1    /* 
2     *his program features an ArrayList to do its reverse copy thing 
3     *from one file to another. 
4     */
5    
6    package arraylistplay;
7    
8    
9    import java.io.File;
10   import java.io.FileNotFoundException;
11   import java.io.IOException;
12   import java.io.PrintWriter;
13   import java.util.ArrayList;
14   import java.util.Scanner;
15   
16   public class ReverseCopy {
17       public static void main(String [] args) throws FileNotFoundException, IOException {
18           String inputFileName = "FightSong.txt";
19           String outputFileName = "FightSongReversed.txt";
20           ArrayList<String> words = readWordsFromFile(inputFileName);
21           writeWordsToFile(words, outputFileName);
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           //Return the words
36           return words;
37       }
38   
39       private static void writeWordsToFile(ArrayList<String> words, String outputFileName)
40           throws IOException{
41           //Equate a printer with an output file
42           PrintWriter printer = getPrintWriter(outputFileName);
43           //Print the words to file
44           for(int x = words.size()-1; x>=0;x=x-1){
45               printer.println(words.get(x));
46           }
47           printer.close();
48       }
49   
50       private static Scanner establishScanner(String inputFileName)
51           throws FileNotFoundException{
52           String fullFileName = createFullFileName(inputFileName);
53           return new Scanner(new File(fullFileName));
54       }
55   
56       private static PrintWriter getPrintWriter (String outputFileName)
57           throws FileNotFoundException{
58           String fullFileName = createFullFileName(outputFileName);
59           PrintWriter printer = new PrintWriter(fullFileName);
60           return printer;
61   
62       }
63   
64       //Create the full file name for a simple file name, assuming that it will be
65       //found in the CS1File/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