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.*;
9    import java.util.*;
10   
11   public class ReverseCopy {
12   
13       public static void main(String[] args) throws FileNotFoundException, IOException {
14   
15           String inputFileName = "AllToMyself.text";
16           String outputFileName = "AllToMyselfReversed.text";
17           ArrayList<String> words = readWordsFromFile(inputFileName);
18           writeWordsToFile(words, outputFileName);
19   
20       }
21   
22       private static ArrayList<String> readWordsFromFile(String inputFileName) 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   
36       private static void writeWordsToFile(ArrayList<String> words, String outputFileName) 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   
46       private static Scanner establishScanner(String inputFileName) throws FileNotFoundException {
47           String fullFileName = createFullFileName(inputFileName);
48           return new Scanner(new File(fullFileName));
49   
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   
58       //Create the full file name for a simple file name, assuming that it will be
59       //found in the CS1Files/data subdirectory of the user's home directory.
60   
61       private static String createFullFileName(String fileName) {
62           String separator = System.getProperty("file.separator");
63           String home = System.getProperty("user.home");
64           String path = home + separator + "CS1Files" + separator + "data" + separator;
65           String fullFileName = path + fileName;
66           return fullFileName;
67   
68       }
69   
70   }
71