Question

You are required to create an application to store list of students and list of lecturers. Following information are to be stored for each student:

- stdId: The student ID

- stdName: Student name

- stdDoB: Student date of birth

- stdEmail: Student email

- stdAddress: Student address

- stdBatch: The batch (class) of the student

Following information are to be stored for each lecturer:

- lecId: Lecturer ID with 8 digits (fixed)

- lecName: Lecturer

- lecDoB: Lecturer date of birth

- lecEmail: Lecturer email

- lecAddress: Lecturer address

- lecDept: Lecturer department (e.g., Computing, Business, etc)

Answer 1

import java.util.Scanner;

// Defines a class to store student information

class OurStudent

{

// Instance variables to student information

String stdId;

String stdName;

String stdDoB;

String stdEmail;

String stdAddress;

String stdBatch;

// Default constructor to assign default values to

// instance variables

OurStudent()

{

stdId = stdName = stdDoB = stdEmail = stdAddress = stdBatch = "";

}// End of default constructor

// Method to accept student data

void accept()

{

// Scanner class object created

Scanner sc = new Scanner(System.in);

// Accepts student data

System.out.print("\n Enter Student information \n");

System.out.print("\n Enter ID: ");

stdId = sc.next();

System.out.print("\n Enter Name: ");

stdName = sc.next();

System.out.print("\n Enter DOB(d/m/y): ");

stdDoB = sc.next();

System.out.print("\n Enter Email: ");

stdEmail = sc.next();

// To skip newline character

sc.nextLine();

System.out.print("\n Enter Address: ");

stdAddress = sc.nextLine();

System.out.print("\n Enter Batch: ");

stdBatch = sc.next();

}// End of method

// Overrides toString() method to display

// student information

public String toString()

{

// Concatenates data and returns it

return "\n\n ID: " + stdId + "\n Name: " + stdName +

"\n DOB: " + stdDoB + "\n Email: " + stdEmail +

"\n Address: " + stdAddress +

"\n Batch: " + stdBatch;

}// End of method

}// End of class Student

// Defines a class to store lecturer information

class Lecturer

{

// Instance variables to lecturer information

String lecId;

String lecName;

String lecDoB;

String lecEmail;

String lecAddress;

String lecDept;

// Default constructor to assign default values to

// instance variables

Lecturer()

{

lecId = lecName = lecDoB = lecEmail = lecAddress = lecDept = "";

}// End of default constructor

// Method to accept lecturer data

void accept()

{

// Scanner class object created

Scanner sc = new Scanner(System.in);

System.out.print("\n Enter Lecturer information \n");

// Loops till id is not equals to 8 digits

do

{

// Accepts a id

System.out.print("\n Enter ID(8 digit): ");

lecId = sc.next();

// Checks if number of digits is greater than 8

// Displays error message

if(lecId.length() > 8)

System.out.print("\n Exceeds 8 digit. Try again!");

// Otherwise checks if number of digits is less than 8

// Displays error message

else if(lecId.length() < 8)

System.out.print("\n Below 8 digit. Try again!");

// Otherwise valid id come out of the loop

else

break;

}while(true);// End of do - while loop

// Accepts other data

System.out.print("\n Enter Name: ");

lecName = sc.next();

System.out.print("\n Enter DOB(d/m/y): ");

lecDoB = sc.next();

System.out.print("\n Enter Email: ");

lecEmail = sc.next();

sc.nextLine();

System.out.print("\n Enter Address: ");

lecAddress = sc.nextLine();

System.out.print("\n Enter Department: ");

lecDept = sc.next();

}// End of method

// Overrides toString() method to display

// lecturer information

public String toString()

{

// Concatenates data and returns it

return "\n\n ID: " + lecId + "\n Name: " + lecName +

"\n DOB: " + lecDoB + "\n Email: " + lecEmail +

"\n Address: " + lecAddress +

"\n Department: " + lecDept;

}// End of method

}// End of class Lecturer

// Driver class StudentLecturer definition

public class StudentLecturer

{

// main method definition

public static void main(String ss[])

{

// Scanner class object created

Scanner sc = new Scanner(System.in);

// Accept number of students

System.out.print("\n Enter number of Students information " +

"you want to add: ");

int no = sc.nextInt();

// Creates an array of objects of size no for students

OurStudent st[] = new OurStudent[no];

// Loops no times to accept student data

for(int c = 0; c < no; c++)

{

// Creates current object

st[c] = new OurStudent();

// Accept data for current object

st[c].accept();

}// End of for loop

System.out.print("\n *************** Student Information *************** ");

// Loops no number of times to displays student information

for(int c = 0; c < no; c++)

System.out.print(st[c]);

// Accept number of lecturers

System.out.print("\n Enter number of Lecturer information " +

"you want to add: ");

no = sc.nextInt();

// Creates an array of objects of size no for lecturer

Lecturer le[] = new Lecturer[no];

// Loops no times to accept student data

for(int c = 0; c < no; c++)

{

// Creates current object

le[c] = new Lecturer();

// Accept data for current object

le[c].accept();

}// End of for loop

System.out.print("\n *************** Lecturer Information *************** ");

// Loops no number of times to displays lecturer information

for(int c = 0; c < no; c++)

System.out.print(le[c]);

}// End of main method

}// End of class

Sample Output:

Enter number of Students information you want to add: 2

Enter Student information

Enter ID: 122231

Enter Name: Mohan

Enter DOB(d/m/y): 12/3/2004

Enter Email:
mohan@abc.com

Enter Address: Berhampur

Enter Batch: MCA

Enter Student information

Enter ID: 325689

Enter Name: Ram

Enter DOB(d/m/y): 5/2/2001

Enter Email: ram@abc.com

Enter Address: Cuttack, orissa.

Enter Batch: B.Tech

*************** Lecturer Information ***************  

ID: 122231
Name: Mohan
DOB: 12/3/2004
Email: mohan@abc.com
Address: Berhampur
Batch: MCA

ID: 325689
Name: Ram
DOB: 5/2/2001
Email: ram@abc.com
Address: Cuttack, orissa.
Batch: B.Tech
Enter number of Lecturer information you want to add: 1

Enter Lecturer information

Enter ID(8 digit): 122356

Below 8 digit. Try again!
Enter ID(8 digit): 1223568798

Exceeds 8 digit. Try again!
Enter ID(8 digit): 12236784

Enter Name: Suresh

Enter DOB(d/m/y): 12/3/2001

Enter Email: Suresh@abc.com

Enter Address: Banga, Bihar

Enter Department: Manager

*************** Student Information ***************  

ID: 12236784
Name: Suresh
DOB: 12/3/2001
Email: Suresh@abc.com
Address: Banga, Bihar
Department: Manager