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Thread: to replace a word in file

  1. #1
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    Default to replace a word in file

    I want to replace "integer" with "int" in a file.Following is the code i have written,but its working.Pls let me know my mistake.
    public static void declare(String[] array) throws IOException {
     
    		// TODO Auto-generated method stub
     
    				BufferedWriter b = new BufferedWriter(new FileWriter("F:\\test\\file.txt",true));
    				StringBuffer s = new StringBuffer();
    				String old="integer",newtxt,newt="int";
    				newtxt=old.replace(old, newt);
    				for(int i=0;i<array.length;i++)
    				{
    				s.append(array[i]).append(" ");
    				}
     
     
    				b.write(s.toString());
    			    b.write(newtxt);
    				b.flush();
    				b.close();
     
     
     
    	}


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: to replace a word in file

    What happens when the posted code is executed? Can you post something that shows what it does and add some explanations that say what is wrong and show what you want the output to be.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: to replace a word in file

    The output of the code am getting is
    integer a b int.
    But i want to replace integer with int in output file.

  4. #4
    Member Chris.Brown.SPE's Avatar
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    Default Re: to replace a word in file

    What is the text of the original input file?
    Writing code is your job, helping you fix and understand it is mine.

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    Default Re: to replace a word in file

    I am writing contents of array to a file.Array has "integer" "a" "b".

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    Default Re: to replace a word in file

    I don't think the posted code does anything like what you want:
    Where does the currently posted code read the contents of the file?
    Where does the posted code change anything that could have been read from the file?
    Where does the posted code write out the new contents of the file replacing the old contents of the file?
    If you don't understand my answer, don't ignore it, ask a question.

  7. The Following User Says Thank You to Norm For This Useful Post:

    shenaz (March 21st, 2013)

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    Default Re: to replace a word in file

    Why are you doing the replace before the loop? This should be done in the loop on each array piece as it is added to the string. Get array piece, replace words, add to output. Then at the end just write the string. Newtxt doesnt seem to be needed. That should get you started.
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  9. The Following User Says Thank You to Chris.Brown.SPE For This Useful Post:

    shenaz (March 21st, 2013)

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    Default Re: to replace a word in file

    The code i posted is partial.I din post the code of main function where am reading from one file.I stored the read contents in an array and passed it to a function.I have posted only that function.

  11. #9
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    Default Re: to replace a word in file

    What about my second and third questions?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: to replace a word in file

    Assuming his array is a list of words in the file then my previous post is valid. Just move where you are replacing old with new into the for loop and have it act on the actual array item (not itself for whatever reason it was).
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    Default Re: to replace a word in file

    b.write(s.toString) i used for writing to file. And then b.write(newtxt) for replacing.

    --- Update ---



    --- Update ---

    Thank you.As you told newtxt is not needed.But when i use replace() in for loop it isn't working properly.I used it outside loop instead.It's working.

  14. #12
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    Default Re: to replace a word in file

    Quote Originally Posted by shenaz View Post
    It's working.
    So are we done here or still having a problem?
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  15. #13
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    Default Re: to replace a word in file

    What's in s and what is in newTxt?

    If s is all of the old file's contents and newTxt is "int"
    how does writing those two values one after the other solve your problem?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: to replace a word in file

    No problem.I will mark it as solved.

    --- Update ---

    I deleted writing newtxt to file.Instead after for loop i used s.replace() for replacing old contents with new.And then at once i wrote everything to file.

  17. #15
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    Default Re: to replace a word in file

    Yup, that works. Glad we could help!
    Writing code is your job, helping you fix and understand it is mine.

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  18. #16
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    Default Re: to replace a word in file

    What is in the file if you execute the program more than one time?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: to replace a word in file

    Thank you
    Quote Originally Posted by Chris.Brown.SPE View Post
    Yup, that works. Glad we could help!


    --- Update ---

    File contains algorithm.

  20. #18
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    Default Re: to replace a word in file

    I guess there are things done in other parts of the program that have not been explained. The posted code appends what it writes to the file. It does not replace the contents of the file.
    If you don't understand my answer, don't ignore it, ask a question.

  21. #19
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    Default Re: to replace a word in file

    Ah, your concern is that the file is not being wiped prior to output being printed. Otherwise an input file of "this that integer something else" would turn into "this that integer something elsethis that int something else".
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    Default Re: to replace a word in file

    Ya right.complete code i din't post.it was appending to file but now i changed it.used replace().

    --- Update ---

    Yes yes.So i din use replace() inside loop.

  23. #21
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    Default Re: to replace a word in file

    it was appending to file but now i changed it.used replace().
    What file I/O class has a replace() method?

    If the program deletes the file BEFORE calling the declare() method, then appending to a new file would work.
    If you don't understand my answer, don't ignore it, ask a question.

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