Java Program To Calculate Internal Marks of Student Using Objects And Classes

/*
 * To change this license header, choose License Headers in Project Properties.  
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package payroll;
//classes and objects  - Accessing instance variables and methods of an object using reference.

import java.lang.*;
import java.io.*;
import java.util.*;

class StudentRec
{
int regNo, test1Marks, test2Marks, quizMarks, assMarks, homeAssgnMarks, attPer =0;
int attMarks = 0;
double weightedAverageTestMarks, totalMarks;

double computeInternalMarks()
{
if (test1Marks>test2Marks)
weightedAverageTestMarks = (0.75*test1Marks)+(0.25*test2Marks);
else
weightedAverageTestMarks = (0.25*test1Marks)+(0.75*test2Marks);
totalMarks = weightedAverageTestMarks+quizMarks+homeAssgnMarks+assMarks+attMarks;
return totalMarks;
}
}


public class StudentRecDemo
{
   public static void main(String args[])   throws IOException
{
int num;
double internalMarks;
StudentRec  record = new StudentRec(); // create an object
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("enter student id ");
num = Integer.parseInt(br.readLine());
record.regNo = num;

while(true)
{
System.out.print("Enter test1 marks (0-20) : ");
num = Integer.parseInt(br.readLine());
if(num>=0 && num<=20)
{
         record.test1Marks=num;
break;
}
if(num>20) System.out.println("Invalid Test 1 Marks: Marks are too high");
if(num<0) System.out.println("Invalid Test 1 Marks: -ve Marks can not be asccepted");
System.out.println("Please enter correct Values");
}
while(true)
{
System.out.print("Enter test2 marks (0-20) : ");
num = Integer.parseInt(br.readLine());
if(num>=0 && num<=20)
{
         record.test2Marks=num;
break;
}
if(num>20) System.out.println("Invalid Test 2 Marks: Marks are too high");
if(num<0) System.out.println("Invalid Test 2 Marks: -ve Marks can not be asccepted");
System.out.println("Please enter correct Values");
}
while(true)
{
System.out.print("Enter quiz marks (0-5) : ");
num = Integer.parseInt(br.readLine());
if(num>=0 && num<=5)
{
         record.quizMarks=num;
break;
}
if(num>5) System.out.println("Invalid quiz Marks: Marks are too high");
if(num<0) System.out.println("Invalid quiz Marks: -ve Marks can not be asccepted");
System.out.println("Please enter correct Values");
}
while(true)
{
System.out.print("Enter ass marks (0-5) : ");
num = Integer.parseInt(br.readLine());
if(num>=0 && num<=5)
{
         record.assMarks=num;
break;
}
if(num>5) System.out.println("Invalid ass Marks: Marks are too high");
if(num<0) System.out.println("Invalid ass Marks: -ve Marks can not be asccepted");
System.out.println("Please enter correct Values");
}
while(true)
{
System.out.print("Enter homeAssgnMarks (0-5) : ");
num = Integer.parseInt(br.readLine());
if(num>=0 && num<=5)
{
         record.homeAssgnMarks=num;
break;
}
if(num>5) System.out.println("Invalid homeAssgnMarks: Marks are too high");
if(num<0) System.out.println("Invalid homeAssgnMarks: -ve Marks can not be asccepted");
System.out.println("Please enter correct Values");
}
while(true)
{
System.out.println("enter Attendance Percentage (0-100)");
num= Integer.parseInt(br.readLine());
if(attper>=0 && attper<=100)
{
         record.attper=num;
break;
}
if(num>100) System.out.println("Invalid attper: percentage are too high");
if(num<0) System.out.println("Invalid attper: -ve  percentage can not be asccepted");
System.out.println("Please enter correct Values");
}

if (num >= 95)
record.attMarks = 5;
else if (num >= 90)
       record.attMarks = 4;
else if (num >=85)
record.attMarks = 3;
else if (num >= 80)
record.attMarks = 2;
else if (num >= 75)
record.attMarks = 1;
else if (num <75 && num>=65)
{
record.attMarks = 0;
System.out.println(" Student is eligible for Exam by paying  Condonation Fee and producing Medical Certificate");
}
else
{
record.attMarks = 0;
System.out.println("Student is detained");
}
record.attPer = num;

internalMarks = record.computeInternalMarks();
System.out.println(" The Internal Marks of the Student = " +internalMarks);
}
}