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 public class ReverseCopy { 11 public static void main(String[] args) throws FileNotFoundException, IOException { 12 String inputFileName = "wolvesLyrics.text"; 13 String outputFileName = "wolvesLyricsReversed"; 14 ArrayList<String> words = readWordsFromFile(inputFileName); 15 writeWordsToFile(words, outputFileName); 16 17 } 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 the 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 33 private static void writeWordsToFile(ArrayList<String> words, String outputFileName) 34 throws IOException { 35 // Equate a printer with an output file 36 PrintWriter printer = getPrintWriter(outputFileName); 37 // Print the words to the file 38 for (int x = words.size() - 1; x >= 0; x = x - 1) { 39 printer.println(words.get(x)); 40 } 41 printer.close(); 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 50 private static PrintWriter getPrintWriter(String outputFileName) 51 throws FileNotFoundException { 52 String fullFileName = createFullFileName(outputFileName); 53 PrintWriter printer = new PrintWriter(fullFileName); 54 return printer; 55 } 56 57 // Create the full file name for a simple file name, assuming that it will be 58 // found in the CS1Files/data subdirectory of the user's home directory. 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