Description
This assignment is built on top of Assignment 6.
Add capability to handle Grade Book for different subjects (Chemistry and Computer Science).
We will assume a maximum of five assignments and up to 40 students.
Details will be provided in the classFrom Lab 6 –
You have a Printable interface – used by Student.
Steps for completing Lab 7 -1. Create a new interface for Faculty to use:
package adapter;
public interface Createable {
public void createGradeBook(String fname);
public void printGradeBook();
}2. Create a class called InstructorReport
package model;
public class InstructorReport {
private Student s[] = null;
private Statistics st = null;
public InstructorReport(Student [] s, Statistics st){
this.s = s;
this.st = st
}public void print() {
//call a method that print all student info.
//st.print();
}
}3. Add methods in Util or FileIO class (Util package) to serialize and deserialize
InstructorReport.public void writetodisk(InstructorReport a1, String fname)
{
try {
FileOutputStream p = new FileOutputStream(fname);
ObjectOutputStream p1 = new ObjectOutputStream(p);
p1.writeObject(a1);
}
catch(Exception e)
{
//exception message
}
}public InstructorReport readfromdisk(String fname)
{
InstructorReport a= null;
try {
FileInputStream p = new FileInputStream(fname);
ObjectInputStream p1 = new ObjectInputStream(p);
a = (InstructorReport)p1.readObject();
}
catch(Exception e)
{
//exception message
}
return a;
}4. Rename your Print class to CreatePrint.
package adapter;
public abstract class CreatePrint {
private Util u = new Util();
private Student arr[] = new Student[40];
private Statistics s = new Statistics();
private StudentReport arr2[] = new StudentReport[40];public void createGradeBook(String fname) {
//This method must be called first – before printGradeBook() or getStats() or printStudentScores()
//we will call existing methods to:
//a. read the file and build a student array – call readFile in Util
//b. compute statistics. – call methods in Statistics
//c. build StudentReport array [done in lab 6]
//d. serialize studentreport – upto 40 files. [done in lab 6]
//e. For instructor – write one file (serialized) with Student [] and Statistics[]
}public void printGradeBook() { }
//use debug flag for printing. if debug = true then print other no printing.public void getStats() {
//print stats from any object – read one object from disk and print stats.
}public void printstudentscores(int id) {
//use the serialized life so your life is easy.
//pl. don’t use search in studentreport array. long way. no good.
}}5. Create a class called GradeBook that extends the abstract class called CreatePrint
package adapter;
public class GradeBook extends CreatePrint implements Creatable, Printable {}//default package.
6. Testing your code
public class Driver7 {
public static void main(String [] args)
{
//Test Instructor interface
Creatable p = new GradeBook();
String fname = “c:\path to filename”;
p.createGradeBook(fname);
p.printGradeBook();
//next three lines should give a compiler error – can you say why?
//p.getStats();
//p.printstudentscores(1234);
//p.printstudentscores(9111); //invalid student id shld print a friendly
message – no such student.
//Test Student Interface
Printable s = p;
s.getStats();
s.printstudentscores(1234);
s.printstudentscores(9111); //invalid student id shld print a f
}
}Extra credit information:
1. If Lab6 submitted by March 12th midnight – you attempt any ec assignment you can earn full
points.
2. If Lab6 submitted by March 15th midnight – you attempt any ec assignment you can 50% of earned
points.EC1 – Lab 8 [25 points] – You design, develop and test.
Using Lab 7 – add capability for student (add to Printable interface) to compute and print grade.
If total score is 91 – Print A-
Pl. use the following rubric.
For Letter Grade:
Grade: A+ assigned with 97% or higher
Grade: A assigned with 93% or higher
Grade: A- assigned with 90% or higher
Grade: B+ assigned with 87% or higher
Grade: B assigned with 83% or higher
Grade: B- assigned with 80% or higher
Grade: C+ assigned with 77% or higher
Grade: C assigned with 73% or higher
Grade: D+ assigned with 70% or higher
Grade: D assigned with 63% or higher
Grade: D- assigned with 60% or higher
Grade: F assigned with 0% or higherEC2 – Lab 7 – if submitted by 3/19 midnight PST (+2 hours) – extra 10 points.EC3 – Still thinking.DEBUG flag –
//Just an example of how to implement DEBUG flag
public interface GBCons {
public final boolean DEBUG = true;
}public class Someclass implements GBCons {public void printstats() {
//let’s say u write code to deserialize a file
StudentReport r = …..;
if(r!=null)
if(DEBUG)
r.getStats.print();
