1    /* 
2     * This program features an ArrayList to do its revers copy thing 
3     * from one file to another. 
4     */
5    
6    package arraylistplay;
7    
8    import java.io.File;
9    import java.io.FileNotFoundException;
10   import java.io.IOException;
11   import java.io.PrintWriter;
12   import java.util.ArrayList;
13   import java.util.Scanner;
14   
15   public class ReverseCopy {
16   
17       public static void main(String[] args) throws FileNotFoundException, IOException {
18           String inputFileName = "Time.txt";
19           String outputFileName = "TimeReversed.txt";
20           ArrayList<String> words = readWordsFromFile(inputFileName);
21           writeWordsToFile(words, outputFileName);
22       }
23   
24       private static ArrayList<String> readWordsFromFile(String inputFileName)
25               throws IOException {
26           // Equate a scanner with the input file
27           Scanner scanner = establishScanner(inputFileName);
28           // Read the words from the file into a 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   
39       private static void writeWordsToFile(ArrayList<String> words, String outputFileName)
40               throws IOException {
41           //Equate a printer with an output file
42           PrintWriter printer = getPrintWriter(outputFileName);
43           //Print the words to the file
44           for (int x = words.size() - 1; x >= 0; x = x - 1) {
45               printer.println(words.get(x));
46           }
47           printer.close();
48       }
49   
50       private static Scanner establishScanner(String inputFileName)
51               throws FileNotFoundException {
52           String fullFileName = createFullFileName(inputFileName);
53           return new Scanner(new File(fullFileName));
54       }
55   
56       private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException{
57           String fullFileName = createFullFileName(outputFileName);
58           PrintWriter printer = new PrintWriter(fullFileName);
59           return printer;
60       }
61   
62       // Create the full file name for a simple file name, assuming that it will be
63       // found in the CS1Files/data subdirectory of the user's home directory.
64   
65       private static String createFullFileName(String fileName) {
66           String separator = System.getProperty("file.separator");
67           String home = System.getProperty("user.home");
68           String path = home + separator + "public_html" + separator + "data" + separator;
69           String fullFileName = path + fileName;
70           return fullFileName;
71       }
72   
73   }
74   
75