[Okta Webinar] Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

Java - code to ignore if file exists

Posted on 2013-06-04
5
Medium Priority
?
339 Views
Last Modified: 2013-06-04
HI:
I have a java app which takes a file from directory a, manipulates it, and copies the finished file to directory b. Works nicely, too - unless the file already exists. In that event the contents of the destination file are doubled up - an append, if you like.
Is there a java way of saying "if destination file already exists, do nothing; else do some code"
I enclose copies of my java code filesplitter.txt (yes I am a novice!), the source file (added 's' at end of number) and the destination file ('d'). If I run the code then the size of destination file will double - I need it only once.
Thanks!
182277s.txt
filesplitter.txt
182277d.txt
0
Comment
Question by:ClaytonGlass
  • 2
  • 2
5 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 39218567
0
 

Author Comment

by:ClaytonGlass
ID: 39218626
Thanks CEHJ but I am not sure where to put the code. The app creates the file during a while loop; inserting the file.exists() in the loop simply truncates the loop. I am guessing that I need to run my file.exists() outside the loop - which suggest I need to duplicate the naming process earlier. I was hoping there may be an easier way; if anybody knows it...thanks anyway!
0
 
LVL 37

Accepted Solution

by:
zzynx earned 1400 total points
ID: 39218706
Try replacing

 if(fw != null) fw.close();
 fw = new FileWriter(new File("J:\\saw\\"+curFile+ ".saw"), true);

Open in new window

by

 if(fw != null) fw.close();
 File outputFile = new File("J:\\saw\\"+curFile+ ".saw");
 if (!outputFile.exists()) {
   fw = new FileWriter(outputFile, true);
 }

Open in new window

0
 

Author Closing Comment

by:ClaytonGlass
ID: 39218745
Thanks you very much! and CEHJ, too!
0
 
LVL 37

Expert Comment

by:zzynx
ID: 39218859
You're welcome.
Thanx 4 axxepting
0

Featured Post

Upgrade your Question Security!

Add Premium security features to your question to ensure its privacy or anonymity. Learn more about your ability to control Question Security today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.
Suggested Courses
Course of the Month19 days, 17 hours left to enroll

872 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question