Part 1 (class GradeExams) and Part 2 (class GradeexamsUI)

GradeExam:

public final class GradeExams

{

/**

* prevent instantiating this class

*/

private GradeExams() {}

/**

* Test driver

*

* @param args -unused-

*/

public static void main( String[] args )

{

char[] answerKey = "DBDCCDAEAD".toCharArray() ; // the correct answers

char[][] studentsAnswers = { // each student's answers

"ABACCDEEAD".toCharArray(),

"DBABCAEEAD".toCharArray(),

"EDDACBEEAD".toCharArray(),

"CBAEDCEEAD".toCharArray(),

"ABDCCDEEAD".toCharArray(),

"BBECCDEEAD".toCharArray(),

"BBACCDEEAD".toCharArray(),

"EBECCDEEAD".toCharArray(),

"EBECCDEEADX".toCharArray(),

"EBECCDEEA".toCharArray()

} ;

// descriptive introductory text

displayIntro() ;

// grade the exams: display the results on a per-student basis and summary statistics

gradeAllExams( answerKey, studentsAnswers );

}

/**

* Utility method to display identifying information and a description of what it does

*/

static void displayIntro()

{

System.out.println( "Comp 1050, Computer Science II" ) ;

}

/**

* Utility method to grade all exams and display summary statistics

*

* @param answerKey the set of correct answers

* @param allStudentsAnswers the answers for all of the students

*/

static void gradeAllExams( char[] answerKey,

char[][] allStudentsAnswers

)

{

// TODO - STUB - implement this method

}

/**

* Utility method to grade a single exam

*

* @param studentId the student's identification number

* @param answerKey the set of correct answers

* @param studentAnswers the student's answers

* @param correctAnswerCount counters for each question to track number of times answered

* correctly

* @return true indicates that we were able to grade the exam; false means the number of

* questions according to the answer key does not match the number of questions answered

* by the student - does not reflect whether the student 'passed'

*/

static boolean gradeAnExam( int studentId,

char[] answerKey,

char[] studentAnswers,

int[] correctAnswerCount

)

{

// TODO - STUB - implement this method

return false ;

}

/**

* Utility method to display the statistics for an exam

*

* @param correctAnswerCount number of correct responses per question

* @param studentCount number of students that took the exam

* @param gradedExamCount number of exams that were actually graded (

*/

static void reportStatistics( int[] correctAnswersCount,

int studentCount,

int gradedExamCount

)

{

// TODO - STUB - implement this method

}

}

GradeExamUI

import java.util.Scanner ;

public final class GradeExamsUI

{

/**

* prevent instantiating this class

*/

private GradeExamsUI() {}

/**

* Application to grade multiple-choice exams

*

* @param args -unused-

*/

public static void main( String[] args )

{

// descriptive introductory text

displayIntro() ;

// access the keyboard so user can provide the answer key and students' answers

Scanner keyboard = new Scanner( System.in ) ;

// get the answer key

char[] answerKey = getAnswerKey( keyboard ) ;

// get the students' answers

char[][] studentsAnswers = getStudentsAnswers( keyboard, answerKey ) ;

// release Scanner/keyboard resources

keyboard.close();

// grade the exams: displays the results on a per-student basis and summary statistics

GradeExams.gradeAllExams( answerKey, studentsAnswers );

}

/**

* Utility method to display identifying information and a description of what it does

*/

private static void displayIntro()

{

System.out.println( "Comp 1050, Computer Science II" ) ;

}

/**

*

* @param input

* @return the user-supplied answer key

*/

private static char[] getAnswerKey( Scanner input )

{

// TODO - STUB - replace the following, temporary data with user-supplied information.

char[] answerKey = { 'A', 'B', 'C' } ;

return answerKey ;

}

/**

*

* @param answerKey

* @return

*/

private static char[][] getStudentsAnswers( Scanner input,

char[] answerKey )

{

// TODO - STUB - replace the following, temporary data with user-supplied information.

char[][] studentsAnswers = { { 'A', 'B', 'C' },

{ 'A', 'C', 'C' },

{ 'A', 'B', 'C', 'D' },

{ 'A', 'B' }

} ;

return studentsAnswers ;

}

}

Comp 1050, Computer Science II Lab 2: Grade Exams Due: Su 2/18/2018 This lab grades multiple-choice exams given fixed (hard-coded) student answers and answer key. Information about each student's exam results are displayed, followed by a summary of the performance of all students on a per-question basis. Student Grades: The exam contains 10 questions The correct answers are DBDCCDAEAD Student 1 answered 7 correct ( 70%): -B-CCD-EAD Student 2 answered 6 correct ( 60%): DB--C--EAD Student 3 answered 5 correct ( 50%): --D-C--EAD Student 4 answered 4 correct ( 40%): -B Student 5 answered 8 correct ( 80%): -BDCCD-EAD Student 6 answered 7 correct ( 70%): -B-CCD-EAD Student 7 answered 7 correct ( 70%) : -B-CCD-EAD Student 8 answered 7 c rrect ( 70%) : -B-CCD-EAD Error: Student 9 answered 11 questions: EBECCDEEADX Error: Student 10 answered 9 questions: EBECCDEEA EAD Exam Statistics: 10 students took the exam, 8 exams were graded. Question # Times Correct ( 12%) ( 87%) ( 25%) ( 62%) ( 87%) ( 62%) ( 0%) (100%) (100%) (100%) 7 5 7 0 8 8 8 10 Comp 1050, Computer Science II Lab 2: Grade Exams Due: Su 2/18/2018 This lab grades multiple-choice exams given fixed (hard-coded) student answers and answer key. Information about each student's exam results are displayed, followed by a summary of the performance of all students on a per-question basis. Student Grades: The exam contains 10 questions The correct answers are DBDCCDAEAD Student 1 answered 7 correct ( 70%): -B-CCD-EAD Student 2 answered 6 correct ( 60%): DB--C--EAD Student 3 answered 5 correct ( 50%): --D-C--EAD Student 4 answered 4 correct ( 40%): -B Student 5 answered 8 correct ( 80%): -BDCCD-EAD Student 6 answered 7 correct ( 70%): -B-CCD-EAD Student 7 answered 7 correct ( 70%) : -B-CCD-EAD Student 8 answered 7 c rrect ( 70%) : -B-CCD-EAD Error: Student 9 answered 11 questions: EBECCDEEADX Error: Student 10 answered 9 questions: EBECCDEEA EAD Exam Statistics: 10 students took the exam, 8 exams were graded. Question # Times Correct ( 12%) ( 87%) ( 25%) ( 62%) ( 87%) ( 62%) ( 0%) (100%) (100%) (100%) 7 5 7 0 8 8 8 10