1    /* 
2     * Program featuring straight up arrays and file IO to read and reverse copy a lyric. 
3     */
4    package arrayplay;
5    
6    import java.io.File;
7    import java.io.FileNotFoundException;
8    import java.io.IOException;
9    import java.io.PrintWriter;
10   import java.util.Scanner;
11   
12   public class ReverseCopy {
13       public static void main(String[] args) throws FileNotFoundException, IOException {
14           String inputFileName = "Waste.text";
15           String outputFileName = "WasteReversed.text";
16           String[] words = readWordsFromFile(inputFileName);
17           writeWordsToFile(words, outputFileName);
18       }
19   
20       private static final int LIMIT = 1000;
21   
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           int wordCount = index;
34           //Transfer the words to a perfectly sized array
35           String[] words = new String[wordCount];
36           for ( int x = 0; x < wordCount; x = x + 1) {
37               words[x] = temp[x];
38           }
39           //Return the words
40           return words;
41       }
42   
43       private static void writeWordsToFile(String[] words, String outputFileName) throws IOException {
44           //Equate a printer with an output file
45           PrintWriter printer = getPrintWriter((outputFileName));
46           //Print the words to the file
47           for ( int x = words.length-1; x >= 0; x = x - 1) {
48               printer.println(words[x]);
49           }
50           printer.close();
51       }
52   
53       private static Scanner establishScanner(String inputFileName) throws FileNotFoundException {
54           String fullFileName = createFullFileName(inputFileName);
55           return new Scanner(new File(fullFileName));
56       }
57   
58       private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException {
59           String fullFileName = createFullFileName(outputFileName);
60           PrintWriter printer = new PrintWriter(fullFileName);
61           return printer;
62       }
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