1    /* 
2     * This program features an ArrayList to do its reverse copy thing 
3     * from one file to another. 
4     */
5    package arraylistplay;
6    
7    import java.io.File;
8    import java.io.FileNotFoundException;
9    import java.io.IOException;
10   import java.io.PrintWriter;
11   import java.util.ArrayList;
12   import java.util.Scanner;
13   
14   public class ReverseCopy {
15       public static void main (String[] args) throws FileNotFoundException, IOException {
16           String inputFileName = "YouAreTheReason.text";
17           String outputFileName = "YouAreTheReasonReversed.text";
18           ArrayList <String> words = readWordFromFile (inputFileName);
19           writeWordsToFile(words,outputFileName);
20       }
21   
22   //    private static final int LIMIT = 1000;
23   
24       private static void writeWordsToFile(ArrayList<String> words, String outputFileName) throws FileNotFoundException {
25           // Equate a printer with an output file
26           PrintWriter printer = getPrintWriter(outputFileName);
27           // Print the words to the file
28           for ( int x = words.size()-1; x>= 0; x = x-1) {
29               printer.println(words.get(x));
30           }
31           printer.close();
32       }
33   
34       private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException {
35           String fullFileName = createFullFileName(outputFileName);
36           PrintWriter printer = new PrintWriter(fullFileName);
37           return printer;
38       }
39   
40       private static ArrayList<String> readWordFromFile(String inputFileName) throws FileNotFoundException {
41           // Equate a scanner the input file
42           Scanner scanner = establishScanner (inputFileName);
43           // Red the words from the file into a dynamically growing ArrayList
44   //        String[] temp = new String[LIMIT];
45           ArrayList<String> words = new ArrayList<>();
46           while ( scanner.hasNext() ) {
47               String word = scanner.next();
48               words.add(word);
49           }
50           //return the words
51           return words;
52       }
53   
54       private static Scanner establishScanner(String inputFileName) throws FileNotFoundException {
55           String fullFileName = createFullFileName (inputFileName);
56           return new Scanner(new File(fullFileName));
57       }
58   
59       // Create the full file name for a simple file name, assuming that it will be
60       // found in the SC1Files/data subdirectory of the user's home directory.
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