1    package arraylist;
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   public class ReverseCopy {
11   
12       public static void main(String[] args) throws FileNotFoundException, IOException {
13           String inputFileName = "HereComesTrouble.text";
14           String outputFileName = "HereComesTroubleReversed.text";
15           ArrayList<String> words = readWordsFromFile(inputFileName);
16           writeWordsToFile(words, outputFileName);
17   
18       }
19   
20       private static ArrayList<String> readWordsFromFile(String inputFileName)
21               throws FileNotFoundException {
22           // Equate a scanner with the input file
23           Scanner scanner = establishScanner(inputFileName);
24           // Read the words from the file into a dynamically growing ArrayList
25           ArrayList<String> words = new ArrayList<>();
26           while (scanner.hasNext()) {
27               String word = scanner.next();
28               words.add(word);
29           }
30           // Return the words
31           return words;
32       }
33   
34       private static void writeWordsToFile(ArrayList<String> words, String outputFileName)
35               throws IOException {
36           // Equate a printer with an output file
37           PrintWriter printer = getPrintWriter(outputFileName);
38           // Print the words to the file
39           for (int x = words.size() - 1; x >= 0; x = x - 1) {
40               printer.println(words.get(x));
41           }
42           printer.close();
43       }
44   
45       private static Scanner establishScanner(String inputFileName)
46               throws FileNotFoundException {
47           String fullFileName = createFullFileName(inputFileName);
48           return new Scanner(new File(fullFileName));
49       }
50   
51       private static PrintWriter getPrintWriter(String outputFileName)
52               throws FileNotFoundException {
53           String fullFileName = createFullFileName(outputFileName);
54           PrintWriter printer = new PrintWriter(fullFileName);
55           return printer;
56       }
57   
58   
59       // Create the full file name for a simple file name, assuming that it will be
60       // found in the CS1Files/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   }
70