1 /* 2 * This program features an ArrayList to do its reverse copy thing 3 * from one file to another. 4 */ 5 6 package arraylistplay; 7 8 import java.io.File; 9 import java.io.FileNotFoundException; 10 import java.io.IOException; 11 import java.io.PrintWriter; 12 import java.util.ArrayList; 13 import java.util.Scanner; 14 15 public class ReverseCopy { 16 17 public static void main (String[] args) throws FileNotFoundException, IOException { 18 String inputFileName = "Lyric2"; 19 String outputFileName = "Lyric2Reversed"; 20 ArrayList<String> words = readWordsFromFile(inputFileName); 21 writeWordsToFile(words, outputFileName); 22 } 23 24 private static ArrayList<String> readWordsFromFile(String inputFileName) 25 throws FileNotFoundException { 26 // Equate a scanner with the input file 27 Scanner scanner = establishScanner(inputFileName); 28 29 // Read the words from the file into a dynamically growing ArrayList 30 ArrayList<String> words = new ArrayList<>(); 31 while (scanner.hasNext()) { 32 String word = scanner.next(); 33 words.add(word); 34 } 35 // Return the words 36 return words; 37 } 38 private static void writeWordsToFile(ArrayList<String> words, String outputFileName) 39 throws IOException { 40 // Equate a printer with an output file 41 PrintWriter printer = getPrintWriter(outputFileName); 42 43 // Print the words to the file 44 for (int x = words.size() - 1; x >= 0; x = x - 1) { 45 printer.println(words.get(x)); 46 } 47 printer.close(); 48 } 49 50 private static Scanner establishScanner(String inputFileName) 51 throws FileNotFoundException { 52 String fullFileName = createFullFileName(inputFileName); 53 return new Scanner(new File(fullFileName)); 54 } 55 56 private static PrintWriter getPrintWriter(String outputFileName) 57 throws FileNotFoundException{ 58 String fullFileName = createFullFileName(outputFileName); 59 PrintWriter printer = new PrintWriter(fullFileName); 60 return printer; 61 } 62 63 // Create the full file name for a simple file name, assuming that it will be 64 // found in the CS1Files/data subdirectory of the user's home directory. 65 66 private static String createFullFileName(String fileName) { 67 String separator = System.getProperty("file.separator"); 68 String home = System.getProperty("user.home"); 69 String path = home + separator + "CS1Files" + separator + "data" + separator; 70 String fullFileName = path + fileName; 71 return fullFileName; 72 } 73 74 }