I have this assignment I gotta do. It looks good, except for the getHighest output and the getLowest result. Here's my code:
KNW_CourseGradesV2 Class:
public class KNW_CourseGradesV2 implements KNW_Analyzable
{
//Declare array variable
private KNW_GradedActivity[] grades = new KNW_GradedActivity[4];
String results;
/**
* Constructor
* */
public KNW_CourseGradesV2()
{
}
public void setLab(KNW_GradedActivity lab)
{
grades[0] = lab;
}
public void setPassFailExam(KNW_GradedActivity pfe)
{
grades[1] = pfe;
}
public void setEssay(KNW_GradedActivity essay)
{
grades[2] = essay;
}
public void setFinalExam(KNW_FinalExam fe)
{
grades[3] = fe;
}
public void setTotalGrade(KNW_GradedActivity tg)
{
grades[4] = tg;
}
public String toString()
{
//Lay out all of the scores
return "Lab Score: " + grades[0].getScore() +
"\tGrade: " + grades[0].getGrade() +
"\nPass/Fail Exam: " + grades[1].getScore() +
"\tGrade: " + grades[1].getGrade() +
"\nEssay Score: " + grades[2].getScore() +
"\tGrade: " + grades[2].getGrade() +
"\nFinal Exam Score: " + grades[3].getScore() +
"\tGrade: " + grades[3].getGrade();
}
//Find the average of the grades
public double getAverage()
{
double sum = 0.0;
double average = 0.0;
double total = 0.0;
//For loop to calc. the average
for(int i =0; i<grades.length; i++)
{
total =+ grades[i].getScore();
average = sum/grades.length;
}
return average;
}
public KNW_GradedActivity getHighest()
{
double highest = grades[0].getScore();
for(int i = 0; i < grades.length; i++)
{
if(grades[i].getScore() > highest)
{
highest = grades[i].getScore();
}
}
//Created KNW_GradedActivity object to bring the highest number
//into the setScore method so it can be a double
KNW_GradedActivity gaH = new KNW_GradedActivity();
gaH.setScore(highest);
return gaH;
}
public KNW_GradedActivity getLowest()
{
double lowest = grades[0].getScore();
for(int i = 0; i < grades.length; i++)
{
if(grades[i].getScore() > lowest)
{
lowest = grades[i].getScore();
}
}
//Samething here, just doing it for the lowest number
KNW_GradedActivity gaL = new KNW_GradedActivity();
gaL.setScore(lowest);
return gaL;
}
}
KNW_Analyzable Class:
public interface KNW_Analyzable
{
double getAverage();
KNW_GradedActivity getHighest();
KNW_GradedActivity getLowest();
}
KNW_GradedActivity Class:
public class KNW_GradedActivity
{
private double score; // Numeric score
/**
The setScore method sets the score field.
@param s The value to store in score.
*/
public void setScore(double s)
{
score = s;
}
/**
The getScore method returns the score.
@return The value stored in the score field.
*/
public double getScore()
{
return score;
}
/**
The getGrade method returns a letter grade
determined from the score field.
@return The letter grade.
*/
public char getGrade()
{
char letterGrade;
if (score >= 90)
letterGrade = 'A';
else if (score >= 80)
letterGrade = 'B';
else if (score >= 70)
letterGrade = 'C';
else if (score >= 60)
letterGrade = 'D';
else
letterGrade = 'F';
return letterGrade;
}
}
And here is the output I get. I will just show the problem I am facing, won't show all of the output.
Output:
Average: 0.0
Highest: KNW_GradedActivity@565d3fa7
Lowest: KNW_GradedActivity@655c4395>
I have been trying for about a week to figure this out and find what is happening, and I can't seem to find it.
Notice that in the return of your methods, you are actually returning gaH
and gaL
, both of which are KNW_GradedActivity Objects. If you want to see the score, you should probably return gaH.getScore()
and gaL.getScore()
.
Why not to use Stream
and DoubleSummaryStatistics
to get the stats? Let the api do all the calculations:
List<KNW_GradedActivity> grades = Arrays.asList(new KNW_GradedActivity(), new KNW_GradedActivity(), new KNW_GradedActivity());
grades.get(0).setScore(91);
grades.get(1).setScore(81);
grades.get(2).setScore(71);
DoubleSummaryStatistics statistics = grades.stream().
collect(Collectors.summarizingDouble(KNW_GradedActivity::getScore));
System.out.println(statistics);
// DoubleSummaryStatistics{count=3, sum=243.000000, min=71.000000, average=81.000000, max=91.000000}
Another alternative is to override toString method in your KNW_GradedActivity
class:
@Override
public String toString() {
return "{" +
"score=" + score +
", grade='" + getGrade() + '\'' +
'}';
}
This way you dont have to change your actual print statement and will have a nice output combining your score and grade. It will look like:
{score=90.0, grade='A'}
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