1    /* 
2     * Program featuring straight up arrays and file IO to read and reverse copy a lyric. 
3     */
4    
5    
6    package arrayplay;
7    
8    import java.io.File;
9    import java.io.FileNotFoundException;
10   import java.io.IOException;
11   import java.io.PrintWriter;
12   import java.util.Scanner;
13   
14   public class ReverseCopy {
15       public static void main(String[] args) throws FileNotFoundException, IOException {
16           String inputFileName = "Wavin'Flag.text";
17           String outputFileName = "Wavin'FlagReversed.text";
18           String[] words = readWordsFromFile(inputFileName);
19           writeWordsToFile(words,outputFileName);
20       }
21       private static final int LIMIT = 1000;
22   
23       private static String[] readWordsFromFile(String inputFileName) throws FileNotFoundException {
24           // Equate a scanner with the input file
25           Scanner scanner = establishScanner(inputFileName);
26           // Read the words from the file into an oversized array
27           String[] temp = new String[LIMIT];
28           int index = 0;
29           while ( scanner.hasNext() ) {
30               String word = scanner.next();
31               temp[index] = word;
32               index = index + 1;
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       // Create the full file name for a simple file name, assuming that it will be
65       // found in the CS1Files/data subdirectory of the user’s home directory.
66       private static String createFullFileName(String fileName) {
67           String separator = System.getProperty("file.separator");
68           String home = System.getProperty("user.home");
69           String path = home + separator + "CS1Files" + separator + "data" + separator;
70           String fullFileName = path + fileName;
71           return fullFileName;
72       }
73   }
74