How do I implement this method with a Java interface? What I have is totally wro

Question

How do I implement this method with a Java interface? What I have is totally wrong and I am not sure how to implement it.

// Analyzable.java

public interface Analyzable {
double getAverage();
GradedActivity getHighest();
GradedActivity getLowest();
}

// CourseGrades.java

public class CourseGrades implements Analyzable {
  
public GradedActivity getHighest() {
GradedActivity highest = grades[0].getScore();
  
for (int i = 0; i < grades.length; i++) {
if (grades[i].getScore() > highest) {
highest = grades[i].getScore();
}
}
  
return highest;
}

}

// GradeActivity.java

public class GradedActivity {
private double score;
  
public void setScore(double score) {
this.score = score;
}
  
public double getScore() { return score; }
  
// Get letter grades
public char getLetterGrade(double grade) {
char letterGrade;
  
if (grade >= 90) {
letterGrade = 'A';
}
else if (grade >= 80) {
letterGrade = 'B';
}
else if (grade >= 70) {
letterGrade = 'C';
}
else if (grade >= 60) {
letterGrade = 'D';
}
else {
letterGrade = 'F';
}
  
return letterGrade;
  
}
}

Explanation / Answer

Note : The implementation of interface should be like this... I have provided an abstract view of implementing interface for your requirement... If you can provide me the full code then I can help you to get the exact code... Try it and let me know if you need any modifications...

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// Analyzable.java

public interface Analyzable {
double getAverage();
GradedActivity getHighest();
GradedActivity getLowest();
}

// CourseGrades.java

public class CourseGrades implements Analyzable {
  
double getAverage(){
double average = 0, total = 0;
for(int i = 0; i < grades.length; i++){
total += grades[i].getScore();
}
average = total / grades.length;
return average;
}

GradedActivity getHighest(){

GradedActivity highest = grades[0];

for(int i = 0; i < grades.length; i++)
{
   if(grades[i].getScore() > highest.getScore())
       highest = grades[i];
}

return highest;

}

GradedActivity getLowest(){

GradedActivity lowest = grades[0];

for(int i = 0; i < grades.length; i++)
{
   if(grades[i].getScore() > lowest.getScore())
       lowest = grades[i];
}

return lowest;

}
}

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