1    /* 
2    * Program featuring straight up arrays and file IO to read and reverse copy a lyric. 
3     */
4    
5    package arrayPlay;
6    
7    import java.io.File;
8    import java.io.FileNotFoundException;
9    import java.io.IOException;
10   import java.io.PrintWriter;
11   import java.util.Scanner;
12   
13   public class Whistle {
14       public static void main(String[] args) throws FileNotFoundException, IOException {
15           String inputFileName = "Whistle.text";
16           String outputFileName = "Whistle1.text";
17           String[] words = readWordsFromFile(inputFileName);
18           writeWordsToFile(words, outputFileName);
19   
20       }
21   
22       private static final int LIMIT = 1000;
23   
24       private static String[] readWordsFromFile(String inputFileName) throws FileNotFoundException {
25           //Equate a scanner with the input file
26           Scanner scanner = establishScanner(inputFileName);
27           //Read the words from the file into an oversized array
28           String[] temp = new String[LIMIT];
29           int index = 0;
30           while (scanner.hasNext()) {
31               String word= scanner.next();
32               temp[index] = word;
33               index = index + 1;
34           }
35           int wordCount = index;
36           //Transfer the words to a perfectly sized array
37           String[] words = new String[wordCount];
38           for (int x = 0; x < wordCount; x = x + 1) {
39               words[x] = temp[x];
40   
41           }
42           //return the words
43           return words;
44   
45       }
46       private static void writeWordsToFile (String [] words, String outputFileName) throws IOException{
47           //Equate a printer with an output file
48           PrintWriter printer= getPrintWriter(outputFileName);
49           //print the words to the file
50           for (int x= words.length-1; x>=0; x = x-1){
51               printer.println(words[x]);
52           }
53           printer.close();
54       }
55       private static Scanner establishScanner( String inputFileName) throws FileNotFoundException{
56           String fullFileName= createFullFileName(inputFileName);
57           Scanner scanner = new Scanner(new File(fullFileName));
58           return scanner;
59       }
60       private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException{
61           String fullFileName= createFullFileName(outputFileName);
62           PrintWriter printer= new PrintWriter(fullFileName);
63           return printer;
64       }
65       //Create the full file name for a somple file name, assuming that it will be
66       // found in the CS1Files/data subdirectory of the user's home directory
67   
68       private static String createFullFileName(String fileName){
69           String seperator= System.getProperty("file.separator");
70           String home= System.getProperty("user.home");
71           String path= home+ seperator+ "CS1Files" + seperator+ "data"+ seperator;
72           String fullFileName= path+ fileName;
73           return fullFileName;
74       }
75   
76   }
77