1    /* 
2     * This program features an ArrayList to do its reverse copy thing from one file to another 
3     */
4    package arraylistplay;
5    import java.io.File;
6    import java.io.FileNotFoundException;
7    import java.io.IOException;
8    import java.io.PrintWriter;
9    import java.util.ArrayList;
10   import java.util.Scanner;
11   
12   
13   public class ReverseCopy {
14       public static void main(String[] args) throws FileNotFoundException, IOException {
15           String inputFileName = "DesolationRow.text";
16           String outputFileName = "DesolationRowReversed.text";
17           ArrayList<String> words = readWordsFromFile(inputFileName);
18           writeWordsToFile(words, outputFileName);
19       }
20   
21       private static ArrayList<String> readWordsFromFile(String inputFileName)
22               throws FileNotFoundException {
23           // Equate a scanner with the input file
24           Scanner scanner = establishScanner(inputFileName);
25           // Read the words from the file into a dynamically growing ArrayList
26           ArrayList<String> words = new ArrayList<>();
27           while (scanner.hasNext()) {
28               String word = scanner.next();
29               words.add(word);
30           }
31           // Return the words
32           return words;
33       }
34   
35       private static void writeWordsToFile(ArrayList<String> words, String outputFileName)
36               throws IOException {
37           //Equate a printer with an output file
38           PrintWriter printer = getPrintWriter(outputFileName);
39           // Print the words to the file
40           for (int x = words.size() - 1; x >= 0; x = x-1) {
41               printer.println(words.get(x));
42           }
43           printer.close();
44       }
45       private static Scanner establishScanner(String inputFileName)
46               throws FileNotFoundException {
47           String fullFileName = createFullFileName(inputFileName);
48           return new Scanner(new File(fullFileName));
49       }
50       private static PrintWriter getPrintWriter(String outputFileName)
51               throws FileNotFoundException {
52           String fullFileName = createFullFileName(outputFileName);
53           PrintWriter printer = new PrintWriter(fullFileName);
54           return printer;
55       }
56       // Create the full file name for a simple file name, assuming that it will be
57       // found in the CS1File/data subdirectory of the user's home directory.
58       private static String createFullFileName(String fileName) {
59           String separator = System.getProperty("file.separator");
60           String home = System.getProperty("user.home");
61           String path = home + separator + "CS1Files" + separator + "data" + separator;
62           String fullFileName = path + fileName;
63           return fullFileName;
64       }
65   
66   }
67