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checking if a file exists.

Posted on 2004-10-25
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Last Modified: 2010-04-01
I want to be able to do a check to see if a file exists and if it does i want to append something to
the end of the file, otherwise I want to create a new file.

so for example, if the file exists in the given directory and there is something written in it.  I want to be able to check the first word and do a comparison on it with a string in my code.

/test/test.txt

just append something to it, otherwise i want to create a new one.
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Question by:pronane
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4 Comments
 
LVL 35

Expert Comment

by:TimYates
ID: 12399596
FileWriter( "/test/test.txt", true ) ;

will create the file if it doesn't exist (or append to it if it does)

To read the first line out of the file, you will need to use

BufferedReader br = new BufferedReader( new FileReader( "/test/test.txt" ) ) ;
String line = br.readLine() ;
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LVL 35

Expert Comment

by:TimYates
ID: 12399962
Oh, and to check if a file exists, do:

  boolean exists = new File( "/test/test.txt" ).exists() ;
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Author Comment

by:pronane
ID: 12400168
ya i figured it out already myself

i have file f = new file(name)
if f.exists()
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TimYates earned 150 total points
ID: 12400183
yup
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