1 /* 2 * Program featuring straight up arrays and file IO to read and reverse copy a lyric. 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 FileNotFoundException, IOException{ 16 String inputLyric = "Lyric.text"; 17 String outputLyric = "LyricReversed.text"; 18 String[] words = readWordsFromFile(inputLyric); 19 writeWordsToFile(words,outputLyric); 20 } 21 22 private static final int LIMIT = 1000; 23 24 private static String[] readWordsFromFile(String inputLyric) throws FileNotFoundException { 25 // Equate a scanner with the input file 26 Scanner scanner = establishScanner(inputLyric); 27 // Read the words from the file into an oversized 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 int wordCount = index; 36 // Transfer the words 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 private static void writeWordsToFile(String[] words, String outputLyric) throws IOException { 46 // Equate a printer with an output file 47 PrintWriter printer = getPrintWriter(outputLyric); 48 // Print the words to the file 49 for ( int x = words.length-1; x >= 0; x = x-1 ) { 50 printer.println(words[x]); 51 } 52 printer.close(); 53 } 54 55 private static Scanner establishScanner(String inputLyric) throws FileNotFoundException { 56 String fullLyric = createFullLyric(inputLyric); 57 return new Scanner (new File(fullLyric)); 58 } 59 60 private static PrintWriter getPrintWriter(String outputLyric) throws FileNotFoundException { 61 String fullLyric = createFullLyric(outputLyric); 62 PrintWriter printer = new PrintWriter(fullLyric); 63 return printer; 64 } 65 66 //Create the full file name for the simple file name, assuming that it will be 67 //found in the CS1Files/data subdirectory of the user's home directory. 68 private static String createFullLyric(String Lyric) { 69 String separator = System.getProperty("file.separator"); 70 String home = System.getProperty("user.home"); 71 String path = home + separator + "CS1Files" + separator + "data" + separator; 72 String fullLyric = path + Lyric; 73 return fullLyric; 74 } 75 } 76