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Java - Deleting the file or Directory


fantastic tutorials im from finland and i study java. Great examples than my country programming books content 

question on java updating a file
i have a file with 3 fields and 10 records. if i want to update 5th record what should i do? do i required to delete the whole file? otherwise how? 

DELETE DIR/FILE from command
i want to delete file in java;the file name should be entered from the user interface .the file with that name should be deleted.what i have realised ,system.in does not allow type file.the name of the file is also stored in the the String format. s 

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