                        for (int i = 0; i < teacher_list.size(); i++) {
                                if (stl.get(0).getTeacher().getId() == teacher_list.get(i).getId()) {
                                        int total_h = teacher_list.get(i).getTeaching_hours();
                                        int ongoing_h = teacher_list.get(i).getOngoing_hours();
                                        if (total_h - ongoing_h >= hours)
                                                teacher_list.get(i).setOngoing_hours(ongoing_h + hours);
                                }
                        }
                } else {
                        System.out.println("Please enter a right student id");
                }
        }

        private static void addTeacher() {
                System.out.println("Enter name :");
                String name = sc.next();
                System.out.println("Enter Max teaching hours : ");
                int hours = sc.nextInt();
                System.out.println("Enter per hour fees : ");
                int fees = sc.nextInt();
                Teacher tch = new Teacher(teacher_list.size() + 1, name, hours, fees);
                teacher_list.add(tch);
                System.out.println("Teacher is added successfully. Id is : "+tch.getId());
        }

        private static void addStudent() {
                System.out.println("Enter Name : ");
                String name = sc.next();
                System.out.println("Enter Age : ");
                int age = sc.nextInt();
                Student st = null;
                if (teacher_list.size()!=0) {
                        Random rand = new Random();
                        int num = rand.nextInt(teacher_list.size());
                        st = new Student((student_list.size() + 1), age, name, teacher_list.get(num));
                        List<Student> sl = teacher_list.get(num).getStudents();
                        if(sl==null) {
                                sl = new ArrayList<Student>();
                        }
                        sl.add(st);
                        teacher_list.get(num).setStudents(sl);
                } else
                        st = new Student((student_list.size() + 1), age, name, null);

                student_list.add(st);
                System.out.println("Student is added successfully. Id is : "+st.getId());

        }

}

Output :

Press 1 to add teacher
Press 2 to add students
Press 3 for teaching process : 
Press 4 for generating invoice
Press 0 to exit
1
Enter name :
Soumya
Enter Max teaching hours : 
38
Enter per hour fees : 
150
Teacher is added successfully. Id is : 1
Press 1 to add teacher
Press 2 to add students
Press 3 for teaching process : 
Press 4 for generating invoice
Press 0 to exit
1
Enter name :
Sudeshna
Enter Max teaching hours : 
35
Enter per hour fees : 
120
Teacher is added successfully. Id is : 2
Press 1 to add teacher
Press 2 to add students
Press 3 for teaching process : 
Press 4 for generating invoice
Press 0 to exit
2
Enter Name : 
Kundan
Enter Age : 
8
Student is added successfully. Id is : 1
Press 1 to add teacher
Press 2 to add students
Press 3 for teaching process : 
Press 4 for generating invoice
Press 0 to exit
2
Enter Name : 
Ram
Enter Age : 
12
Student is added successfully. Id is : 2
Press 1 to add teacher
Press 2 to add students
Press 3 for teaching process : 
Press 4 for generating invoice
Press 0 to exit
3
Please enter Student id : 
1
Please enter teaching hours : 
3
Press 1 to add teacher
Press 2 to add students
Press 3 for teaching process : 
Press 4 for generating invoice
Press 0 to exit
3
Please enter Student id : 
2
Please enter teaching hours : 
4
Press 1 to add teacher
Press 2 to add students
Press 3 for teaching process : 
Press 4 for generating invoice
Press 0 to exit
4
Please enter student id : 
1
***************************************


Invoice
***************************************

Student Details : 


Name : Kundan
Age : 8
Mentor's Name : Sudeshna
Total Teaching Hours : 7
Total Pay : 840.0
Total Discount : 84.0
Total Payment : 756.0
***************************************
Press 1 to add teacher
Press 2 to add students
Press 3 for teaching process : 
Press 4 for generating invoice
Press 0 to exit
0