1    /* 
2    * This program features an ArrayList to do its reverse copy thing 
3     */
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   
16       public static void main(String[] args) throws FileNotFoundException, IOException {
17           String inputFileName = "cantstop.text";
18           String outputFileName = "cantstopreversed.text";
19           ArrayList <String> words = readWordsFromFile(inputFileName);
20           writeWordsToFile(words,outputFileName);
21       }
22   
23   
24   
25       private static ArrayList<String> readWordsFromFile(String inputFileName)
26               throws FileNotFoundException {
27           // Equate a scanner with the input file
28           Scanner scanner = establishScanner(inputFileName);
29           // Read the words from the file into a dynamically growing ArrayList
30           ArrayList<String> words = new ArrayList<>();
31           while (scanner.hasNext()){
32               String word = scanner.next();
33               words.add(word);
34           }
35   
36           // Return the words
37           return words;
38       }
39   
40       private static void writeWordsToFile(ArrayList<String> words, String outputFileName)
41               throws IOException {
42           // Equate a printer with an output file
43           PrintWriter printer = getPrintWriter(outputFileName);
44           // Print the words to the file
45           for (int x = words.size() - 1; x >= 0; x = x - 1) {
46               printer.println(words.get(x));
47           }
48           printer.close();
49       }
50   
51       private static Scanner establishScanner(String inputFileName)
52               throws FileNotFoundException {
53           String fullFileName = createFullFileName(inputFileName);
54           return new Scanner(new File(fullFileName));
55       }
56   
57       private static PrintWriter getPrintWriter(String outputFileName)
58               throws FileNotFoundException {
59           String fullFileName = createFullFileName(outputFileName);
60           PrintWriter printer = new PrintWriter(fullFileName);
61           return printer;
62       }
63   
64       // Create the full file name for a simple file name, assuming that it will be
65       // found in the CS1Files/data subdirectory of the user’s home directory.
66       private static String createFullFileName(String fileName) {
67           String separator = System.getProperty("file.separator");
68           String home = System.getProperty("user.home");
69           String path = home + separator + "CS1Files" + separator + "data" + separator;
70           String fullFileName = path + fileName;
71           return fullFileName;
72       }
73   
74   }