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Stringbuffer
Strings example from a Well House Consultants training course
More on Strings [link]
Source code: malmesbury.java Module: J707
/* Stringbuffers
Characters can be held in Strings (immutable), Character Arrays ( char []) if you want to handle them as a series of individual characters, or Stringbuffers. A Stringbuffer is an object in which you can handles Strings as a whole, with facilities to extend and alter them in situ. This example reads a series of user inputs which it builds into a string buffer ... and it then converts it to a string from which it extracts the text in justified lines. */ public class malmesbury { public static void main(String[] args) { System.out.print ("Please enter a paragraph : "); String you_said; // Create a string buffer, and initialise it empty StringBuffer paragraph = new StringBuffer(""); // read from the user until he enters a blank line // build up entries in the stringbuffer while (!((you_said = WellHouseInput.readLine())).equals("")) { paragraph.append(you_said); paragraph.append(" "); } // convert back to a string so that we can print re-justified String textblock = paragraph.toString(); /* (The rest of the example contains nothing new ... we are just extracting word-by-word and composing lines of output.) */ int old_posn=0,posn=0,line_posn=0; while (posn>=0) { posn = textblock.indexOf(' ',old_posn); String next_word = (posn>0) ? textblock.substring(old_posn,posn+1): textblock.substring(old_posn); if ((next_word.length()+line_posn)>30) { line_posn=0; System.out.println(""); } System.out.print(next_word); old_posn = posn + 1; line_posn+=next_word.length(); } System.out.println(""); } } /* Sample output munchkin:j707 grahamellis$ java malmesbury Please enter a paragraph : The esamples in this section of the notes are all being supplied with additional material which includes sample output showing how they run. The esamples in this section of the notes are all being supplied with additional material which includes sample output showing how they run. munchkin:j707 grahamellis$ */ Learn about this subject
This module and example are covered on the following public courses:
* Learning to Program in Java * Java Bootcamp * Java Programming for the Web Also available on on site courses for larger groups Books covering this topic
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Other Examples
This example comes from our "Strings" training module. You'll find a description of the topic and some
other closely related examples on the "Strings" module index page.
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