Be Prepared for the AP Computer Science Exam in Java
                    4th Edition                   
====================================================

                      Errata

p. 5

       MC_coeff * (countCorrect - 0.25*countWrong) + ...

       ... For multiple choice questions, one point is given for each correct
       answer and 1/4 point is subtracted for each wrong answer.

    Note:

       New MC questions grading policy: starting May 2011, 
       points are no longer deducted for incorrect answers
       to MC questions.  From the Fall 2010 Course Description:

         "Multiple-choice scores are based on the number of questions answered correctly.
         Points are not deducted for incorrect answers, and no points are awarded for
         unanswered questions.  Because points are not deducted for incorrect answers,
         students are encouraged to answer all multiple-choice questions.  On any questions
         students do not know the answer to, students should eliminate as many choices as
         they can, and then select the best answer among the remaining choices."

p. 11

       public int find(int[] a, int target)

    should be:

       public int countMins(int[] a)

p. 21, Question 6

        if (1000 / m) % 2 == 0)

    should be:

        if ((1000 / m) % 2 == 0)

p. 30, Question 10 answer

        it calls its substring

    should be:

        it calls its substring method

p. 31, Question 11

        String rhyme2 = process(rhyme, "\n")

    should be:

        String rhyme2 = process(rhyme, "\n");

p. 49, Section 3.2, first paragraph

        called class or static variable

    should be:

        called a class or static variable

p. 50, Second block of code

        totalNationalEnrollmentByGrade = new int[highestGrade + 1];

    should be:

        totalNationalEnrollmentByGrade = new int[HIGHEST_GRADE + 1];

p. 51

        public int getNationalEnrollment(int grade)

    should be:

        public static int getNationalEnrollment(int grade)

p. 57, first paragraph

        if point coordinates are

    should be:

        if point's coordinates are

p. 57

        public Point rotate90 (Point point)
        {
          return new Point(point.getX(), -point.getY());
        }

    should be:

        public Point rotate90 (Point point)
        {
          return new Point(-point.getY(), point.getX());
        }

p. 82, Question 29

        Person(String nm) { name = nm; }

    should be:

        public Person(String nm) { name = nm; }

p. 97, bottom of the first paragraph

        the largest sum of two different elements

    should be:

        the largest sum of any two elements

p. 147, Question 16 (D)

        for (c = 0; c < m.length; c++)

    should be:

        for (int c = 0; c < m.length; c++)

p. 155, Question 30

        j = 0;

    should be:

        int j = 0;

p. 171, Question 1

        (E)  None of the above

    should be:

        (E)  None of them

p. 180, Question 22 (and note 22 on p. 274)

    The answer choices should be (A) I Only (B) II only (C) I and II only
    (D) II and III only (E) All three, with the correct answer D.  Option III is
    acceptable because it is legal to access a given object's instance variable 
    in a static method (such as q.answer in flip); it is not legal to access "this"
    object's instance variable in a static method, because "this" is undefined.

pp. 194-196

        */ is missing in the method comments


p. 210, Question 19

        amps[i][j] < 1.0

    should be:

        amps[j][k] < 1.0

p. 231, Question 1

    The answer choices should be:

    (A)  2 1 0 -1 2
    (B)  2 1 0 -1 3
    (C)  2 1 0 0 2
    (D)  2 1 0 0 3
    (E)  2 1 1 0 3

p. 240, Question 18

        will Mergesort’s merge method will be called

    should be:

        will Mergesort’s merge method be called

p. 248, Question 34, III

        { score = 0; bestScore = 0; }

    should be:

        { player = name; }

p. 255, Question 1 (b)

        Student getStudent(i)

    should be:

        Student getStudent(int i)

p. 258, comment for calculatePostage

        $4.05 for under one pound

    should be:

        $5.15 for one pound or under 

p. 264, first paragraph

        an List<String>

    should be:

        a List<String>

p. 266, #22

        then second element

    should be:

        then the second element

p. 266, #28

        if (a instanceof Flower)

    should be:

        if (a instanceof Flower &&
           !a.getLocation().getAdjacentLocation(getDirection()).equals(getLocation()))

p. 267-268, Solution Exam 1 FR #1

        messageLists should be messageQueues

p. 273, #13

        ["ban", "an", "an"]

    should be:

        ["ban", "an", "a"]

p. 275, Solution 1 (b)

        public int getAwardLevel()
        {
          int len = getExams().size();
          int exams = 0;
          int award;
     
          for (APExam exam : getExams())
          {
            if (exam.getGrade() >= 3)
              exams++;
          }
 
          if (exams >= 4 && getAverageGrade() >= 3.25)
            award = 2;
          else if (years >= 3)
            award = 1;
          else
            award = 0;
 
          return award;
        }

    should be:

        public int getAwardLevel()
        {
          int count = 0, award;
     
          for (APExam exam : getExams())
            if (exam.getGrade() >= 3)
              count++;
 
          if (count >= 4 && getAverageGrade() >= 3.25)
            award = 2;
          else if (count >= 3)
            award = 1;
          else
            award = 0;
 
          return award;
        }

p. 277, Part (c)

        throw new IllegalArgumentException();

    should be:

        return "Error";

p. 278, Part (b):

        It is better to add a statement

          age = 0;

        to both constructors.

p. 284, #21

        Names

    should be:

        names (in code font)

p. 292, #27

        Both times SuperBug’s turn is called

    should be:

        Both times SpinningBug’s turn is called

p. 300, GridWorld entry

        unbounded grid should not be in the index