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How can I change the character in mid of the file

 
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There is a text contaning the following data named "abc.txt".
a b c d e f g h i
j k l m n o p q r
s t u v w x y z
Now I want to change the "n" to "N" in the text file abc.text
I find the position of "n" using the following code.
try {
FileReader readIt = new FileReader("C://abc.txt");
BufferedReader collectData = null;
collectData = new BufferedReader (readIt);
String line= null;
while ((line= collectData.readLine ()) != null) {
if (line.indexOf ('n') > 0) {
/*
Over Here I want to write the code which can change
the letter "n" to letter "N"
*/
} // if
} // while
}catch (Exception ee) {System.out.println (ee);}
 
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Hey. The only thing I can think of right now is to read in the file, chance whatever you want to change, then write your new text (with your change) to the same file. As far as I can tell, that's the only way to do it (correct me if i'm wrong).
Hope this helps.
 
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