1 /* 2 * Program featuring straight up arrays and file IO to read and reverse copy a lyric. 3 */ 4 package arrayplay; 5 6 import java.io.File; 7 import java.io.FileNotFoundException; 8 import java.io.IOException; 9 import java.io.PrintWriter; 10 import java.util.Scanner; 11 12 13 public class ReverseCopy { 14 15 public static void main(String[] args) throws FileNotFoundException, IOException { 16 String inputFileName = "TheGlory.text"; 17 String outputFileName = "TheGloryReversed.text"; 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 scanner = establishScanner(inputFileName); 27 // Read the words from the file into an over sized 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 } 36 int wordCount = index; 37 // transfer the words to a perfectly sized array 38 String[] words = new String[wordCount]; 39 for (int x = 0; x < wordCount; x = x + 1) { 40 words[x] = temp[x]; 41 42 } 43 // Return the words 44 return words; 45 46 } 47 48 private static void writeWordsToFile(String[] words, String outputFileName) throws IOException { 49 // Equate a printer with an output file 50 PrintWriter printer = getPrintWriter(outputFileName); 51 // Print the words to the file 52 for (int x = words.length - 1; x >= 0; x = x - 1) { 53 printer.println(words[x]); 54 } 55 printer.close(); 56 57 } 58 59 private static Scanner establishScanner(String inputFileName) throws FileNotFoundException { 60 String fullFileName = createFullFileName(inputFileName); 61 return new Scanner(new File(fullFileName)); 62 } 63 64 private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException { 65 String fullFileName = createFullFileName(outputFileName); 66 PrintWriter printer = new PrintWriter(fullFileName); 67 return printer; 68 69 } 70 71 private static String createFullFileName(String fileName) { 72 String separator = System.getProperty("file.separator"); 73 String home = System.getProperty("user.home"); 74 String path = home + separator + "CS1Files" + separator + "data" + separator; 75 String fullFileName = path + fileName; 76 return fullFileName; 77 } 78 79 }