Some replace methods are ignored [closed]

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I have multiple replace methods (I mean around 200 replace commands all nested in for loops). But some replace methods don't work at all. I am looping through the file using a For loop:

for(i=0; i<file.length; i++) {

but some replace methods are being ignored. Is there a reason why some methods are being ignored and some aren't?

EDIT1: I'm trying to replace multiple strings in a file.

file[i].replace(str1, str2)
file[i].replace(str3, str4)
file[i].replace(str5, str6)
file[i].replace(str7, str8)
file[i].replace(str9, str10)
...
and so on...

Here's the code:

Click here!

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As written, none of the replace statements are doing anything (assuming file is a String[]) because Strings are immutable and replace returns a new String without modifying the original. You'd need to write:

file[i] = file[i].replace(str1, str2);