Question

Create a Business class: Instance variables: Student id 1000 - 9999 Student name Present Student email address Present Number of hours 3.5 - 18 Two constructors should be coded, one that accepts no arguments and sets every field to its default value, and one that accepts all four fields, and assigns the passed values into the instance variables. For each instance variable create two methods; a getter and a setter. Add a static method to the class that will accept the number of hours as an argument. In this static method, multiply the number of hours by 60.50 and return the result.

Create a Presentation class: The presentation class will ask the user to input information into the four fields listed above and validate those fields. That information will be passed over to the business class using the constructor. This class with be divided into methods and tested for valid data. Your presentation class will display all the values from the four fields listed above returned from the business class; along with the amount calculated from the static method.

Answer 1

Answer: Hello! Dear student, kindly find your solution here. This program is working well and error, giving the desired output. If you have any queries, feel free to ask me. Thanks.

import java.io.*;           //import packages
import java.lang.*;
import java.util.Scanner;

class Business            //create class
{
int Student_id;               //declare variables
String Student_name,email_id;
public static double Student_hours,result;       //static type variable for static method

Business()               //defalut constructor to assign defalut values
{
   Student_id = 0;
   Student_name =   "XX";
   email_id = "xxx";
   Student_hours = 0.0;
}
Business(String name,int id,String email) //parametierized contructor
{
   Student_name = name;
   Student_id = id;
   email_id = email;
}
public static void Hours(double hours)       //static method
{
Student_hours = hours;
result = Student_hours*60.50;
}
public void get()                           //getter method
{
System.out.println("Student name: "+Student_name);
System.out.println("Student ID: "+Student_id);
System.out.println("Student Email-Id: "+email_id);
System.out.println("Student Hours: "+Student_hours);
System.out.println("Result: "+result);
}
}
class Presentation //create presentation class
{
public static void main(String[]args)
{
   String na,mail;               //variable declaration
   double hrs;
   int id;
   Scanner in = new Scanner(System.in);       //call scanner for input
   System.out.   println("Enter Student Name: ");       //takes input for all fields
   na = in.nextLine();
   System.out.   println("Enter Student e-mail: ");
   mail = in.nextLine();
   System.out.   println("Enter Student ID: ");
   id = in.nextInt();
   if(id>=1000 && id<9999) //validate field
   {
   System.out.println("");
   }
   else
   {
   System.out.println("This is invalid Student ID!!"); //invalid data message
   System.out.println("Try again!");
   System.exit(0);
   }
  
   System.out.   println("Enter Student Hours: ");
   hrs = in.nextDouble();
   if(hrs>3.5 && hrs<18)               //data validate
   {
   System.out.println("");
   }
   else
   {
   System.out.println("This is invalid Student hours!!"); //invalid data message
   System.out.println("Try again!");
   System.exit(0);
   }

   Business b1 = new Business(); //call defalut constructor
   Business b2 = new Business(na,id,mail);   //call parametierized constructor
   b2.Hours(hrs);                                       //call methods
   b2.get();
}
}