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   
17       public static void main(String[] args) throws FileNotFoundException, IOException {
18           String inputFileName = "HeartOfGold.text";
19           String outputFileName = "HeartOfGoldReversed.text";
20           ArrayList<String> words = readWordsFromFile(inputFileName);
21           writeWordsToFile(words,outputFileName);
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 an oversized array
28           ArrayList<String> words = new ArrayList<>();
29           while (scanner.hasNext()) {
30               String word = scanner.next();
31               words.add(word);
32           }
33           //Return the words
34           return words;
35       }
36   
37       private static void writeWordsToFile(ArrayList<String> words, String outputFileName) throws IOException {
38           //Equate a printer with an output file
39           PrintWriter printer = getPrintWriter(outputFileName);
40           //Print the words to the file
41           for (int x = words.size()-1; x >= 0; x = x - 1) {
42               printer.println(words.get(x));
43           }
44           printer.close();
45       }
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   
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