1    package arrayplay;
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.Scanner;
8    
9    public class ReverseCopy {
10       public static void main(String[] args) throws FileNotFoundException, IOException {
11           String inputFileName = "StarSpangledBanner.text";
12           String outputFileName = "StarSpangledBannerReversed.text";
13           String[] words = readWordsFromFile(inputFileName);
14           writeWordsToFile(words,outputFileName);
15       }
16   
17       private static void writeWordsToFile(String[] words, String outputFileName) throws IOException {
18           // Equate a printer with an output file
19           PrintWriter printer = getPrintWriter(outputFileName);
20           // Print the words to the file
21           for(int x = words.length-1; x >= 0; x = x - 1){
22               printer.println(words[x]);
23           }
24           printer.close();
25       }
26   
27       private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException {
28           String fullFileName = createFullFileName(outputFileName);
29           PrintWriter printer = new PrintWriter(fullFileName);
30           return printer;
31       }
32   
33       private static final int LIMIT = 1000;
34   
35       private static String[] readWordsFromFile(String inputFileName) throws FileNotFoundException {
36           //Equate a scanner with the input file
37           Scanner scanner = establishScanner(inputFileName);
38           // Read the words from the file into an oversized array
39           String[] temp = new String[LIMIT];
40           int index = 0;
41           while(scanner.hasNext()){
42               String word = scanner.next();
43               temp[index] = word;
44               index = index + 1;
45           }
46           int wordCount = index;
47           // Transfer the words to a perfectly sized array
48           String[] words = new String[wordCount];
49           for(int x = 0; x < wordCount; x = x + 1){
50               words[x] = temp[x];
51           }
52           // Return the words
53           return words;
54       }
55   
56       private static Scanner establishScanner(String inputFileName) throws FileNotFoundException {
57           String fullFileName = createFullFileName(inputFileName);
58           return new Scanner(new File(fullFileName));
59       }
60   
61       // Create a full file name for a simple file name, assuming that it will be found in the CS1/data subdirectory of the users home directory
62       private static String createFullFileName(String fileName) {
63           String separator = System.getProperty("file.separator");
64           String home = System.getProperty("user.home");
65           String path = home + separator + "CS1Files" + separator + "data" + separator;
66           String fullFileName = path + fileName;
67           return fullFileName;
68       }
69   }
70