1    /* 
2    * This program features an ArrayList to do its reverse 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       public static void main(String[] args) throws FileNotFoundException, IOException {
17           String inputFileName = "wearemirage.text";
18           String outputFileName = "wearemirageReversed.text";
19           ArrayList<String> words = readWordsFromFile(inputFileName);
20           writeWordsToFile(words, outputFileName);
21       }
22   
23   
24       private static ArrayList<String> readWordsFromFile(String inputFileName) throws FileNotFoundException {
25           //Equate a scanner with the input file
26           Scanner scanner = establishScanner(inputFileName);
27           //Read the words from the file into a dynamically growing ArrayList
28           ArrayList<String> words = new ArrayList<>();
29           int index = 0;
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) throws IOException {
39           // Equate a printer with an output file
40           PrintWriter printer = getPrintWriter(outputFileName);
41           //Print the words to the file
42           for (int x = words.size() - 1; x >= 0; x = x - 1 ) {
43               printer.println(words.get(x));
44           }
45           printer.close();
46       }
47       private static Scanner establishScanner(String inputFileName) throws FileNotFoundException {
48           String fullFileName = createFullFileName(inputFileName);
49           return new Scanner(new File(fullFileName));
50       }
51   
52       private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException {
53           String fullFileName = createFullFileName(outputFileName);
54           PrintWriter printer = new PrintWriter(fullFileName);
55           return printer;
56       }
57   //Create the full file name for a simple file name, assuming that it willl be
58   //found in the CS1Files/data subdirectory of the user's home directory
59       private static String createFullFileName(String fileName) {
60           String separator = System.getProperty("file.separator");
61           String home = System.getProperty("user.home");
62           String path = home + separator + "CS1Files" + separator + "data" + separator;
63           String fullFileName = path + fileName;
64           return fullFileName;
65       }
66   }
67