1    //This program features an ArrayList to do its reverse copy thing from one file to another.
2    
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.ArrayList;
11   import java.util.Scanner;
12   
13   public class ReverseCopy {
14   
15       public static void main(String[] args) throws FileNotFoundException, IOException {
16           String inputFileName = "musiclyrics.text";
17           String outputFileName = "DesolationRowReversed.text";
18           ArrayList<String> words = readWordsFromFile(inputFileName);
19           writeWordsToFile(words, outputFileName);
20       }
21   
22   
23   
24       private static ArrayList<String> readWordsFromFile(String inputFileName)
25           throws FileNotFoundException {
26               //Equate a scanner with the input file
27            Scanner scanner = establishScanner(inputFileName);
28           //Read the words from the file into dynamically growing ArrayList
29           ArrayList<String> words = new ArrayList<>();
30           while (scanner.hasNext()) {
31               String word = scanner.next();
32               words.add(word);
33           }
34           //Return the words
35           return words;
36           }
37   
38           private static void writeWordsToFile(ArrayList<String> words, String outputFileName)
39           throws IOException {
40               //Equate a printer with an output file
41               PrintWriter printer = getPrintWriter(outputFileName);
42               //Print the words to the file
43               for (int x = words.size() - 1; x >= 0; x = x - 1 ) {
44                   printer.println(words.get(x));
45           }
46               printer.close();
47       }
48   
49       private static Scanner establishScanner(String inputFileName)
50           throws FileNotFoundException {
51           String fullFileName = createFullFileName(inputFileName);
52           return new Scanner(new File(fullFileName));
53   
54       }
55   
56       private static PrintWriter getPrintWriter(String outputFileName)
57           throws FileNotFoundException {
58           String fullFileName = createFullFileName(outputFileName);
59           PrintWriter printer  = new PrintWriter(fullFileName);
60           return printer;
61       }
62       //Create the full file name for a simple file name, assuming that it will be found in the CS1Files/data subdirectory
63       //of the users home directory.
64       private static String createFullFileName(String fileName) {
65           String separator = System.getProperty("file.separator");
66           String home = System.getProperty("user.home");
67           String path = home + separator + "CS1Files" + separator + "data" + separator;
68           String fullFileName = path + fileName;
69           return fullFileName;
70       }
71   
72   }
73