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for the AP Computer Science Exam in Java Chapter 6: Annotated Solutions to Past Free-Response Questions 2016 Maria Litvin Phillips Academy, Andover 



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Be Prepared

for the

Chapter 6: Annotated Solutions

to Past Free-Response Questions 2016

Maria Litvin

Phillips Academy, Andover, Massachusetts

Gary Litvin

Skylight Publishing, Andover, Massachusetts

Skylight Publishing

Andover, Massachusetts

Eighth Edition

apstudent.collegeboard.org apcentral.collegeboard.org/courses 3 public class RandomStringChooser private ArrayList words; public RandomStringChooser(String[] wordArray) words = new ArrayList(); for (String w : wordArray) words.add(w); public String getNext() if (words.size() == 0) return "NONE"; 1 int i = (int)(Math.random() * words.size()); return words.remove(i); 2 3, 4 "NONE" remove(i)i

ArrayList

public class RandomStringChooser extends ArrayList public RandomStringChooser(String[] wordArray) for (String w : wordArray) add(w); public String getNext() if (size() == 0) return "NONE"; int i = (int)(Math.random() * size()); return remove(i); 4

ArrayList

ArrayList

public RandomLetterChooser(String str) super(getSingleLetters(str)); 1

RandomStringChooser

super 5 public LogMessage(String message) int i = message.indexOf(":"); machineId = message.substring(0, i); description = message.substring(i+1); public boolean containsWord(String keyword) return (" " + description + " ").indexOf(" " + keyword + " ") >= 0; 1 public boolean containsWord(String keyword) int len = keyword.length();

String d = description;

while (true) int i = d.indexOf(keyword); if (i < 0) return false; if ((i == 0 || d.substring(i-1, i).equals(" ")) && (i == d.length() - len || d.substring(i + len, i + len + 1).equals(" "))) return true; /* Or, outside of the AP subset: if ((i == 0 || d.charAt(i-1) == ' ') && (i == d.length() - len || d.charAt(i + len) == ' ')) return true; */ d = d.substring(i + len); 6 public List removeMessages(String keyword) List removed = new ArrayList(); int i = 0; while(i < messageList.size())

LogMessage msg = messageList.get(i);

if (msg.containsWord(keyword)) removed.add(msg); messageList.remove(i); else i++; return removed; 1 messageList 7 private boolean toBeLabeled(int r, int c, boolean[][] blackSquares) return !blackSquares[r][c] && (r == 0 || blackSquares[r-1][c] || c == 0 || blackSquares[r][c-1]); public Crossword(boolean[][] blackSquares) int rows = blackSquares.length; int cols = blackSquares[0].length; puzzle = new Square[rows][cols]; int num = 1; for (int r = 0; r < rows; r++) for (int c = 0; c < cols; c++) if (toBeLabeled(r, c, blackSquares)) 1 puzzle[r][c] = new Square(false, num); num++; else puzzle[r][c] = new Square(blackSquares[r][c], 0); toBeLabeledCrosswordSquare toBeLabeledCrossword

Square

8 public static int totalLetters(List wordList) int count = 0; for (String word : wordList) count += word.length(); return count; public static int basicGapWidth(List wordList, int formattedLen) return (formattedLen - totalLetters(wordList)) / (wordList.size() - 1); 1 9 public static String format(List wordList, int formattedLen) int gapWidth = basicGapWidth(wordList, formattedLen); 1

String gap = "";

for (int count = 0; count < gapWidth; count++) gap += " "; int extraSpaces = leftoverSpaces(wordList, formattedLen);

String formattedStr = "";

for (int i = 0; i < wordList.size() - 1; i++) formattedStr += wordList.get(i) + gap; if (extraSpaces > 0) 2 formattedStr += " "; extraSpaces--; formattedStr += wordList.get(wordList.size() - 1); 3 return formattedStr;

String formattedStr = wordList.get(0);

for (int i = 1; i < wordList.size(); i++) if (extraSpaces > 0) formattedStr += " "; extraSpaces--; formattedStr += gap + wordList.get(i);quotesdbs_dbs17.pdfusesText_23