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Java Forum / General / January 2007Replace method in stringbuffer
OMG. This is like my worst nightmare. i wanted to replace all "*" with "occupant". like for instance: by doing alot of research i still cannot get a good description on stirngbuffer replace method. here is my program for the time being. i wanted to keep it as simple. class MailGenerator { public static void main(String[] args) { String st = ("I have * exciting * news for you, *!!!. For just $49.99 plus postage"); StringBuffer sb = new StringBuffer(st); sb.replaceAll(st, "*", "Occupant"); System.out.println(sb); } } i want to replace * by occupant. i cant seem to rite replaceall method. i looked at the api it asks for the starting index and ending index. i can't make any sense of it. appreciate any help. Use String's replaceAll instead : st = st.replaceAll( "\\*", "Occupant"); -- http://javalessons.com Paul Hamaker, SEMM Teaching ICT since 1987 > Use String's replaceAll instead : > st = st.replaceAll( "\\*", "Occupant"); > -- > http://javalessons.com Paul Hamaker, SEMM > Teaching ICT since 1987 Paul thanks alot. i know i can easily use the string.replaceAll method but since i am new to this stringbuffer i would like in which i have been successful. There is no StringBuffer.replaceAll() method. There is a String.replaceAll(String regex, String replacement) method though that uses regular expression and is simple to use. If you absolutely need to replace the chars inside a StringBuffer then you should create your own replaceAll() method. You should use SringBuffer.indexOf(String str, int from) and SringBuffer.replace(int start, int end, String str) methods in a loop to implement it. Regards > There is no StringBuffer.replaceAll() method. > There is a String.replaceAll(String regex, String replacement) method [quoted text clipped - 6 lines] > > Regards This is what i really wanted to do. but for some reasons due to my lack of knowledge with this stringbuffer i can't make a method and when i do make a method it gives me error. what is my start, what is my end? those questions still remains unanswered. i would like an example with some comments. Thanks ... > ...i would like an example with some comments. I would like a pony. Andrew T. >> There is no StringBuffer.replaceAll() method. >> There is a String.replaceAll(String regex, String replacement) method [quoted text clipped - 13 lines] > some comments. > Thanks Is the problem lack of access to the API documentation, or inability to apply it? In particular, have you read the API documentation for both replace and indexOf? Patricia after hours of debugging i had an updated code. class Tester { public StringBuffer replace (StringBuffer str, String searchString, String newString) { StringBuffer buffer = new StringBuffer(str.toString()); int start = buffer.toString().indexOf(searchString); int end = start+searchString.length(); return buffer.replace(start, end, newString); } } class MailGenerator { public static void main(String[] args) { Tester test = new Tester(); String st = ("I have exciting * news for you, *!!!. For just $49.99 plus postage"); System.out.println("Original String " +st) ; StringBuffer sb = new StringBuffer(st); System.out.println("replace string " +test.replace(sb,"*", "Occupant")); } } Now the problem is it is just removing the first "*" not the second "*". i know i need to use a for loop so this is what i did. for(int i=0; i<sb.length(); i++) System.out.println("replace string " +test.replace(sb,"*", "Occupant")); Still giving me the same output. Almost there. All you have to do now is to put this logic into a loop. It could be something like that: public StringBuffer replace(StringBuffer str, String searchString, String newString) { StringBuffer buffer = new StringBuffer(str.toString()); int start = 0; while ((start = buffer.indexOf(searchString, start)) != -1) { ... } return buffer; } By the way, why do you create a new StringBuffer instead of modifying the one passed as parameter (str)? Regards > Almost there. All you have to do now is to put this logic into a loop. > It could be something like that: [quoted text clipped - 15 lines] > > Regards Hmm very true. i guess i was going fast and trying to complete this exercise. btw this is not my assignment. just curious to see how stringbuffer things works, Thanks for the hint. actually i did applied the while loop in my method which was something like this. int count=0; while(!count=-1) buffer.replace(start, end, newstring) but my output was not rite. thanks alot Jean. > OMG. This is like my worst nightmare. > class MailGenerator { > public static void main(String[] args) { > String st = ("I have * exciting * news for you, *!!!. For just $49.99 This is like my worst nightmare too. A recurring one, at that. In fact it happened again just now. I was at my b0x and I must have dozed off, because next thing I know I was there again ... everything slow as molasses, you know the feeling like you can try to run but not make any progress, and there was no escape from the zillion form-generated punctuation-laden messages in my inbox offering me stuff for $49.99 and we'll throw in lots of spare exclamation points FREE! I couldn't delete them as fast as new ones came in ... Oh wait, that wasn't a dream, that was me checking my mail, nevermind. Still, I have to wonder why this newsgroup's other participants are helping develop what appears to be spamming software. oh man. you got me really wrong. i am not creating a spamming software or anything lol i dont even know how to make one. dude the class name (mailgenerator) i just creATED. it has nothing to do with spamming or anything lol. i did'nt even realized about that thing. please dont sue me i am not a spammer nor a hacker i am an ordinary programmer and a database developer :) > oh man. you got me really wrong. i am not creating a spamming software > or anything lol i dont even know how to make one. dude the class name > (mailgenerator) i just creATED. it has nothing to do with spamming or > anything lol. i did'nt even realized about that thing. please dont sue > me i am not a spammer nor a hacker i am an ordinary programmer and a > database developer :) <translated to a language even Andrew can understand> Dude. The client gave me the email addresses when I lied and told them I could do this (before crawling in here to try to get others to do it for me) - what do I care where the addresses came from? ..and can you send me the damn codes, already? </translated to a language even Andrew can understand> Andrew T. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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