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