Write a class encapsulating the concept of student grades on a test, assuming st

Question

Write a class encapsulating the concept of student grades on a test, assuming student grades are composed of a list of integers between 0 and 100.

Write the following methods:

- A constructor with just one parameter, the number of students; all grades can be randomly generated.
- Accessor, mutator, toString, and equals methods.
- A method returning an array of the grades sorted in ascending order.
- A method returning the highest grade.
- A method returning the average grade.
- A method returning the median grade (Hint: The median grade will be located in the middle of the sorted array of grades.)
- A method returning the mode (the grade that occurs most often). (Hint: Create an array of counters; count how many times each grade occurs; then pick the maximum in the array of counters; the array index is the mode.)

Write a client class to test all the methods in your class.

Explanation / Answer

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import java.util.Scanner;
public class TestGrades
{public static void main(String[] args)
    {Scanner in=new Scanner(System.in);
    int n;
    System.out.print("How many students are there: ");
    n=in.nextInt();
    Grades g=new Grades(n);
    g.sort();
    g.highest();
    g.calAverage();
    g.calMedian();
    g.calMode();
    System.out.println("The sorted array is: "+g.toString());
    System.out.println("Highest grade: "+g.getHigh());
    System.out.println("Average grade: "+g.getAverage());
    System.out.println("Median grade: "+g.getMedian());
    System.out.println("Mode: "+g.getMode()+" or it is multi modal, and this is the first value");
    }
    }

---------------------------------

import java.util.*;
public class Grades
{
    private int[] grade;
    private int highest,mode;
    private double average,median;
    public Grades(int n)
    {   Random r=new Random();
        grade = new int[n];
      
        for(int i = 0;i<n; i++)
           grade[i] = Math.abs(r.nextInt())%101;
        }
  
    public double getTotal()
    {
        int total = 0;
          int i;
        for(i=0;i<grade.length;i++)
               total+=grade[i];
                       
        return total;
    }
  
    public void calAverage()
    {           average= getTotal() / (double)grade.length;
    }
    public int getHigh()
    {return highest;
    }
    public double getMedian()
    {return median;
    }
    public int getMode()
    {return mode;
    }

    public double getAverage()
    {return average;
    }
        public void highest()
    {   highest = grade[grade.length-1];
                 
      
    }
    public void sort()
    {int i,j,t;
        for(i=0;i<grade.length-1;i++)
         for(j=i+1;j<grade.length;j++)
             if(grade[i]>grade[j])
                  {t=grade[i];
                    grade[i]=grade[j];
                    grade[j]=t;
            }
                   
    }   
    public void calMedian()
    {if(grade.length%2==0)
         median=(grade[grade.length/2-1]+grade[(grade.length)/2])/2.;
    else
          median=grade[grade.length/2];
    }
    public void calMode()
    {int []a=new int[101];
        int i,m;
    for(i=0;i<=grade.length;i++)
         a[i]=0;
    for(i=0;i<grade.length;i++)
          a[grade[i]]++;
        m=0;
    for(i=0;i<a.length;i++)
         if(a[i]>a[m])
              m=i;
    mode=m;
    }
public String toString()
{int i;
String s="";
for(i=0;i<grade.length;i++)
    {s=s+grade[i]+" ";
    if((i+1)%10==0)
         s=s+' ';
       
    }
return s;
}   
   
   }

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