Question

please only use import java.util.Scanner

Driver's License Exam The local Driver's License Office has asked you to write a program that grades the written portion of the driver's license exam. The exam has 20 multiple choice questions. Here are the correct answers: 1. A 2. D 3.В 4. B 5, C 6. В 7. A 8.В 9, C 10. D 12. C 13. D 14. B 15. D 16. С 18. A 19. D 20. B Your program should store the correct answers shown above in an array. It should ask the user to enter the student's answers for each of the 20 questions, and the answers should be stored in another array. After the student's answers have been entered, the program should display a message indicating whether the student passed or failed the exam. (A student must correctly answer 15 of the 20 questions to pass the exam.) It should then display the total number of correctly answered questions, the total number of incorrectly answered questions, and a list showing the question numbers of the incorrectly answered questions. Input Validation: Only accept the letters A, B C or D as answers.

Answer 1

      Public class DriverExam

{

 private String[] correctAnswers  ={"B", "D", "A", "A", "C", "A", 

           "B", "A", "C", "D", 

           "B", "C", "D", "A", 

           "D", "C", "C", "B", "D", "A"}; 

       private String[] userAnswers; 
       int[] missed = new int[correctAnswers.length]; 
       public DriverExam (String[] Answers)
       {
          userAnswers = new String[Answers.length]; 

          for (int i = 0; i < Answers.length; i++)
          {
             userAnswers[i] = Answers[i]; 
          }
       }
       public boolean passed()
       {
          if (totalCorrect() >= 15)
             return true; 
          else
             return false; 
       }
       public int totalCorrect()
       {
          int correctCount = 0; 

          for (int i = 0; i < correctAnswers.length; i++)
          {
             if (userAnswers[i].equalsIgnoreCase(correctAnswers[i]))
             {
                correctCount++; 
             }
          }
          return correctCount; 
       }
       public int totalIncorrect()
       {
          int incorrectCount = 0; 

          for (int i = 0; i < correctAnswers.length; i++)
          {
             if (!userAnswers[i].equalsIgnoreCase(correctAnswers[i]))
             {
                missed[incorrectCount] = i; 
                incorrectCount++; 
             }
          }
          return incorrectCount; 
       }
       public int[] questionsMissed()
       {
          return missed; 
       }

    }
import java.util.Scanner; 

public class DriverExamApplication
{
   public static void main(String[] args)
   {
      System.out.println("    Driver's License Exam "); 
      Scanner input = new Scanner(System.in); 

      System.out.println(" 20 Multiple-Choice Questions "); 
      System.out.println("       Mark A, B, C, D   "); 
      String[] answers = new String[20]; 
      String answer; 

      for (int i = 0; i < 20; i++)
      {
         do
         {
            System.out.print((i+1) + ": "); 
            answer = input.nextLine(); 
         } while (!isValidAnswer(answer)); 

         answers[i] = answer; 
      }
      DriverExam exam = new DriverExam(answers); 
      System.out.println("  RESULTS  "); 
      System.out.println("Total Correct: " + exam.totalCorrect()); 
      System.out.println("Total Incorrect: " + exam.totalIncorrect()); 
      String passed = exam.passed() ? "YES" : "NO"; 
      System.out.println("Passed: " + passed); 

      if (exam.totalIncorrect() > 0)
      {
          System.out.println("The incorrect answers are: "); 

          int missedIndex; 

          for (int i = 0; i < exam.totalIncorrect(); i++)
          {
            missedIndex = exam.questionsMissed()[i]+1; 
            System.out.print(" " + missedIndex); 
          }
      }
   public static boolean isValidAnswer (String answer)
   {
      return "A".equalsIgnoreCase(answer) || 
         "B".equalsIgnoreCase(answer)
         || "C".equalsIgnoreCase(answer) || 
         "D".equalsIgnoreCase(answer); 
   }
}