java program of create students record.There must be at least three types of classes in your design.

Question

java program of creating students' records that take input {name, roll, admission category, email, blood group, technology and domicile} and combines them into single file by removing duplicate entries (if there is any) and ensuring no data loss. Assuming the file type yourself, build appropriate classes in order to do the job.

I. Class(es) responsible for data input

II. Class(es) responsible for data output/presentation

III. Class(es) for processing data

You can have more classes if required.

Implement data input/output mechanism

Test and validate your program

Answer 1

class StudentRec

{

protected String name;

protected int roll;

protected int admissionCategory;

protected String email;

protected int bloodType;

protected int technology;

protected int domicile;

protected float gpa;

public StudentRec( String nameStr, String emailStr)

{

name = new String(nameStr);

email = new String(emailStr);

roll=1;

admissionCategory=0;

bloodType=0;

technology=1;

domicile = 0;

gpa=0.00f;

}

public String GetName() { return(name); }

public int GetRoll() { return(roll); }

public int GetAdmissionCategory() { return(admissionCategory); }

public String GetEmail() { return(email); }

public int GetBloodType() { return(bloodType); }

public int GetTechnology() { return(technology); }

public int GetDomicile() { return(domicile); }

public float GetGPA() { return(gpa); }

public void SetRoll(int roll) { this.roll=roll; }

public void SetAdmissionCategory(int admissionCategory) { this.admissionCategory = admissionCategory; }

public void SetBloodType(int bloodType) { this.bloodType = bloodType; }

public void SetDomicile(int domicile) { this.domicile = domicile; }

public void SetGPA( float gpa) { this.gpa = gpa; }

public StudentRec( StudentRec studentRec)

{

name = new String(studentRec.name);

email = new String(studentRec.email);

roll=studentRec.roll;

admissionCategory=studentRec.admissionCategory;

bloodType=studentRec.bloodType;

technology=studentRec.technology;

domicile = studentRec.domicile;

gpa = studentRec.gpa;

}

public StudentRec( String studentRecBuffCSV)

{

String tokens[] = studentRecBuffCSV.split(",");

email = tokens[0];

name = tokens[1];

roll = Integer.parseInt(tokens[2]);

admissionCategory = Integer.parseInt(tokens[3]);

bloodType = Integer.parseInt(tokens[4]);

technology = Integer.parseInt(tokens[5]);

domicile = Integer.parseInt(tokens[6]);

gpa = Float.parseFloat(tokens[7]);

}

public String SerializeToCSV()

{

return (

new String(

email + "," +

name + "," +

roll + "," +

admissionCategory + "," +

bloodType + "," +

technology + "," +

domicile + "," +

gpa

)

);

}

}

class StudentRecDB

{

public static final int MAX_STUDENT_RECS =5000;

protected StudentRec studentRecs[];

protected int count;

public StudentRecDB()

{

studentRecs = new StudentRec[MAX_STUDENT_RECS];

count=0;

}

public int GetCount() { return(count); }

public int Push(StudentRec newStudentRec)

{

int iReturn=0;

if (count < MAX_STUDENT_RECS)

{

studentRecs[count++]=new StudentRec(newStudentRec);

}

else

{

iReturn = -1;

}

return iReturn;

}

public StudentRec IndexerGetAtIndex(int iIndexPos)

{

StudentRec studentRecReturn=null;

if (iIndexPos>=0 && iIndexPos < count)

{

studentRecReturn = new StudentRec(studentRecs[iIndexPos]);

}

return(studentRecReturn);

}

}

import java.io.*;

import java.util.Scanner;

class StudentInput

{

private BufferedReader bufferedReader;

private Scanner scanner;

public StudentInput()

{

scanner = new Scanner(System.in);

bufferedReader = null;

}

public StudentRec Input()

{

StudentRec studentRec;

String email;

String name;

float gpa;

System.out.print(" Please input student email :>");

email = scanner.nextLine();

System.out.print(" Please input student name in the format last;first \n"+

" EX. Smith;John \n"+

" ----:> ");

name = scanner.nextLine();

System.out.println("Please input student GPA");

gpa = scanner.nextFloat();

studentRec = new StudentRec(name,email);

studentRec.SetGPA(gpa);

//please continue here with the input of the remaining data field columns: roll,bloodtype,etc.

return(studentRec);

}

public int Read(StudentRecDB studentRecDB, String filename)

{

int iReturn=0;

String inbuff;

try

{

FileReader fileReader = new FileReader(filename);

bufferedReader = new BufferedReader(fileReader);

inbuff = bufferedReader.readLine();

int N = Integer.parseInt(inbuff);

for (int iLoop=0; iLoop<N; iLoop++)

{

inbuff = bufferedReader.readLine(); System.out.println(inbuff);

StudentRec curStudentRec = new StudentRec(inbuff);

studentRecDB.Push(curStudentRec);

}

if (N == studentRecDB.GetCount())

{

System.out.println( N + " records read from file ");

}

bufferedReader.close();

}

catch (Exception ex)

{

System.out.println(" IO Exception occurs ");

iReturn=-1;

}

return(iReturn);

}

}

import java.io.*;

class StudentOutput

{

public int Write(StudentRecDB studentRecDB, String filename)

{

int iReturn=0;

try

{

FileWriter fileWriter = new FileWriter(filename);

BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);

int N = studentRecDB.GetCount();

String outbuff = " " + N + "\n";

bufferedWriter.write(outbuff);

for (int iLoop=0; iLoop<N; iLoop++)

{

StudentRec curStudentRec = studentRecDB.IndexerGetAtIndex(iLoop);

outbuff = curStudentRec.SerizlizeToCSV()+ "\n";

bufferedWriter.write(outbuff);

}

bufferedWriter.close();

}

catch (Exception ex)

{

System.out.println(" Exception occurs writing file");

iReturn=-1;

}

return(iReturn);

}

}