1    /* 
2    * Program featuring straight up arrays and file IO to read and reverse copy a lyric. 
3    */
4    
5            package arrayplay;
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 = "DrivingToHawaii.text";
15                           String outputFileName = "DrivingToHawaiiReversed.text";
16                           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 into an 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                   /* 
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                   */
67   
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