reversetext.java

Beginning Java 2, SDK 1.4 Edition Exercise Code samples for this book

//Chapter 4, Exercise 5

public class ReverseText {
  public static void main(String args[]) {
    // The String that is to be processed with a few newlines to make the 
    // output a little more readable
    String text = "Into the face of the young man who sat on the terrace " +
                  "\nof the Hotel Magnifique at Cannes crept a look of furtive " +
                  "\nshame, the shifty, hangdog look which announces that " +
                  "\nan Englishman is about to talk French." ;

    boolean isWord = false;                              // Indicates start of a word found
    int start = 0;                                       // Index of word start
    StringBuffer reversedText = new StringBuffer();
    StringBuffer word = new StringBuffer();
    for(int i = 0 ; i<text.length() ; i++) {
      if(!isWord) {                                      // If we are not in a word...
        if(Character.isLetter(text.charAt(i))) {         // look for first letter of a word.
          word.append(text.charAt(i));                   // and append it to word
          isWord = true;                                 // Flag that we are in a word
        }
        else
          reversedText.append(text.charAt(i));
      }
      else {                                             // We are in a word 
        if(Character.isLetter(text.charAt(i)) || text.charAt(i) == '\'') {
          word.append(text.charAt(i));                   // Append to word
          continue;
        }                                            
        else {                                           // It is the end of the word
          reversedText.append(word.reverse());           // so append the reversed word
          reversedText.append(text.charAt(i));           // Don't forget the current character
          word.delete(0,word.length());                  // Delete the contents of word
          isWord = false;                                // and reset word indicator
        }
      }          
    }
    if(word.length()>0)                                  // Is there a last word?
      reversedText.append(word.reverse());               // If so append it - reversed of course.



    // Display the Reversed text
    System.out.println(reversedText);
  }
}