1    /* 
2    * Program featuring straight up arrays and file IO to read and reverse copy a lyric. 
3     */
4    
5    package arrayplay;
6    
7     import java.io.File;
8     import java.io.FileNotFoundException;
9     import java.io.IOException;
10    import java.io.PrintWriter;
11    import java.util.Scanner;
12   
13    public class ReverseCopy {
14        public static void main(String[] args) throws FileNotFoundException, IOException {
15            String inputFileName = "rowrowrowyourboat.text";
16            String outputFileName = "rowrowrowyourboatReversed.text";
17            String[] words = readWordsFromFile(inputFileName);
18            writeWordsToFile(words,outputFileName);
19        }
20   
21        private static final int LIMIT = 1000;
22        private static String[] readWordsFromFile(String inputFileName) throws FileNotFoundException {
23            // Equate a scanner with the input file
24            Scanner scanner = establishScanner(inputFileName);
25            // Read the words from the file into an oversized array
26            String[] temp = new String[LIMIT];
27            int index = 0;
28            while ( scanner.hasNext() ) {
29             String word = scanner.next();
30                temp[index] = word;
31                index = index + 1;
32            }
33   
34            int wordCount = index;
35            // Transfer the words to a perfectly sized array
36            String[] words = new String[wordCount];
37            for ( int x = 0; x < wordCount; x = x + 1 ) {
38                words[x] = temp[x];
39            }
40            // Return the words
41            return words;
42        }
43   
44        private static void writeWordsToFile(String[] words, String outputFileName) throws IOException {
45            // Equate a printer with an output file
46            PrintWriter printer = getPrintWriter(outputFileName);
47            // Print the words to the file
48            for ( int x = words.length-1; x >= 0; x = x - 1 ) {
49                printer.println(words[x]);
50            }
51            printer.close();
52        }
53   
54           private static Scanner establishScanner(String inputFileName) throws FileNotFoundException {
55            String fullFileName = createFullFileName(inputFileName);
56            return new Scanner(new File(fullFileName));
57            }
58   
59           private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException {
60            String fullFileName = createFullFileName(outputFileName);
61            PrintWriter printer = new PrintWriter(fullFileName);
62            return printer;
63            }
64   
65           // Create the full file name for a simple file name, assuming that it will be
66           // found in the CS1Files/data subdirectory of the user’s home directory.
67           private static String createFullFileName(String fileName) {
68               String separator = System.getProperty("file.separator");
69               String home = System.getProperty("user.home");
70               String path = home + separator + "CS1Files" + separator + "data" + separator;
71               String fullFileName = path + fileName;
72               return fullFileName;
73        }
74    }
75   
76