Design an Essay class that extends the GradedActivity class presented in this ch

Question

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 be up tp 100 and is determined in the following manner:
Grammer: 30 points
Spelling: 20 points
Correct length: 20 points
Content: 30 points

- Create a EssayDemo class that does the following:
Create an Essay object using the default constuctor. Assign scores to the object : Grammer: 30 points
Spelling: 20 points
Correct length: 20 points
Content: 30 points
(The output should display the score details mentioned above along with total 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: set Score- sets points for grammer, spelling, length, and content(This method overloads the super class method)
Make the following 4 methods private:
setGrammer- sets the grammer points.
setSpelling - sets the spelling points
setCorrectLength- sets the points for correct length
setContent- sets the points for content
Make the following 4 methods public:
getGrammer, getSpelling, getCorrectLength, getContent, getScore

Explanation / Answer

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

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