We are going to redesign the grading program as an object-oriented design. We wi

Question

We are going to redesign the grading program as an object-oriented design. We will start with a simple Student class. The student will have a name, an id (as a String) and a set of grades (as doubles).
The Student class should include:
  

--a constructor (which takes a name and id as strings),

  --getters and setters for the name and id,
  --addGrade method : void
            *which takes a double,
  --printGrades method : void
                *which prints the name, a colon, and the grades separated by commas,
  --getAdjustedAverage method : double
                * computes the average, dropping the lowest score

     --getLetterGrade method : char
                         *compute the letter grade based on the adjusted average and a straight scale

   --toString() method : String
   --Prints the

Explanation / Answer

Note: Now you can copu this code.

/* File: Student.java */
/* Student class */
import java.util.ArrayList;
public class Student
{
    /* The student will have a name, an id (as a String) and a set of grades (as doubles). */
    private String name;
    private String id;
    private ArrayList<Double> setOfGrades;
   
    /* a constructor (which takes a name and id as strings) */
    public Student(String sName, String sID)
    {
        name = sName;
        id = sID;
        setOfGrades = new ArrayList<Double>();       
    }
   
    /* getters and setters for the name and id */
    public String getName()
    {
        return name;
    }
   
    public String getID()
    {
        return id;
    }
   
    public void setName(String sName)
    {
        name = sName;
    }
   
    public void setID(String sID)
    {
        id = sID;
    }
   
    /* addGrade method : void
       which takes a double, */
    public void addGrade(double grade)
    {
        setOfGrades.add(grade);
    }
   
    /* printGrades method : void
       which prints the name, a colon, and the grades separated by commas */
    public void printGrades()
    {
        System.out.print(name + ": ");
       
        for(int i = 0; i < setOfGrades.size(); i++)
        {
            if(i != setOfGrades.size() - 1)
                System.out.print(setOfGrades.get(i) + ", ");
            else
                System.out.println(setOfGrades.get(i));
        }           
    }
   
    /* getAdjustedAverage method : double
        computes the average, dropping the lowest score */
    public double getAdjustedAverage()
    {
        // find the lowest score       
        double lowest = setOfGrades.get(0);
        int lowestIndex = 0;       
        for(int i = 1; i < setOfGrades.size(); i++)
        {
            if(setOfGrades.get(i) < lowest)
            {
                lowest = setOfGrades.get(i);
                lowestIndex = i;
            }
        }
       
        /* remove the lowest score */
        setOfGrades.remove(lowestIndex);
       
        /* now calculate the sum for remaining */
        double sum = 0;       
        for(int i = 0; i < setOfGrades.size(); i++)
            sum += setOfGrades.get(i);
               
        /* now calculate the adjusted average for remaining */
        double adjustedAverage = 0;
        if(setOfGrades.size() != 0)
            adjustedAverage = sum / setOfGrades.size();
       
        return adjustedAverage;
    }
   
    /* getLetterGrade method : char
          compute the letter grade based on the adjusted average and a straight scale */
    public char getLetterGrade()
    {
        double avgGrade = getAdjustedAverage();
        char charGrade;
       
        if(avgGrade >= 90)
            charGrade = 'A';
        else if(avgGrade >= 80)
            charGrade = 'B';
        else if(avgGrade >= 70)
            charGrade = 'C';
        else if(avgGrade >= 60)
            charGrade = 'D';
        else // if avgGrade < 60
            charGrade = 'F';
       
        return charGrade;
    }
   
    /* toString() method : String
       Prints the

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