How to read updated data from a real-time generated file?

I have a question:
I want to read the 10 mostly updated data from a real time generated data file. The data in this file is accumulated. how can i read mostly recently data to an applet? and further to using this data to draw a real-time graph? pls help
kelvin t.l. tse

Hi,
I think there is no "typical" way. You will have to define a convention on how the new data are stored into the file, so as to know how to accessthem. If new data are simply put at theend of your file, you may use a RandomAccessFile to read only those lines that interest you (the 1 final lines).Otherwise, you should at least know how the data file is written.
You can know if thedata file has been modified with the File.lastModified() method. This retrurns a long value corresponding to the date and hour the file was last modified. Store that value ito you appl. and perdiodically (use a Thread), compare that value with the value returned by lastModief(). If both value are NOt equal, then the file has been updated
it's all a question of knowing how the data are stored into the datafie generated.
Be also aware that you will probably have problem when your java appl. tries to read the file at the same time it is updated by the other application. I guess when theother application writes data into the file, you will not be able to read it. So, use try{} catch statements and first check to see if you can read the file with File. canRead(). If not, simply delay the reading process by asking a Thread.yield() or Thread.delay (1000)...
vincent

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