1    /* 
2     * Program featuring straight up arrays and file IO to read and reverse copy a lyric. 
3     */
4    package arraylistplay;
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 = "ReadAllAboutIt.txt";
15           String outputFileName = "ReadAllAboutItReversed.txt";
16           ArrayList <String> words = readWordsFromFile(inputFileName);
17           writeWordsToFile(words, outputFileName);
18       }
19       private static final int LIMIT = 1000;
20   
21       private static String[] readWordsFromFile (String inputFileName) throws FileNotFoundException {
22           //Equate a scanner with the input file
23           Scanner scanner = establishScanner(inputFileName);
24           // Read the words from the file intoan oversized array
25           String[] temp = new String[LIMIT];
26           int index = 0;
27           while (scanner.hasNext()) {
28               String word = scanner.next();
29               temp[index] = word;
30               index = index + 1;
31           }
32           int wordCount = index;
33           //Transfer the words to a perfectly sized array
34           String[] words = new String[wordCount];
35           for (int x = 0; x < wordCount; x = x + 1) {
36               words[x] = temp[x];
37           }
38           //RETURN THE WORDS
39           return words;
40       }
41   
42       private static void writeWordsToFile (String[] words, String outputFileName) throws IOException {
43           //EQUATE A PRINTER WITH AN OUTPUT FILE
44           PrintWriter printer = getPrintWriter(outputFileName);
45           //PRINT THE WORDS TO THE FILE
46           for (int x = words.length - 1; x >= 0; x = x - 1) {
47               printer.println(words[x]);
48           }
49           printer.close();
50       }
51   
52       private static Scanner establishScanner (String inputFileName) throws FileNotFoundException {
53           String fullFileName = createFullFileName(inputFileName);
54           return new Scanner(new File(fullFileName));
55       }
56   
57       private static PrintWriter getPrintWriter (String outputFileName) throws FileNotFoundException {
58           String fullFileName = createFullFileName(outputFileName);
59           PrintWriter printer = new PrintWriter(fullFileName);
60           return printer;
61       }
62   
63       //CREATE THE FULL FILE NAME FOR A SIMPLE FILE NAME, ASSUMING THAT IT WILL BE FOUND IN THE CS1FILES/DATA
64       // SUBDIRECTORY OF THE USER'S HOME DIRECTORY
65   
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   }