Analyzable Interface Modify the CourseGrades class you created in Programming Ch

Question

Analyzable Interface Modify the CourseGrades class you created in Programming Challenge 5 so it implements the following interface: public interface Analyzable {double getAverage(); GradedActivity getHighest(); GradedActivity getLowest();} The getAverage method should return the average of the numeric scores in the grades array. The getHighest method should return a reference to the element of the grades array that has the highest numeric score. The getLowest method should return a reference to the element of the grades array that has the lowest numeric score. Demonstrate the new methods in a complete program.

Explanation / Answer

// there are four methods in this class for performing four different tasks

//1. take input array elements .

//2. show average of the array elements.

//3. show heighest element of the array.

//4. show lowest element of the array.

//tyere is a user interface come on command line when the program will run and shows above options .

//the necessary task is the first one to fill the array first.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;

public class GradeActivity implements Analyzable{
   double arr[] = new double[5];
   int i = 0;
   void grade() throws NumberFormatException, IOException{
   BufferedReader scanner = new BufferedReader(new InputStreamReader(System.in));
  
   for(int i = 0 ; i < arr.length ; i++){
       System.out.print( i+1+" enter element: ");
       double a = Double.parseDouble(scanner.readLine());
       arr[i] = a;
   }
   i++;
   }
   @Override
   public double getAverage() {
       int count =0;
       double avg,add = 0;
       for(int i = 0 ; i < arr.length ; i++){
           count = i+1;
           add = add + arr[i];
       }
       avg = add / count;
       System.out.println(avg);
       return avg;
   }

   @Override
   public GradeActivity getHighest() {
       double high = arr[0],add = 0;
       for(int i = 0 ; i < arr.length ; i++){
           if(high <arr[i]){
               high = arr[i];
           }
       }
       System.out.println(high);
       return null;
   }

   @Override
   public GradeActivity getLowest() {
       double high = arr[0],add = 0;
       for(int i = 0 ; i < arr.length ; i++){
           if(high > arr[i]){
               high = arr[i];
           }
       }
       System.out.println(high);
       return null;
   }
   public static void main(String str[]){
       Scanner scanner = new Scanner(System.in);
      
       char ch;
       try {
           GradeActivity ga = new GradeActivity();
           do{
           System.out.println("select operation.");
           System.out.println("1 : fill array please.");
           System.out.println("2 : Average.");
           System.out.println("3 : Highest.");
           System.out.println("4 : Lowest.");
           int choice = scanner.nextInt();
           switch(choice){
           case 1 :
               ga.grade();
               break;
           case 2 :
               ga.getAverage();
               break;
           case 3:
               ga.getHighest();
               break;
           case 4 :
               ga.getLowest();
               break;
           default :System.out.println("wrong entry :");
           break;
            }
              
              
           System.out.println(" Do you want to continue (Type y or n) ");
            ch = scanner.next().charAt(0);
          
           }while(ch=='Y' || ch=='y');
          
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
   }
}

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