1    //Program that uses ArrayList to make a reverse copy of a file to a new file
2    package arraylistplay;
3    
4    
5    import java.io.File;
6    import java.io.FileNotFoundException;
7    import java.io.IOException;
8    import java.io.PrintWriter;
9    import java.util.ArrayList;
10   import java.util.Scanner;
11   
12   public class ReverseCopy {
13       public static void main(String[] args) throws IOException {
14           String inputFileName = "ArianaSong";
15           String outputFileName = "ArianaSongReversed";
16           ArrayList<String> words = readWordsFromFile(inputFileName);
17           writeWordstoFile(words, outputFileName);
18       }
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   
37       private static void writeWordstoFile(ArrayList<String> words, String outputFileName) throws IOException {
38           //Equate a printer with and 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   
48   
49       private static Scanner establishScanner(String inputFileName) throws FileNotFoundException {
50           String fullFileName = createFullFileName(inputFileName);
51           return new Scanner(new File(fullFileName));
52       }
53       private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException {
54           String fullFileName = createFullFileName(outputFileName);
55           PrintWriter printer = new PrintWriter(fullFileName);
56           return printer;
57       }
58   
59       private static String createFullFileName(String fileName) {
60           String separator = System.getProperty("file.separator");
61           String home = System.getProperty("user.home");
62           String path = home + separator + "CS1Files" + separator + "data" + separator;
63           String fullFileName = path + fileName;
64           return fullFileName;
65       }
66   
67   }
68