Using Java change content of text file

Asked May 23 '14 at 08:26

Active May 23 '14 at 08:48

Viewed 93 times

There is a text file like this:

abcd 
1234

and the code I am using :

RandomAccessFile file = null;       
  try {
     file = new RandomAccessFile("C:\\Users\\z36137zz\\Desktop\\test.txt", "rw");
     file.writeBytes("edcba\n");
     file.close();
 } catch (FileNotFoundException e) {
     e.printStackTrace();
 } catch (IOException e) {
     e.printStackTrace();
 }

And I want to change the first line to "edcba", I used the RandomAccessFile Class, but If I write "edcba", it will cover "1" of the second line. So what should I do?

edited May 23 '14 at 08:48

Tejas Kale

asked May 23 '14 at 08:26

huashui

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2

Please append your code so far. – Smutje May 23 '14 at 08:28
The first thing you should do, is show us code. From there we can offer assistance. – tommy knocker May 23 '14 at 08:29
5

You need to read the file, modify the parts you wish, and write the file back out. There's no way to "insert" data without processing the whole file. – Kayaman May 23 '14 at 08:31
I didn't prepare well,I'm sorry. – huashui May 23 '14 at 08:40

Using Java change content of text file

0 Answers0