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Creating a temporary file

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Respected sir, I develop student markList pgm,I dont know how to write the records to file and how to read records from file pls help me. 

Creating two letter temp files
File.createTempFile() dose not support file names less than 3 characters. I want to know why there is such a limitation & how can I create a temp file with a name of less than 3 letters. Regards. 

Thanks so....
I like to improve my java language knowledge... This side is useful... Surely i will come again.. Thanks... 

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