i have a LineNumberer program that i wanna know what happens when i supply the name of a nonexistent input file to this program? does it just throw a FileNotFound exception?
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what happens when you supply the same name of a nonexistent input file?
i have a LineNumberer program that i wanna know what happens when i supply the name of a nonexistent input file to this program? does it just throw a FileNotFound exception?
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Re: what happens when you supply the same name of a nonexistent input file?
Not necessarily. Files can hold any file/directory path whether they exist or don't. You can check if a file exists using the exists() method.
File file = new File("garbage.txt"); if (file.exists()) { System.out.println("You have garbage on your computer!"); } else { System.out.println("There is no garbage on your computer!"); }
However, if you try to open up a non-existent file for reading/writing, you will get a FileNotFoundException.
Re: what happens when you supply the same name of a nonexistent input file?
Um, unless you are overwriting an existing file, it's normal to "open" a "nonexistent" file for writing by constructing a FileOutputStream etc. with the non-existent file as argument.
Attempting to open a non-existent file for reading (is with an InputStream) will, as staed, throw an FNFE.
db
Re: what happens when you supply the same name of a nonexistent input file?
What happens when you supply the same name for the input and output files to the LineNumberer program?
just trying to learn about writing data to files
Re: what happens when you supply the same name of a nonexistent input file?
A better way to learn is to just try it and see for yourself, don't you think?
db
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