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Java program to read a text file

Posted on 2010-11-30
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Last Modified: 2012-08-14
Please give me the code that reads a text file.
The important thing is that the file could be modified by another program (Python) while the Java program tries to read it. Do I need to use locks? Or is it enough if I use a synchronized function?
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Question by:dshrenik
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10 Comments
 
LVL 12

Expert Comment

by:enachemc
ID: 34236849
you need to use locks
synchonized is used for concurrent acces of threads in the Java Virtual Machine
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Author Comment

by:dshrenik
ID: 34236850
If possible, can u give some sample code? Thanks!
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by:a_b
ID: 34236866
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LVL 92

Expert Comment

by:objects
ID: 34236868
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Author Comment

by:dshrenik
ID: 34236876
So both my Python program and Java program need to use locks?
If yes, will they recognize the locks set by the other program?
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Expert Comment

by:objects
ID: 34236927
you need to use a method that both understand

you can try FileLock, but it is platform dependant
http://www.exampledepot.com/egs/java.nio/SetFileLock.html

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Author Comment

by:dshrenik
ID: 34236940
Suppose I dont use Locks, will I get any errors, or it is just that I wont get the latest values?
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LVL 92

Expert Comment

by:objects
ID: 34236970
generally when you read it you'll whatever the file contains at that point.
depends a bit on the OS though

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Accepted Solution

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objects earned 250 total points
ID: 34236976
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Assisted Solution

by:CEHJ
CEHJ earned 250 total points
ID: 34237511
A file lock probably won't work. Try using a lock file - it will be portable across your different platforms
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