// A method that takes an ArrayList<String> as argument and // - PDF document

// A method that takes an ArrayList<String> as argument and // returns true if the first String has length 5 // false otherwise // If list is null or the ArrayList is empty, return false public boolean FirstStringOfLength5(ArrayList<String> list) { if (list == null || list.size() == 0) { return false; } String firstString = list.get(0); return firstString != null && firstString.length() == 5; } // A method that takes an ArrayList<String> as argument and // returns true if contains is a String of length 5 // false otherwise // If list is null or the ArrayList is empty, return false public boolean HasStringOfLength5(ArrayList<String> list) { if (list == null || list.size() == 0) { return false; } for (String s : list) { if (s != null && s.length() == 5) { return true; } } return false; }

// A method that takes an ArrayList<String> as argument and // returns the number of Strings of length 5 it contains // // If list is null or the ArrayList is empty, return 0 // // USE AN ENHANCED FOR LOOP public int HowManyStringsOfLength5_v1(ArrayList<String> list) { if (list == null || list.size() == 0) { return 0; } int total = 0; for (String s : list) { if (s != null && s.length() == 5) { total = total + 1; } } return total; }

// A method that takes an ArrayList<String> as argument and // returns the number of Strings of length 5 it contains // // If list is null or the ArrayList is empty, return 0 // // USE A (REGULAR) FOR LOOP public int HowManyStringsOfLength5_v2(ArrayList<String> list) { if (list == null || list.size() == 0) { return 0; } int total = 0; for (int i = 0; i < list.size(); i = i + 1) { String s = list.get(i); if (s != null && s.length() == 5) { total = total + 1; } } return total; }

// A method that takes an ArrayList<String> as argument and // returns the number of Strings of length 5 it contains // // If list is null or the ArrayList is empty, return 0 // // USE AN ITERATOR-CONTROLLED WHILE LOOP public int HowManyStringsOfLength5_v3(ArrayList<String> list) { if (list == null || list.size() == 0) { return 0; } int total = 0; Iterator<String> it = list.iterator(); while (it.hasNext()) { String s = it.next(); if (s != null && s.length() == 5) { total = total + 1; } } return total; }

// A method that takes an ArrayList<String> and an int as arguments and // returns the number of Strings of the given length it contains // If list is null or the ArrayList is empty, return 0 public int howManyStringsOfGivenLength (ArrayList<String> list, int len) { int total = 0; for (String s : list) { if (s.length() == len) { total = total + 1; } } return total; }

// A method that takes a String as an argument and // returns true if the String starts with the uppercase // letter 'A', false otherwise public boolean StartsWithUpperCaseA(String s) { return s.charAt(0) == 'A'; } // A method that takes a char as an argument and // returns true if is is a lower case vowel (one // of 'a', 'e', 'i', 'o' or 'u', false otherwise. public boolean isVowel(char ch) { return ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u'; }

// A method that takes a String as an argument and // prints each char in the String on its own line, // with single quotes around each character. public void PrintChars(String s) { for (int i = 0; i < s.length(); i = i + 1) { System. out .println("'" + s.charAt(i) + "'"); } } // A method that takes a String as an argument and // returns true if the String contains an upper case // letter 'A', false otherwise public boolean ContainsUpperCaseA(String s) { for (int i = 0; i < s.length(); i = i + 1) { if (s.charAt(i) == 'A') { return true; } } return false; }

// A method that takes a String as an argument and // returns true if the String contains a lower case // vowel, false otherwise. public boolean ContainsVowel(String s) { for (int i = 0; i < s.length(); i = i + 1) { if (isVowel(s.charAt(i))) { return true; } } return false; } // A method that takes a String as an argument and // returns how many lower case vowels it contains. public int HowManyVowels(String s) { int total = 0; for (int i = 0; i < s.length(); i = i + 1) { if (isVowel(s.charAt(i))) { total = total + 1; } } return total; }