\\ Essay Class Design an Essay class that extends the GradedActivity class prese

Question

Essay Class

Design an Essay class that extends the GradedActivity class presented in this chapter. The Essay class should determine the grade a student receives for an essay. The student's essay score cna be up to 100 and is determinded in the following manner:

Grammar: 30 points
Spelling 20 Points
Correct length: 20 points
Content: 30 points

Demonstrate the class in a simple program.

Homwork

-Create a Essay Demo class that does the following:
Create an Essay object using the default constructor.
Assign scores to the object:
grammer = 25pts, spelling = 18 pts, length = 20 pts content = 25 pts

The output should display the score details mentioned above along with the totlal points and letter grade, whereby 90-100 = A, 80 - 89 = B, 70 - 79 = C, 60 -69 = D, <60 = F

-Create a GradedActivity class with the following methods:
setScore,getScore,getGrade

-Create a derived class of GradedActivity called Essay with the following methods:

setScore - sets points for grammer, spelling, length, and content
This method also overloads the super class method.

Make the following 4 methods private:
setGrammer - sets the grammar points, validating them before they are set
setSpelling - sets the spelling points, validating them before they are set
setCorrectLength - sets the points for correct length, validating them before they are set
setContent - sets the points for content, validating them before they are set
Make the following 4 methods public:
getGrammar,getSpelling,getCorrectLength,getContent,getScore

Explanation / Answer

Dear...

import java.util.Scanner;

public class GradedActivity
{
private double score;

public void setScore(double s)
{
score = s;
}

public double getScore()
{
return score;
}
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;
}
}
public class Essay extends GradedActivity
{
private double grammar;
private double spelling;
private double correctLength;
private double content;

public void setScore(double gr, double sp, double len, double cnt)
{
setGrammar(gr);
setSpelling(sp);
setCorrectLength(len);
setContent(cnt);
super.setScore(grammar + spelling + correctLength + content);
}

private void setGrammar(double g)
{
if (g <= 30.0)
grammar = g;
else
grammar = 0.0;
}
private void setSpelling(double s)
{
if (s <= 20.0)
spelling = s;
else
spelling = 0.0;
}

private void setCorrectLength(double c)
{
if (c <= 20.0)
correctLength = c;
else
correctLength = 0.0;
}
private void setContent(double c)
{
if (c <= 30)
content = c;
else
content = 0.0;
}
public double getGrammar()
{
return grammar;
}
public double getSpelling()
{
return spelling;
}
public double getCorrectLength()
{
return correctLength;
}

public double getContent()
{
return content;
}
public double getScore()
{
return grammar + spelling + correctLength + content;
}
}

public class FinalExam extends GradedActivity

{
private int numQuestions;
private double pointsEach;
private int numMissed;

public FinalExam(int questions, int missed)
{
double numericScore;

numQuestions = questions;
numMissed = missed;

pointsEach = 100.0 / questions;
numericScore = 100.0 - (missed * pointsEach);

setScore(numericScore);
}

public double getPointsEach()
{
return pointsEach;
}

public int getNumMissed()
{
return numMissed;
}
}

public class PassFailActivity extends GradedActivity
{
private double minPassingScore;

public PassFailActivity(double mps)
{
minPassingScore = mps;
}

public char getGrade()
{
char letterGrade;

if (super.getScore() >= minPassingScore)
letterGrade = 'P';
else
letterGrade = 'F';

return letterGrade;
}
}
public class PassFailExam extends PassFailActivity
{
private int numQuestions;
private double pointsEach;
private int numMissed;

public PassFailExam(int questions, int missed, double minPassing)
{
super(minPassing);
double numericScore;
numQuestions = questions;
numMissed = missed;
pointsEach = 100.0 / questions;
numericScore = 100.0 - (missed * pointsEach);
setScore(numericScore);
}
public double getPointsEach()
{
return pointsEach;
}
public int getNumMissed()
{
return numMissed;
}
}

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