Added some Javadocs

src/DriverExam.java

@@ -5,26 +5,39 @@ import java.util.ArrayList;
  * and handles logic for calculating if the user passed, and displays incorrect answers
  */
 public class DriverExam {
-    /** Array of correct exam answers. IStatic because it does not change or depends on which
-      * user is taking the exam
-     **/
+    /** Array of correct exam answers. Is Static because it does not change or depends on which user is taking
+     * the exam **/
     private final static char[] correctAnswers =
             {'B','D','A','A','C','A','B','A','C','D','B','C','D','A','D','C','C','B','D','A'};
 
-    /** Array of user's answers **/
+    /** Array of the user's answers **/
     private final char[] givenAnswers;
+
     /** Count of correct user answers **/
     private int totalCorrect;
+
     /** Corresponds to each question, each true if correct answer **/
     private boolean[] missedQuestions;
 
+    // Constructors
+    public DriverExam(char[] givenAnswers) {
+        this.givenAnswers = givenAnswers;
+        // Initialize missedQuestions to length 20. By default, they will all be False
+        missedQuestions = new boolean[20];
+    }
+
+
     /**
      * Compares givenAnswers to correctAnswers, counting amount correct
      * Also updates missedQuestions with incorrect answers
+     * 15 out of 20 is required to pass
      * @return If user passed exam
      */
     public boolean passed() {
+        // Count correct answers
         int correct = 0;
+        // Loop through and compare givenAnswers to Correct Answer
+        // Updating correct count, or missedQuestions when needed
         for(int i = 0; i < givenAnswers.length; i++) {
             if(givenAnswers[i] == correctAnswers[i]) {
                 correct++;
@@ -33,22 +46,34 @@ public class DriverExam {
                 missedQuestions[i] = true;
             }
         }
+        // Update member
         totalCorrect = correct;
         return correct >= 15;
     }
 
-    public DriverExam(char[] givenAnswers) {
-        this.givenAnswers = givenAnswers;
-        missedQuestions = new boolean[20];
-    }
+
     // Getter methods
+
+    /**
+     * Returns count of correct answers
+     * @return Count of correct answers
+     */
     public int totalCorrect() {
         return totalCorrect;
     }
+
+    /**
+     * Returns count of incorrect answers, by subtracting correct from 20
+     * @return Count of incorrect answers
+     */
     public int totalIncorrect() {
         return 20 - totalCorrect;
     }
 
+    /**
+     * Appends the question number of the missed questions to an arraylist so we can have a list of the incorrect
+     * @return Arraylist with the numbers of the incorrectly answered questions
+     */
     public ArrayList<Integer> questionsMissed() {
         ArrayList<Integer> missedNums = new ArrayList<>();
         for(int i = 0; i < missedQuestions.length; i++) {

src/Main.java

@@ -5,15 +5,17 @@ public class Main {
     public static void main(String[] args) {
         //char[] answers = {'A','B','F','F','F','F','F','A','C','D','B','C','D','A','D','C','C','B','D','A'};
         char[] answers = new char[20];
+
+
         /// ////////
         int i = 0;
         String checkString = "ABCD";
         Scanner scanner = new Scanner(System.in);
         do {
             System.out.print("Question " + (i+1) + " Student Answer: ");
-            String userIn = scanner.nextLine();
+            String userIn = scanner.nextLine().toUpperCase();
 
-            if(userIn.length() > 1){
+            if(userIn.length() != 1){
                 System.out.println("Please input only a single letter A,B,C,or D");
                 continue;
             }