Question

1. Consider the following interface:
interface Duty
{
public String getDuty();
}
a. Write a class called Student which implements Duty. Class Student adds 1 data field, id, and 2
methods, getId and setId, along with a 1-argument constructor. The duty of a Student is to study
40 hours a week.
b. Write a class called Professor which implements Duty. Class Professor adds 1 data field, name,
and 2 methods, getName and setName, along with a 1-argument constructor. The duty of a
Professor is to return homework on time.
c. Complete the following program:
public class DutyApp

{
//Desc: A program which allows the user to create either a Student or a Professor.
// The program displays a menu asking for 1. Student, 2. Professor, 3. Quit. The
// user enters 1 or 2, followed by the id or name of the person. The program prints the duty
// of the person, and then asks the user to enter 1, 2, or 3 again. The program will continue
// until the user selects 3 to quit.
//Input: The user enters 1 or 2 followed by the id or name of the person via the keyboard.
//Output:For each person entered by the user, the duty of the person displayed on the screen
public static void main(String[] args)

{

Scanner f=new Scanner(System.in);
int response =0;
Duty person;
while (true)
{
System.out.print("1. Student, 2. Professor, 3. Quit: ");
response =f.nextInt();
f.nextLine(); //WHY????
if (response==3) break;
if (response==1) person =getStudent(f);
else person =getProfessor(f);
System.out.println(person.getDuty());
}
}
//Input: The user enters the id of the Student via the keyboard.
//Post: One line read from f
//Return: The Student with the input id.
// ** you need to write this method getStudent
//Input: The user enters the name of the Professor via the keyboard.
//Post: One line read from f
//Return: The Professor with the input name.
// ** you need to write this methof getProfessor
}

Note:
 Put all 4 classes in the same file (Duty, Student, Professor, and DutyApp)
 You CANNOT modify the above main method.
Hand in:
 DutyApp.java.

Answer 1

import java.util.Scanner;

interface Duty
{
    public String getDuty();
}

class Student implements Duty {
    String id;
    public Student(String id) {
        this.id = id;
    }
    String getId() { return id; }
    void setId(String id) { this.id=id; }
    
    public String getDuty() {
        return "study 40 hours a week";
    }
}

class Professor implements Duty {
    private String name;

    public Professor(String name){
        this.name = name;
    }
    public String getName() {
        return this.name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getDuty() {
        return "Return homework on time";
    }
}


public class DutyApp {
    
    //Desc: A program which allows the user to create either a Student or a Professor.
    // The program displays a menu asking for 1. Student, 2. Professor, 3. Quit. The
    // user enters 1 or 2, followed by the id or name of the person. The program prints the duty
    // of the person, and then asks the user to enter 1, 2, or 3 again. The program will continue
    // until the user selects 3 to quit.
    //Input: The user enters 1 or 2 followed by the id or name of the person via the keyboard.
    //Output:For each person entered by the user, the duty of the person displayed on the screen
    public static void main(String[] args) {

        Scanner f=new Scanner(System.in);
        int response =0;
        Duty person;
        while (true) {
            System.out.print("1. Student, 2. Professor, 3. Quit: ");
            response =f.nextInt();
            f.nextLine(); // So that the new line gets cleared from input buffer
            if (response==3) break;
            if (response==1) person = getStudent(f);
            else person = getProfessor(f);
            System.out.println(person.getDuty());
        }
    }
    
    //Input: The user enters the id of the Student via the keyboard.
    //Post: One line read from f
    //Return: The Student with the input id.
    // ** you need to write this method getStudent
    public static Student getStudent(Scanner sc) {
        System.out.println("Enter student id: ");
        String id = sc.nextLine();
        return new Student(id);
    }    
    
    //Input: The user enters the name of the Professor via the keyboard.
    //Post: One line read from f
    //Return: The Professor with the input name.
    // ** you need to write this methof getProfessor
    public static Professor getProfessor(Scanner sc) {
        System.out.println("Enter Professor name: ");
        String name = sc.nextLine();
        return new Professor(name);
    }    
}

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