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doubt regarding file handling

abin joy
Ranch Hand

Joined: Jul 29, 2008
Posts: 35
File file=new File("myfile.txt");

file.createNewFile()
file.isDirectory()

Here file.createNewFile() needs a try/catch block or need throws declaration in the method signature to compile where as file.isDirectory() is just fine.I expect file.isDirectory() to behave the same way as file.createNewFile() behaves.Can anyone explain this
Jelle Klap
Bartender

Joined: Mar 10, 2008
Posts: 1756
    
    7

Why would it throw an IOException if no I/O takes place?
The method can throw an unchecked SecurityException, which (obviously) is not subject to the same catch-or-declare requirement as the IOException thrown by the createNewFile() method.


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Nickolas Case
Ranch Hand

Joined: Apr 26, 2008
Posts: 98
file.createNewFile is modifying the file system while file.isDirectory is only checking the status of the file system.
 
It is sorta covered in the JavaRanch Style Guide.
 
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