Question

IN JAVA (ECLIPSE)

Design a TestScores class that has fields to hold three test scores. (If you have already written the TestScores class for programming challenge 8 of chapter 3, you can modify it.) the class constructor should accept three test scores as arguments and assign these arguments to the test score fields. The class should also have accessor methods for the test score fields, a method that returns the average of the test scores, and a method that returns the letter grade the is assigned for the test score average. Use the grading scheme in the following table:  

Test Score Average:	Letter Grade:
90-100	A
80-89	B
70-79	C
60-69	D
below 60	F

*Extra Needs: *

Use JOptionPane for I/O. Use constants where appropriate.

You should have a TestScores.java and a testing class that houses your main. *

Answer 1

import java.util.Scanner;

import javax.swing.JOptionPane;

class TestScores{
   private int score1;
   private int score2;
   private int score3;
   private static final String GRADE_A="A";
   private static final String GRADE_B="B";
   private static final String GRADE_C="C";
   private static final String GRADE_D="D";
   private static final String GRADE_F="F";
  
   public TestScores(int aScore1, int aScore2, int aScore3) {
       super();
       score1 = aScore1;
       score2 = aScore2;
       score3 = aScore3;
   }
   public int getScore1() {
       return score1;
   }
   public void setScore1(int aScore1) {
       score1 = aScore1;
   }
   public int getScore2() {
       return score2;
   }
   public void setScore2(int aScore2) {
       score2 = aScore2;
   }
   public int getScore3() {
       return score3;
   }
   public void setScore3(int aScore3) {
       score3 = aScore3;
   }
   // function calculates average of scores
   public double average(){
       return (getScore1()+getScore2()+getScore3())/3.0;
   }
   public String grade(){
       double avg=average();
       if(avg>=90)
           return GRADE_A;
       if(avg>=80)
           return GRADE_B;
       if(avg>=70)
           return GRADE_C;
       if(avg>=60)
           return GRADE_D;
       return GRADE_F;
   }
}
public class TestScoresDriver {
public static void main(String[] args) {
   // creating instance
   Scanner sc = new Scanner(System.in);
   System.out.println("Enter 3 scores: ");
   int s1=Integer.parseInt(JOptionPane.showInputDialog("Enter score1"));
   int s2=Integer.parseInt(JOptionPane.showInputDialog("Enter score2"));
   int s3=Integer.parseInt(JOptionPane.showInputDialog("Enter score3"));
   TestScores t1 = new TestScores(s1,s2,s3);
   System.out.println("Average : "+t1.average());
   System.out.println("Grade: "+t1.grade());
  
}
}

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