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 = "RingOfFire.text"; 19 String outputFileName = "RingOfFireReversed.text"; 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 //Read the words from the file into a dynamically growing ArrayList 29 ArrayList<String> words = new ArrayList<>(); 30 while (scanner.hasNext()){ 31 String word = scanner.next(); 32 words.add(word); 33 } 34 //Return the words 35 return words; 36 } 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 //Print the words to the file 43 for (int x = words.size() - 1; x >= 0; x = x - 1) { 44 printer.println(words.get(x)); 45 } 46 printer.close(); 47 } 48 49 private static Scanner establishScanner(String inputFileName) 50 throws FileNotFoundException { 51 String fullFileName = createFullFileName(inputFileName); 52 return new Scanner(new File(fullFileName)); 53 } 54 55 private static PrintWriter getPrintWriter(String outputFileName) 56 throws FileNotFoundException { 57 String fullFileName = createFullFileName(outputFileName); 58 PrintWriter printer = new PrintWriter(fullFileName); 59 return printer; 60 } 61 62 //Create the full file name for a simple file name, assuming that it will be 63 // found in the CS1Files/data subdirectory of the user's home directory. 64 private static String createFullFileName(String fileName) { 65 String separator = System.getProperty("file.separator"); 66 String home = System.getProperty("user.home"); 67 String path = home + separator + "CS1Files" +separator + "data" + separator; 68 String fullFileName = path + fileName; 69 return fullFileName; 70 } 71 } 72