1 /* 2 * This Program features 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 public static void main(String[] args) throws FileNotFoundException, IOException { 15 String inputFileName = "westvirginia.text"; 16 String outputFileName = "westvirginiareversed.text"; 17 String [] words = readWordsFromFile(inputFileName); 18 writeWordsToFile(words,outputFileName); 19 } 20 21 private static final int LIMIT = 1000; 22 23 private static String[] readWordsFromFile(String inputFileName) throws FileNotFoundException { 24 // Equate a scanner with the input file 25 Scanner scanner = establishScanner(inputFileName); 26 // Read the words from the file into a dynamically growing ArrayList 27 String[] temp = new String[LIMIT]; 28 int index = 0; 29 while (scanner.hasNext()) { 30 String word = scanner.next(); 31 temp[index] = word; 32 index = index + 1; 33 } 34 int wordCount = index; 35 String[] words = new String[wordCount]; 36 for( int x = 0; x < wordCount; x = x + 1){ 37 words[x] = temp[x]; 38 } 39 // Return the words 40 return words; 41 } 42 43 private static void writeWordsToFile(String[] words, String outputFileName) throws IOException { 44 // Equate a printer with an output file 45 PrintWriter printer = getPrintWriter(outputFileName); 46 // Print the words to the file 47 for (int x = words.length - 1; x >= 0; x = x - 1) { 48 printer.println(words[x]); 49 } 50 printer.close(); 51 } 52 53 private static Scanner establishScanner(String inputFileName) throws FileNotFoundException { 54 String fullFileName = createFullFileName(inputFileName); 55 return new Scanner(new File(fullFileName)); 56 } 57 58 private static PrintWriter getPrintWriter(String outputFileName) throws FileNotFoundException { 59 String fullFileName = createFullFileName(outputFileName); 60 PrintWriter printer = new PrintWriter(fullFileName); 61 return printer; 62 } 63 64 // Create the full file name for a simple file name, assuming that it will be 65 // found in the CS1Files/data subdirectory of the user’s home directory. 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 } 75