'try with resource' feature for File class

Question

I have one scenario where I am trying to implement with the Java 7 'try with resource' feature.

My finally block contains an object of BufferedWriter and File, which I want to close using 'try with resource' feature, instead of closing it by calling close method explicitly.

But I checked on net and saw that the File class does not implement the AutoCloseable interface, but BufferedWriter does. So how can I manage this scenario to implement 'try with resource' feature?

Solution 1

 try (BufferedWriter br = new BufferedWriter(new FileWriter(path))) 

Use this simply, br will be closed automatically. Eg. http://www.roseindia.net/java/beginners/java-write-to-file.shtml

Solution 2

You don't need to close a File because it's a pure Java object. It basically just holds the name of the file, nothing else (i.e. it does not require any OS resources to construct).

You only need to close your BufferedWriter and that is correctly AutocCloseable.

Comments

[milind]

So here you are saying that instead of creating a File object, I should directly pass the path of the file to the FileReader constructor and bypass the creation of File object.Right?

[Vineet Singla]

Yes, Absolutely, FileWriter provides a constructor like public FileWriter(String fileName)throws IOException Constructs a FileWriter object given a file name.

[milind]

How this will help. Are you saying here that if I create the File object the way you have specified then when the control moves out of the try block BufferedWriter, FileWriter as well as File will automatically be closed?

[Vineet Singla]

See , this sample code :roseindia.net/java/beginners/java-write-to-file.shtml

[Joachim Sauer]

@milind: you can still use a File object, if you wish. You don't need to close that at all!

[Joachim Sauer]

@milind: then please don't forget to upvote any answer that helped you solve it and accept the one that helped most.

[milind]

@ Joachim Sauer Ya thanks for reminding. I have upvoted on of the answer that helped me

[Broken_Window]

I was about to ask if a File object would left an opened file handle :)