7.4.7. Free Response - StringFormatter A¶
The following is a free response question from 2016. It was question 4 part A on the exam. You can see all the free response questions from past exams at https://apstudents.collegeboard.org/courses/ap-computer-science-a/free-response-questions-by-year.
This question involves the process of taking a list of words, called
wordList, and producing a formatted string of a specified length.
wordList contains at least two words, consisting of letters only.
When the formatted string is constructed, spaces are placed in the gaps between words so that as many spaces as possible are evenly distributed to each gap.
The equal number of spaces inserted into each gap is referred to as the basic gap width.
Any leftover spaces are inserted one at a time into the gaps from left to right until there are no more leftover spaces.
The following three examples illustrate these concepts. In each example, the list of words is to be placed into a formatted string of length 20.
The leftover spaces are inserted one at a time between the words from left to right until there are no more leftover spaces. In this example, the first two gaps get an extra space.
You will implement three static methods in a class named
StringFormatter that is not shown.
220.127.116.11. Part A¶
(a) Write the
totalLetters, which returns the total number of letters in the words in its parameter
For example, if the
variableList<String> words is [“A”, “frog”, “is”],then the call
StringFormatter.totalLetters(words) returns 7.
You may assume that all words in
wordList consist of one or more letters.
/** Returns the total number of letters in wordList. * Precondition: wordList contains at least two words, consisting of letters only. */ public static int totalLetters(List<String> wordList)
18.104.22.168. How to Solve Part A¶
Click to reveal the algorithm and multiple choice problems that may help you write your solution.
22.214.171.124. Put the Code in Order¶
126.96.36.199. Write the Code¶
Finish writing the
totalLetters method below so that it returns the number of letters for all the strings in
main method below will test your code to check that you solved it correctly.