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6. (15 points) Define class GradeStat to describe the grades of all people in a group. (1) Declare data member grades as an array of integers (we can declare it as a double type, but use int type can be simpler). (2) Write a constructor taking an array of int as input parameter. Use it to initialize data member. Note that each element in the array should be a non- negative int not larger than 100, that is, an int in [0, 100); if not, initialize data member to be an array with values 80, 70, 90, 98, 60. (3) Write a method to get the value of data member. (4) Write a method to take a given parameter to reset data member. Note that each element in the given array should be in (0, 100) before the given parameter array can be used to change data member array. (5) Override toString method. (6) Override equals method. (7) Write a method to return the average grade of this group. Note that the average grade may contain decimal numbers. (8) Write a method to return the difference between the highest and the lowest grade in this group (warning: not biggest difference between two adjacent elements). Write a client to test the above class. (1) Default an array with values [80, 70, 90, 98, 60) and use it as input parameter to create an object of GradeStat. (2) Test setter. (3) Test getter. (4) Test toString. (5) Test equals method. (6) Call method to get average grade and print the return. (7) Call method to get the biggest difference between any two elements in the group.

Answer 1

Answer: Hey dear student finds the solution of your query if you have any doubt feel free to ask. Thanks!!

This java class has all methods those you mentioned in problem getters and setters,constructor,calculate average and difference methods and overriding toString() and equals() and all methods calls in Main class and gives output. If any issue comment me in comment box. thanks.

Java Code:

import java.util.*;

class GradeStat//class GradeStat
{
//private datamembers
int [] grades;
double avg;
int diff;
public GradeStat(int[] arr)//constructor that takes input paratmeter and initialize array
{
this.grades=arr;
}
public void get()//getter method
{
for(int i=0;i<5;i++)
{
System.out.println(grades[i]);
}
}
public void set(int[] arr)//setter method
{
for(int i=0;i<grades.length;i++)
{
if(arr[i]>0&&arr[i]<100)
{
grades[i] = arr[i];
}
}
}
public double calcAvg()//to calculate average
{
double sum =0;
for(int i=0;i<grades.length;i++)
{
sum += grades[i];
}
avg = sum/5;
return avg;
}
//method to calculate difference
public int difference()
{
//first find max and min
int max = grades[0];
int min = grades[0];

for(int i=1;i<grades.length;i++)
{
if(grades[i]>max)
{
max =grades[i];
}
else
if(grades[i]<min)
{
min = grades[i];
}
}
diff = max-min;//calculate difference
return diff;
}
//overridibg toString()
public String toString()
{
return String.format("Average of Grades:"+avg+"\nDifference between max and min: "+diff);
}
//overriding equals() method of object class
public boolean equals(Object ob)
{

//if same objects return true otherwise false
if(ob==this)
{
return true;
}
if(!(ob instanceof GradeStat))
{
return false;
}
GradeStat g = (GradeStat) ob;
return Double.compare(avg,g.avg)==0;
}
}
class Main//main class to test above class
{
public static void main(String[]args)
{
int arr[]={80,70,90,98,60}; //array
boolean ans;
GradeStat gd = new GradeStat(arr);//create object of class passing array as input parameter
GradeStat gd1 = new GradeStat(arr); //create another object to comparison
gd.set(arr); //call setter
gd.get(); //call getter
gd.calcAvg(); //call calcAvg()
gd.difference(); //call difference()
ans = gd.equals(gd1); //call equals()
System.out.println(gd); //print gd object
System.out.println(ans); //prin comprison result
}
}

Average of Grades:79.6 Difference: 38 false