1    package arraylistplay;
2    
3    import java.io.File;
4    import java.io.FileNotFoundException;
5    import java.io.IOException;
6    import java.io.PrintWriter;
7    import java.util.ArrayList;
8    import java.util.Scanner;
9    
10   
11   
12   public class ReverseCopy {
13       public static void main(String[] args) throws FileNotFoundException, IOException{
14           String inputFileName = "TheCrunch.text";
15           String outputFileName = "TheCrunchReversed.text";
16           ArrayList<String> words = readWordsFromFile(inputFileName);
17           writeWordsToFile(words, outputFileName);
18       }
19       private static ArrayList<String> readWordsFromFile(String inputFileName)
20           throws FileNotFoundException {
21           //Equate a scanner with the input file
22           Scanner scanner = establishScanner(inputFileName);
23           //Read words from the file into a dynamically growing ArrayList
24           ArrayList<String> words = new ArrayList<>();
25           while (scanner.hasNext()) {
26               String word = scanner.next();
27               words.add(word);
28           }
29           //return the words
30           return words;
31       }
32       private static void writeWordsToFile(ArrayList<String> words, String outputFileName)
33               throws IOException {
34           //equate a printer with an output file
35           PrintWriter printer = getPrintWriter(outputFileName);
36           //print the words to the file
37           for (int x = words.size() - 1; x >= 0; x = x - 1) {
38               printer.println(words.get(x));
39           }
40           printer.close();
41       }
42   
43   
44       private static Scanner establishScanner(String inputFileName)
45           throws FileNotFoundException {
46           String fullFileName = createFullFileName(inputFileName);
47           return new Scanner(new File(fullFileName));
48       }
49           private static PrintWriter getPrintWriter(String outputFileName)
50           throws FileNotFoundException {
51               String fullFileName = createFullFileName(outputFileName);
52               PrintWriter printer = new PrintWriter(fullFileName);
53               return printer;
54       }
55       //create the full file name for a simple file name, assuming that it will be
56           //found in the CS1Files/data subdirectory of the user's home directory.
57           private static String createFullFileName(String fileName) {
58               String separator = System.getProperty("file.separator");
59               String home = System.getProperty("user.home");
60               String path = home + separator + "CS1Files" + separator + "data" + separator;
61               String fullFileName = path + fileName;
62               return fullFileName;
63           }
64   }
65   
66