1 /* 2 * This features arrays and file IO ro reverse copy lyrics to a song 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 ReverseCopy { 14 15 public static void main(String[] args) throws IOException { 16 String inputFileName = "MyNameHuman"; 17 String outputFileName = "MyNameHumanReversed"; 18 String[] words = readWordsFromFile(inputFileName); 19 writeWordsToFile(words, outputFileName); 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 scan = 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 (scan.hasNext()) { 31 String word = scan.next(); 32 temp[index] = word; 33 index = index + 1; 34 } 35 int wordCount = index; 36 //Transfer the wors 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 //Return the words 42 return words; 43 } 44 45 46 private static void writeWordsToFile(String[] words, String outputFileName) throws IOException { 47 PrintWriter printer = getPrintWriter(outputFileName); 48 for (int x = words.length - 1; x >= 0; x = x - 1) { 49 printer.println(words[x]); 50 } 51 printer.close(); 52 } 53 54 55 private static Scanner establishScanner(String inputFileName) throws FileNotFoundException { 56 String fullFileName = createFullFileName(inputFileName); 57 return new Scanner(new File(fullFileName)); 58 } 59 60 61 private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException { 62 String fullFileName = createFullFileName(outputFileName); 63 PrintWriter printer = new PrintWriter(fullFileName); 64 return printer; 65 } 66 67 // Create the full file name for a simple file name, assuming that it will be 68 // found in the CS1Files/data subdirectory of the user’s home directory. 69 private static String createFullFileName(String fileName) { 70 String separator = System.getProperty("file.separator"); 71 String home = System.getProperty("user.home"); 72 String path = home + separator + "CS1Files" + separator + "data" + separator; 73 String fullFileName = path + fileName; 74 return fullFileName; 75 } 76 }