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